Merge branch 'topic/usb-audio-refactoring' into for-next

Pull the USB audio improvement

Signed-off-by: Takashi Iwai <tiwai@suse.de>

54 files changed, 2077 insertions, 1543 deletions

diff --git a/sound/core/control.c b/sound/core/control.c
index 4373de42a5a0..3b44378b9dec 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1539,7 +1539,7 @@ static int snd_ctl_elem_add(struct snd_ctl_file *file,
 
  unlock:
 	up_write(&card->controls_rwsem);
-	return 0;
+	return err;
 }
 
 static int snd_ctl_elem_add_user(struct snd_ctl_file *file,
diff --git a/sound/firewire/fireworks/fireworks_transaction.c b/sound/firewire/fireworks/fireworks_transaction.c
index 0f533f5bd960..9f8c53b39f95 100644
--- a/sound/firewire/fireworks/fireworks_transaction.c
+++ b/sound/firewire/fireworks/fireworks_transaction.c
@@ -123,7 +123,7 @@ copy_resp_to_buf(struct snd_efw *efw, void *data, size_t length, int *rcode)
 	t = (struct snd_efw_transaction *)data;
 	length = min_t(size_t, be32_to_cpu(t->length) * sizeof(u32), length);
 
-	spin_lock_irq(&efw->lock);
+	spin_lock(&efw->lock);
 
 	if (efw->push_ptr < efw->pull_ptr)
 		capacity = (unsigned int)(efw->pull_ptr - efw->push_ptr);
@@ -190,7 +190,7 @@ handle_resp_for_user(struct fw_card *card, int generation, int source,
 
 	copy_resp_to_buf(efw, data, length, rcode);
 end:
-	spin_unlock_irq(&instances_lock);
+	spin_unlock(&instances_lock);
 }
 
 static void
diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c
index 4d060d5b1db6..b0c0ef824d7d 100644
--- a/sound/hda/ext/hdac_ext_controller.c
+++ b/sound/hda/ext/hdac_ext_controller.c
@@ -148,6 +148,8 @@ struct hdac_ext_link *snd_hdac_ext_bus_get_link(struct hdac_bus *bus,
 		return NULL;
 	if (bus->idx != bus_idx)
 		return NULL;
+	if (addr < 0 || addr > 31)
+		return NULL;
 
 	list_for_each_entry(hlink, &bus->hlink_list, list) {
 		for (i = 0; i < HDA_MAX_CODECS; i++) {
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index a356c21edb90..4bb58e8b08a8 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2934,7 +2934,7 @@ static void hda_call_codec_resume(struct hda_codec *codec)
 	snd_hdac_leave_pm(&codec->core);
 }
 
-static int hda_codec_runtime_suspend(struct device *dev)
+static int hda_codec_suspend(struct device *dev)
 {
 	struct hda_codec *codec = dev_to_hda_codec(dev);
 	unsigned int state;
@@ -2953,7 +2953,7 @@ static int hda_codec_runtime_suspend(struct device *dev)
 	return 0;
 }
 
-static int hda_codec_runtime_resume(struct device *dev)
+static int hda_codec_resume(struct device *dev)
 {
 	struct hda_codec *codec = dev_to_hda_codec(dev);
 
@@ -2967,57 +2967,70 @@ static int hda_codec_runtime_resume(struct device *dev)
 	pm_runtime_mark_last_busy(dev);
 	return 0;
 }
+
+static int hda_codec_runtime_suspend(struct device *dev)
+{
+	return hda_codec_suspend(dev);
+}
+
+static int hda_codec_runtime_resume(struct device *dev)
+{
+	return hda_codec_resume(dev);
+}
+
 #endif /* CONFIG_PM */
 
 #ifdef CONFIG_PM_SLEEP
-static int hda_codec_force_resume(struct device *dev)
+static int hda_codec_pm_prepare(struct device *dev)
+{
+	return pm_runtime_suspended(dev);
+}
+
+static void hda_codec_pm_complete(struct device *dev)
 {
 	struct hda_codec *codec = dev_to_hda_codec(dev);
-	int ret;
 
-	ret = pm_runtime_force_resume(dev);
-	/* schedule jackpoll work for jack detection update */
-	if (codec->jackpoll_interval ||
-	    (pm_runtime_suspended(dev) && hda_codec_need_resume(codec)))
-		schedule_delayed_work(&codec->jackpoll_work,
-				      codec->jackpoll_interval);
-	return ret;
+	if (pm_runtime_suspended(dev) && (codec->jackpoll_interval ||
+	    hda_codec_need_resume(codec) || codec->forced_resume))
+		pm_request_resume(dev);
 }
 
 static int hda_codec_pm_suspend(struct device *dev)
 {
 	dev->power.power_state = PMSG_SUSPEND;
-	return pm_runtime_force_suspend(dev);
+	return hda_codec_suspend(dev);
 }
 
 static int hda_codec_pm_resume(struct device *dev)
 {
 	dev->power.power_state = PMSG_RESUME;
-	return hda_codec_force_resume(dev);
+	return hda_codec_resume(dev);
 }
 
 static int hda_codec_pm_freeze(struct device *dev)
 {
 	dev->power.power_state = PMSG_FREEZE;
-	return pm_runtime_force_suspend(dev);
+	return hda_codec_suspend(dev);
 }
 
 static int hda_codec_pm_thaw(struct device *dev)
 {
 	dev->power.power_state = PMSG_THAW;
-	return hda_codec_force_resume(dev);
+	return hda_codec_resume(dev);
 }
 
 static int hda_codec_pm_restore(struct device *dev)
 {
 	dev->power.power_state = PMSG_RESTORE;
-	return hda_codec_force_resume(dev);
+	return hda_codec_resume(dev);
 }
 #endif /* CONFIG_PM_SLEEP */
 
 /* referred in hda_bind.c */
 const struct dev_pm_ops hda_codec_driver_pm = {
 #ifdef CONFIG_PM_SLEEP
+	.prepare = hda_codec_pm_prepare,
+	.complete = hda_codec_pm_complete,
 	.suspend = hda_codec_pm_suspend,
 	.resume = hda_codec_pm_resume,
 	.freeze = hda_codec_pm_freeze,
diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
index be63ead8161f..68f9668788ea 100644
--- a/sound/pci/hda/hda_controller.h
+++ b/sound/pci/hda/hda_controller.h
@@ -41,7 +41,7 @@
 /* 24 unused */
 #define AZX_DCAPS_COUNT_LPIB_DELAY  (1 << 25)	/* Take LPIB as delay */
 #define AZX_DCAPS_PM_RUNTIME	(1 << 26)	/* runtime PM support */
-#define AZX_DCAPS_SUSPEND_SPURIOUS_WAKEUP (1 << 27) /* Workaround for spurious wakeups after suspend */
+/* 27 unused */
 #define AZX_DCAPS_CORBRP_SELF_CLEAR (1 << 28)	/* CORBRP clears itself after reset */
 #define AZX_DCAPS_NO_MSI64      (1 << 29)	/* Stick to 32-bit MSIs */
 #define AZX_DCAPS_SEPARATE_STREAM_TAG	(1 << 30) /* capture and playback use separate stream tag */
@@ -143,6 +143,7 @@ struct azx {
 	unsigned int align_buffer_size:1;
 	unsigned int region_requested:1;
 	unsigned int disabled:1; /* disabled by vga_switcheroo */
+	unsigned int pm_prepared:1;
 
 	/* GTS present */
 	unsigned int gts_present:1;
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 749b88090970..6852668f1bcb 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -297,8 +297,7 @@ enum {
 /* PCH for HSW/BDW; with runtime PM */
 /* no i915 binding for this as HSW/BDW has another controller for HDMI */
 #define AZX_DCAPS_INTEL_PCH \
-	(AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_PM_RUNTIME |\
-	 AZX_DCAPS_SUSPEND_SPURIOUS_WAKEUP)
+	(AZX_DCAPS_INTEL_PCH_BASE | AZX_DCAPS_PM_RUNTIME)
 
 /* HSW HDMI */
 #define AZX_DCAPS_INTEL_HASWELL \
@@ -985,7 +984,7 @@ static void __azx_runtime_suspend(struct azx *chip)
 	display_power(chip, false);
 }
 
-static void __azx_runtime_resume(struct azx *chip, bool from_rt)
+static void __azx_runtime_resume(struct azx *chip)
 {
 	struct hda_intel *hda = container_of(chip, struct hda_intel, chip);
 	struct hdac_bus *bus = azx_bus(chip);
@@ -1002,7 +1001,8 @@ static void __azx_runtime_resume(struct azx *chip, bool from_rt)
 	azx_init_pci(chip);
 	hda_intel_init_chip(chip, true);
 
-	if (from_rt) {
+	/* Avoid codec resume if runtime resume is for system suspend */
+	if (!chip->pm_prepared) {
 		list_for_each_codec(codec, &chip->bus) {
 			if (codec->relaxed_resume)
 				continue;
@@ -1018,6 +1018,29 @@ static void __azx_runtime_resume(struct azx *chip, bool from_rt)
 }
 
 #ifdef CONFIG_PM_SLEEP
+static int azx_prepare(struct device *dev)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct azx *chip;
+
+	chip = card->private_data;
+	chip->pm_prepared = 1;
+
+	/* HDA controller always requires different WAKEEN for runtime suspend
+	 * and system suspend, so don't use direct-complete here.
+	 */
+	return 0;
+}
+
+static void azx_complete(struct device *dev)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct azx *chip;
+
+	chip = card->private_data;
+	chip->pm_prepared = 0;
+}
+
 static int azx_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
@@ -1029,15 +1052,7 @@ static int azx_suspend(struct device *dev)
 
 	chip = card->private_data;
 	bus = azx_bus(chip);
-	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
-	/* An ugly workaround: direct call of __azx_runtime_suspend() and
-	 * __azx_runtime_resume() for old Intel platforms that suffer from
-	 * spurious wakeups after S3 suspend
-	 */
-	if (chip->driver_caps & AZX_DCAPS_SUSPEND_SPURIOUS_WAKEUP)
-		__azx_runtime_suspend(chip);
-	else
-		pm_runtime_force_suspend(dev);
+	__azx_runtime_suspend(chip);
 	if (bus->irq >= 0) {
 		free_irq(bus->irq, chip);
 		bus->irq = -1;
@@ -1066,11 +1081,7 @@ static int azx_resume(struct device *dev)
 	if (azx_acquire_irq(chip, 1) < 0)
 		return -EIO;
 
-	if (chip->driver_caps & AZX_DCAPS_SUSPEND_SPURIOUS_WAKEUP)
-		__azx_runtime_resume(chip, false);
-	else
-		pm_runtime_force_resume(dev);
-	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+	__azx_runtime_resume(chip);
 
 	trace_azx_resume(chip);
 	return 0;
@@ -1118,10 +1129,7 @@ static int azx_runtime_suspend(struct device *dev)
 	chip = card->private_data;
 
 	/* enable controller wake up event */
-	if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0) {
-		azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) |
-			   STATESTS_INT_MASK);
-	}
+	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) | STATESTS_INT_MASK);
 
 	__azx_runtime_suspend(chip);
 	trace_azx_runtime_suspend(chip);
@@ -1132,18 +1140,14 @@ static int azx_runtime_resume(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
-	bool from_rt = snd_power_get_state(card) == SNDRV_CTL_POWER_D0;
 
 	if (!azx_is_pm_ready(card))
 		return 0;
 	chip = card->private_data;
-	__azx_runtime_resume(chip, from_rt);
+	__azx_runtime_resume(chip);
 
 	/* disable controller Wake Up event*/
-	if (from_rt) {
-		azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) &
-			   ~STATESTS_INT_MASK);
-	}
+	azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) & ~STATESTS_INT_MASK);
 
 	trace_azx_runtime_resume(chip);
 	return 0;
@@ -1177,6 +1181,8 @@ static int azx_runtime_idle(struct device *dev)
 static const struct dev_pm_ops azx_pm = {
 	SET_SYSTEM_SLEEP_PM_OPS(azx_suspend, azx_resume)
 #ifdef CONFIG_PM_SLEEP
+	.prepare = azx_prepare,
+	.complete = azx_complete,
 	.freeze_noirq = azx_freeze_noirq,
 	.thaw_noirq = azx_thaw_noirq,
 #endif
@@ -2356,6 +2362,7 @@ static int azx_probe_continue(struct azx *chip)
 
 	if (azx_has_pm_runtime(chip)) {
 		pm_runtime_use_autosuspend(&pci->dev);
+		pm_runtime_allow(&pci->dev);
 		pm_runtime_put_autosuspend(&pci->dev);
 	}
 
@@ -2499,6 +2506,9 @@ static const struct pci_device_id azx_ids[] = {
 	/* DG1 */
 	{ PCI_DEVICE(0x8086, 0x490d),
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
+	/* Alderlake-S */
+	{ PCI_DEVICE(0x8086, 0x7ad0),
+	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
 	/* Elkhart Lake */
 	{ PCI_DEVICE(0x8086, 0x4b55),
 	  .driver_data = AZX_DRIVER_SKL | AZX_DCAPS_INTEL_SKYLAKE},
diff --git a/sound/pci/hda/patch_ca0132.c b/sound/pci/hda/patch_ca0132.c
index e0c38f2735c6..d8370a417e3d 100644
--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -9183,6 +9183,8 @@ static void ca0132_mmio_init(struct hda_codec *codec)
 	case QUIRK_AE5:
 		ca0132_mmio_init_ae5(codec);
 		break;
+	default:
+		break;
 	}
 }
 
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index ccd1df059654..b0068f8ca46d 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -4274,6 +4274,7 @@ HDA_CODEC_ENTRY(0x8086280d, "Geminilake HDMI",	patch_i915_glk_hdmi),
 HDA_CODEC_ENTRY(0x8086280f, "Icelake HDMI",	patch_i915_icl_hdmi),
 HDA_CODEC_ENTRY(0x80862812, "Tigerlake HDMI",	patch_i915_tgl_hdmi),
 HDA_CODEC_ENTRY(0x80862814, "DG1 HDMI",	patch_i915_tgl_hdmi),
+HDA_CODEC_ENTRY(0x80862815, "Alderlake HDMI",	patch_i915_tgl_hdmi),
 HDA_CODEC_ENTRY(0x80862816, "Rocketlake HDMI",	patch_i915_tgl_hdmi),
 HDA_CODEC_ENTRY(0x8086281a, "Jasperlake HDMI",	patch_i915_icl_hdmi),
 HDA_CODEC_ENTRY(0x8086281b, "Elkhartlake HDMI",	patch_i915_icl_hdmi),
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index f2398721ac1e..739dbaf54517 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -2522,13 +2522,23 @@ static const struct snd_pci_quirk alc882_fixup_tbl[] = {
 	SND_PCI_QUIRK_VENDOR(0x1462, "MSI", ALC882_FIXUP_GPIO3),
 	SND_PCI_QUIRK(0x147b, 0x107a, "Abit AW9D-MAX", ALC882_FIXUP_ABIT_AW9D_MAX),
 	SND_PCI_QUIRK(0x1558, 0x9501, "Clevo P950HR", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x9506, "Clevo P955HQ", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x950A, "Clevo P955H[PR]", ALC1220_FIXUP_CLEVO_P950),
 	SND_PCI_QUIRK(0x1558, 0x95e1, "Clevo P95xER", ALC1220_FIXUP_CLEVO_P950),
 	SND_PCI_QUIRK(0x1558, 0x95e2, "Clevo P950ER", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x95e3, "Clevo P955[ER]T", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x95e4, "Clevo P955ER", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x95e5, "Clevo P955EE6", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x95e6, "Clevo P950R[CDF]", ALC1220_FIXUP_CLEVO_P950),
 	SND_PCI_QUIRK(0x1558, 0x96e1, "Clevo P960[ER][CDFN]-K", ALC1220_FIXUP_CLEVO_P950),
 	SND_PCI_QUIRK(0x1558, 0x97e1, "Clevo P970[ER][CDFN]", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x97e2, "Clevo P970RC-M", ALC1220_FIXUP_CLEVO_P950),
+	SND_PCI_QUIRK(0x1558, 0x50d3, "Clevo PC50[ER][CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
 	SND_PCI_QUIRK(0x1558, 0x65d1, "Clevo PB51[ER][CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
+	SND_PCI_QUIRK(0x1558, 0x65d2, "Clevo PB51R[CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
+	SND_PCI_QUIRK(0x1558, 0x65e1, "Clevo PB51[ED][DF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
 	SND_PCI_QUIRK(0x1558, 0x67d1, "Clevo PB71[ER][CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
-	SND_PCI_QUIRK(0x1558, 0x50d3, "Clevo PC50[ER][CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
+	SND_PCI_QUIRK(0x1558, 0x67e1, "Clevo PB71[DE][CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
 	SND_PCI_QUIRK(0x1558, 0x70d1, "Clevo PC70[ER][CDF]", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
 	SND_PCI_QUIRK(0x1558, 0x7714, "Clevo X170", ALC1220_FIXUP_CLEVO_PB51ED_PINS),
 	SND_PCI_QUIRK_VENDOR(0x1558, "Clevo laptop", ALC882_FIXUP_EAPD),
@@ -4216,6 +4226,12 @@ static void alc286_fixup_hp_gpio_led(struct hda_codec *codec,
 	alc_fixup_hp_gpio_led(codec, action, 0x02, 0x20);
 }
 
+static void alc287_fixup_hp_gpio_led(struct hda_codec *codec,
+				const struct hda_fixup *fix, int action)
+{
+	alc_fixup_hp_gpio_led(codec, action, 0x10, 0);
+}
+
 /* turn on/off mic-mute LED per capture hook via VREF change */
 static int vref_micmute_led_set(struct led_classdev *led_cdev,
 				enum led_brightness brightness)
@@ -6008,6 +6024,27 @@ static void alc285_fixup_invalidate_dacs(struct hda_codec *codec,
 	snd_hda_override_wcaps(codec, 0x03, 0);
 }
 
+static void alc_combo_jack_hp_jd_restart(struct hda_codec *codec)
+{
+	switch (codec->core.vendor_id) {
+	case 0x10ec0274:
+	case 0x10ec0294:
+	case 0x10ec0225:
+	case 0x10ec0295:
+	case 0x10ec0299:
+		alc_update_coef_idx(codec, 0x4a, 0x8000, 1 << 15); /* Reset HP JD */
+		alc_update_coef_idx(codec, 0x4a, 0x8000, 0 << 15);
+		break;
+	case 0x10ec0235:
+	case 0x10ec0236:
+	case 0x10ec0255:
+	case 0x10ec0256:
+		alc_update_coef_idx(codec, 0x1b, 0x8000, 1 << 15); /* Reset HP JD */
+		alc_update_coef_idx(codec, 0x1b, 0x8000, 0 << 15);
+		break;
+	}
+}
+
 static void alc295_fixup_chromebook(struct hda_codec *codec,
 				    const struct hda_fixup *fix, int action)
 {
@@ -6018,16 +6055,7 @@ static void alc295_fixup_chromebook(struct hda_codec *codec,
 		spec->ultra_low_power = true;
 		break;
 	case HDA_FIXUP_ACT_INIT:
-		switch (codec->core.vendor_id) {
-		case 0x10ec0295:
-			alc_update_coef_idx(codec, 0x4a, 0x8000, 1 << 15); /* Reset HP JD */
-			alc_update_coef_idx(codec, 0x4a, 0x8000, 0 << 15);
-			break;
-		case 0x10ec0236:
-			alc_update_coef_idx(codec, 0x1b, 0x8000, 1 << 15); /* Reset HP JD */
-			alc_update_coef_idx(codec, 0x1b, 0x8000, 0 << 15);
-			break;
-		}
+		alc_combo_jack_hp_jd_restart(codec);
 		break;
 	}
 }
@@ -6083,6 +6111,16 @@ static void  alc285_fixup_hp_gpio_amp_init(struct hda_codec *codec,
 	alc_write_coef_idx(codec, 0x65, 0x0);
 }
 
+static void alc274_fixup_hp_headset_mic(struct hda_codec *codec,
+				    const struct hda_fixup *fix, int action)
+{
+	switch (action) {
+	case HDA_FIXUP_ACT_INIT:
+		alc_combo_jack_hp_jd_restart(codec);
+		break;
+	}
+}
+
 /* for hda_fixup_thinkpad_acpi() */
 #include "thinkpad_helper.c"
 
@@ -6277,6 +6315,11 @@ enum {
 	ALC256_FIXUP_INTEL_NUC8_RUGGED,
 	ALC255_FIXUP_XIAOMI_HEADSET_MIC,
 	ALC274_FIXUP_HP_MIC,
+	ALC274_FIXUP_HP_HEADSET_MIC,
+	ALC256_FIXUP_ASUS_HPE,
+	ALC285_FIXUP_THINKPAD_NO_BASS_SPK_HEADSET_JACK,
+	ALC287_FIXUP_HP_GPIO_LED,
+	ALC256_FIXUP_HP_HEADSET_MIC,
 };
 
 static const struct hda_fixup alc269_fixups[] = {
@@ -7664,6 +7707,37 @@ static const struct hda_fixup alc269_fixups[] = {
 			{ }
 		},
 	},
+	[ALC274_FIXUP_HP_HEADSET_MIC] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc274_fixup_hp_headset_mic,
+		.chained = true,
+		.chain_id = ALC274_FIXUP_HP_MIC
+	},
+	[ALC256_FIXUP_ASUS_HPE] = {
+		.type = HDA_FIXUP_VERBS,
+		.v.verbs = (const struct hda_verb[]) {
+			/* Set EAPD high */
+			{ 0x20, AC_VERB_SET_COEF_INDEX, 0x0f },
+			{ 0x20, AC_VERB_SET_PROC_COEF, 0x7778 },
+			{ }
+		},
+		.chained = true,
+		.chain_id = ALC294_FIXUP_ASUS_HEADSET_MIC
+	},
+	[ALC285_FIXUP_THINKPAD_NO_BASS_SPK_HEADSET_JACK] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc_fixup_headset_jack,
+		.chained = true,
+		.chain_id = ALC269_FIXUP_THINKPAD_ACPI
+	},
+	[ALC287_FIXUP_HP_GPIO_LED] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc287_fixup_hp_gpio_led,
+	},
+	[ALC256_FIXUP_HP_HEADSET_MIC] = {
+		.type = HDA_FIXUP_FUNC,
+		.v.func = alc274_fixup_hp_headset_mic,
+	},
 };
 
 static const struct snd_pci_quirk alc269_fixup_tbl[] = {
@@ -7815,10 +7889,11 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x103c, 0x869d, "HP", ALC236_FIXUP_HP_MUTE_LED),
 	SND_PCI_QUIRK(0x103c, 0x8729, "HP", ALC285_FIXUP_HP_GPIO_LED),
 	SND_PCI_QUIRK(0x103c, 0x8736, "HP", ALC285_FIXUP_HP_GPIO_AMP_INIT),
-	SND_PCI_QUIRK(0x103c, 0x874e, "HP", ALC274_FIXUP_HP_MIC),
 	SND_PCI_QUIRK(0x103c, 0x8760, "HP", ALC285_FIXUP_HP_MUTE_LED),
 	SND_PCI_QUIRK(0x103c, 0x877a, "HP", ALC285_FIXUP_HP_MUTE_LED),
 	SND_PCI_QUIRK(0x103c, 0x877d, "HP", ALC236_FIXUP_HP_MUTE_LED),
+	SND_PCI_QUIRK(0x103c, 0x87f4, "HP", ALC287_FIXUP_HP_GPIO_LED),
+	SND_PCI_QUIRK(0x103c, 0x87f5, "HP", ALC287_FIXUP_HP_GPIO_LED),
 	SND_PCI_QUIRK(0x1043, 0x103e, "ASUS X540SA", ALC256_FIXUP_ASUS_MIC),
 	SND_PCI_QUIRK(0x1043, 0x103f, "ASUS TX300", ALC282_FIXUP_ASUS_TX300),
 	SND_PCI_QUIRK(0x1043, 0x106d, "Asus K53BE", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
@@ -7848,6 +7923,7 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x1043, 0x1bbd, "ASUS Z550MA", ALC255_FIXUP_ASUS_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1043, 0x1c23, "Asus X55U", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
 	SND_PCI_QUIRK(0x1043, 0x1ccd, "ASUS X555UB", ALC256_FIXUP_ASUS_MIC),
+	SND_PCI_QUIRK(0x1043, 0x1d4e, "ASUS TM420", ALC256_FIXUP_ASUS_HPE),
 	SND_PCI_QUIRK(0x1043, 0x1e11, "ASUS Zephyrus G15", ALC289_FIXUP_ASUS_GA502),
 	SND_PCI_QUIRK(0x1043, 0x1f11, "ASUS Zephyrus G14", ALC289_FIXUP_ASUS_GA401),
 	SND_PCI_QUIRK(0x1043, 0x1881, "ASUS Zephyrus S/M", ALC294_FIXUP_ASUS_GX502_PINS),
@@ -7883,11 +7959,49 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x1458, 0xfa53, "Gigabyte BXBT-2807", ALC283_FIXUP_HEADSET_MIC),
 	SND_PCI_QUIRK(0x1462, 0xb120, "MSI Cubi MS-B120", ALC283_FIXUP_HEADSET_MIC),
 	SND_PCI_QUIRK(0x1462, 0xb171, "Cubi N 8GL (MS-B171)", ALC283_FIXUP_HEADSET_MIC),
+	SND_PCI_QUIRK(0x1558, 0x1323, "Clevo N130ZU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1558, 0x1325, "System76 Darter Pro (darp5)", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x1401, "Clevo L140[CZ]U", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x1403, "Clevo N140CU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x1404, "Clevo N150CU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x14a1, "Clevo L141MU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x4018, "Clevo NV40M[BE]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x4019, "Clevo NV40MZ", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x4020, "Clevo NV40MB", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x40a1, "Clevo NL40GU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x40c1, "Clevo NL40[CZ]U", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x40d1, "Clevo NL41DU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50a3, "Clevo NJ51GU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50b3, "Clevo NK50S[BEZ]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50b6, "Clevo NK50S5", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50b8, "Clevo NK50SZ", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50d5, "Clevo NP50D5", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50f0, "Clevo NH50A[CDF]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x50f3, "Clevo NH58DPQ", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x5101, "Clevo S510WU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x5157, "Clevo W517GU1", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x51a1, "Clevo NS50MU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x70a1, "Clevo NB70T[HJK]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x70b3, "Clevo NK70SB", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8228, "Clevo NR40BU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8520, "Clevo NH50D[CD]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8521, "Clevo NH77D[CD]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8535, "Clevo NH50D[BE]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8536, "Clevo NH79D[BE]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1558, 0x8550, "System76 Gazelle (gaze14)", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1558, 0x8551, "System76 Gazelle (gaze14)", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x1558, 0x8560, "System76 Gazelle (gaze14)", ALC269_FIXUP_HEADSET_MIC),
 	SND_PCI_QUIRK(0x1558, 0x8561, "System76 Gazelle (gaze14)", ALC269_FIXUP_HEADSET_MIC),
+	SND_PCI_QUIRK(0x1558, 0x8668, "Clevo NP50B[BE]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8680, "Clevo NJ50LU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8686, "Clevo NH50[CZ]U", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8a20, "Clevo NH55DCQ-Y", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8a51, "Clevo NH70RCQ-Y", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x8d50, "Clevo NH55RCQ-M", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x951d, "Clevo N950T[CDF]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x961d, "Clevo N960S[CDF]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0x971d, "Clevo N970T[CDF]", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
+	SND_PCI_QUIRK(0x1558, 0xa500, "Clevo NL53RU", ALC293_FIXUP_SYSTEM76_MIC_NO_PRESENCE),
 	SND_PCI_QUIRK(0x17aa, 0x1036, "Lenovo P520", ALC233_FIXUP_LENOVO_MULTI_CODECS),
 	SND_PCI_QUIRK(0x17aa, 0x1048, "ThinkCentre Station", ALC283_FIXUP_HEADSET_MIC),
 	SND_PCI_QUIRK(0x17aa, 0x20f2, "Thinkpad SL410/510", ALC269_FIXUP_SKU_IGNORE),
@@ -7925,6 +8039,8 @@ static const struct snd_pci_quirk alc269_fixup_tbl[] = {
 	SND_PCI_QUIRK(0x17aa, 0x225d, "Thinkpad T480", ALC269_FIXUP_LIMIT_INT_MIC_BOOST),
 	SND_PCI_QUIRK(0x17aa, 0x2292, "Thinkpad X1 Carbon 7th", ALC285_FIXUP_THINKPAD_HEADSET_JACK),
 	SND_PCI_QUIRK(0x17aa, 0x22be, "Thinkpad X1 Carbon 8th", ALC285_FIXUP_THINKPAD_HEADSET_JACK),
+	SND_PCI_QUIRK(0x17aa, 0x22c1, "Thinkpad P1 Gen 3", ALC285_FIXUP_THINKPAD_NO_BASS_SPK_HEADSET_JACK),
+	SND_PCI_QUIRK(0x17aa, 0x22c2, "Thinkpad X1 Extreme Gen 3", ALC285_FIXUP_THINKPAD_NO_BASS_SPK_HEADSET_JACK),
 	SND_PCI_QUIRK(0x17aa, 0x30bb, "ThinkCentre AIO", ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY),
 	SND_PCI_QUIRK(0x17aa, 0x30e2, "ThinkCentre AIO", ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY),
 	SND_PCI_QUIRK(0x17aa, 0x310c, "ThinkCentre Station", ALC294_FIXUP_LENOVO_MIC_LOCATION),
@@ -8237,6 +8353,10 @@ static const struct snd_hda_pin_quirk alc269_pin_fixup_tbl[] = {
 		{0x19, 0x02a11020},
 		{0x1a, 0x02a11030},
 		{0x21, 0x0221101f}),
+	SND_HDA_PIN_QUIRK(0x10ec0236, 0x103c, "HP", ALC256_FIXUP_HP_HEADSET_MIC,
+		{0x14, 0x90170110},
+		{0x19, 0x02a11020},
+		{0x21, 0x02211030}),
 	SND_HDA_PIN_QUIRK(0x10ec0255, 0x1028, "Dell", ALC255_FIXUP_DELL2_MIC_NO_PRESENCE,
 		{0x14, 0x90170110},
 		{0x21, 0x02211020}),
@@ -8339,6 +8459,14 @@ static const struct snd_hda_pin_quirk alc269_pin_fixup_tbl[] = {
 		{0x1a, 0x90a70130},
 		{0x1b, 0x90170110},
 		{0x21, 0x03211020}),
+       SND_HDA_PIN_QUIRK(0x10ec0256, 0x103c, "HP", ALC256_FIXUP_HP_HEADSET_MIC,
+		{0x14, 0x90170110},
+		{0x19, 0x02a11020},
+		{0x21, 0x0221101f}),
+       SND_HDA_PIN_QUIRK(0x10ec0274, 0x103c, "HP", ALC274_FIXUP_HP_HEADSET_MIC,
+		{0x17, 0x90170110},
+		{0x19, 0x03a11030},
+		{0x21, 0x03211020}),
 	SND_HDA_PIN_QUIRK(0x10ec0280, 0x103c, "HP", ALC280_FIXUP_HP_GPIO4,
 		{0x12, 0x90a60130},
 		{0x14, 0x90170110},
diff --git a/sound/pci/mixart/mixart_core.c b/sound/pci/mixart/mixart_core.c
index 0bdd33b0af65..fb8895af0363 100644
--- a/sound/pci/mixart/mixart_core.c
+++ b/sound/pci/mixart/mixart_core.c
@@ -70,7 +70,6 @@ static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
 	unsigned int i;
 #endif
 
-	mutex_lock(&mgr->msg_lock);
 	err = 0;
 
 	/* copy message descriptor from miXart to driver */
@@ -119,8 +118,6 @@ static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
 	writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
 
  _clean_exit:
-	mutex_unlock(&mgr->msg_lock);
-
 	return err;
 }
 
@@ -258,7 +255,9 @@ int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int
 	resp.data = resp_data;
 	resp.size = max_resp_size;
 
+	mutex_lock(&mgr->msg_lock);
 	err = get_msg(mgr, &resp, msg_frame);
+	mutex_unlock(&mgr->msg_lock);
 
 	if( request->message_id != resp.message_id )
 		dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
diff --git a/sound/soc/atmel/mchp-spdiftx.c b/sound/soc/atmel/mchp-spdiftx.c
index 82c1eecd2528..3bd350afb743 100644
--- a/sound/soc/atmel/mchp-spdiftx.c
+++ b/sound/soc/atmel/mchp-spdiftx.c
@@ -487,7 +487,6 @@ static int mchp_spdiftx_hw_params(struct snd_pcm_substream *substream,
 	}
 	mchp_spdiftx_channel_status_write(dev);
 	spin_unlock_irqrestore(&ctrl->lock, flags);
-	mr |= SPDIFTX_MR_VALID1 | SPDIFTX_MR_VALID2;
 
 	if (dev->gclk_enabled) {
 		clk_disable_unprepare(dev->gclk);
diff --git a/sound/soc/codecs/cs42l51.c b/sound/soc/codecs/cs42l51.c
index 097c4e8d9950..c61b17dc2af8 100644
--- a/sound/soc/codecs/cs42l51.c
+++ b/sound/soc/codecs/cs42l51.c
@@ -254,8 +254,28 @@ static const struct snd_soc_dapm_widget cs42l51_dapm_widgets[] = {
 		&cs42l51_adcr_mux_controls),
 };
 
+static int mclk_event(struct snd_soc_dapm_widget *w,
+		      struct snd_kcontrol *kcontrol, int event)
+{
+	struct snd_soc_component *comp = snd_soc_dapm_to_component(w->dapm);
+	struct cs42l51_private *cs42l51 = snd_soc_component_get_drvdata(comp);
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		return clk_prepare_enable(cs42l51->mclk_handle);
+	case SND_SOC_DAPM_POST_PMD:
+		/* Delay mclk shutdown to fulfill power-down sequence requirements */
+		msleep(20);
+		clk_disable_unprepare(cs42l51->mclk_handle);
+		break;
+	}
+
+	return 0;
+}
+
 static const struct snd_soc_dapm_widget cs42l51_dapm_mclk_widgets[] = {
-	SND_SOC_DAPM_CLOCK_SUPPLY("MCLK")
+	SND_SOC_DAPM_SUPPLY("MCLK", SND_SOC_NOPM, 0, 0, mclk_event,
+			    SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 };
 
 static const struct snd_soc_dapm_route cs42l51_routes[] = {
diff --git a/sound/soc/codecs/rt1015.c b/sound/soc/codecs/rt1015.c
index 25fe2ddedd54..3db07293c70b 100644
--- a/sound/soc/codecs/rt1015.c
+++ b/sound/soc/codecs/rt1015.c
@@ -27,10 +27,15 @@
 #include <sound/soc-dapm.h>
 #include <sound/soc.h>
 #include <sound/tlv.h>
+#include <sound/rt1015.h>
 
 #include "rl6231.h"
 #include "rt1015.h"
 
+static const struct rt1015_platform_data i2s_default_platform_data = {
+	.power_up_delay_ms = 50,
+};
+
 static const struct reg_default rt1015_reg[] = {
 	{ 0x0000, 0x0000 },
 	{ 0x0004, 0xa000 },
@@ -539,7 +544,7 @@ static void rt1015_flush_work(struct work_struct *work)
 	struct rt1015_priv *rt1015 = container_of(work, struct rt1015_priv,
 						flush_work.work);
 	struct snd_soc_component *component = rt1015->component;
-	unsigned int val, i = 0, count = 20;
+	unsigned int val, i = 0, count = 200;
 
 	while (i < count) {
 		usleep_range(1000, 1500);
@@ -650,6 +655,7 @@ static int rt1015_amp_drv_event(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMU:
 		if (rt1015->hw_config == RT1015_HW_28)
 			schedule_delayed_work(&rt1015->flush_work, msecs_to_jiffies(10));
+		msleep(rt1015->pdata.power_up_delay_ms);
 		break;
 	default:
 		break;
@@ -1067,9 +1073,16 @@ static struct acpi_device_id rt1015_acpi_match[] = {
 MODULE_DEVICE_TABLE(acpi, rt1015_acpi_match);
 #endif
 
+static void rt1015_parse_dt(struct rt1015_priv *rt1015, struct device *dev)
+{
+	device_property_read_u32(dev, "realtek,power-up-delay-ms",
+		&rt1015->pdata.power_up_delay_ms);
+}
+
 static int rt1015_i2c_probe(struct i2c_client *i2c,
 	const struct i2c_device_id *id)
 {
+	struct rt1015_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct rt1015_priv *rt1015;
 	int ret;
 	unsigned int val;
@@ -1081,6 +1094,13 @@ static int rt1015_i2c_probe(struct i2c_client *i2c,
 
 	i2c_set_clientdata(i2c, rt1015);
 
+	rt1015->pdata = i2s_default_platform_data;
+
+	if (pdata)
+		rt1015->pdata = *pdata;
+	else
+		rt1015_parse_dt(rt1015, &i2c->dev);
+
 	rt1015->regmap = devm_regmap_init_i2c(i2c, &rt1015_regmap);
 	if (IS_ERR(rt1015->regmap)) {
 		ret = PTR_ERR(rt1015->regmap);
diff --git a/sound/soc/codecs/rt1015.h b/sound/soc/codecs/rt1015.h
index d3fdd30aca6d..15cadb361ec3 100644
--- a/sound/soc/codecs/rt1015.h
+++ b/sound/soc/codecs/rt1015.h
@@ -12,6 +12,7 @@
 
 #ifndef __RT1015_H__
 #define __RT1015_H__
+#include <sound/rt1015.h>
 
 #define RT1015_DEVICE_ID_VAL			0x1011
 #define RT1015_DEVICE_ID_VAL2			0x1015
@@ -380,6 +381,7 @@ enum {
 
 struct rt1015_priv {
 	struct snd_soc_component *component;
+	struct rt1015_platform_data pdata;
 	struct regmap *regmap;
 	int sysclk;
 	int sysclk_src;
diff --git a/sound/soc/codecs/wcd9335.c b/sound/soc/codecs/wcd9335.c
index f2d9d52ee171..4d2b1ec7c03b 100644
--- a/sound/soc/codecs/wcd9335.c
+++ b/sound/soc/codecs/wcd9335.c
@@ -618,7 +618,7 @@ static const char * const sb_tx8_mux_text[] = {
 	"ZERO", "RX_MIX_TX8", "DEC8", "DEC8_192"
 };
 
-static const DECLARE_TLV_DB_SCALE(digital_gain, 0, 1, 0);
+static const DECLARE_TLV_DB_SCALE(digital_gain, -8400, 100, -8400);
 static const DECLARE_TLV_DB_SCALE(line_gain, 0, 7, 1);
 static const DECLARE_TLV_DB_SCALE(analog_gain, 0, 25, 1);
 static const DECLARE_TLV_DB_SCALE(ear_pa_gain, 0, 150, 0);
diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c
index 35697b072367..40f682f5dab8 100644
--- a/sound/soc/codecs/wcd934x.c
+++ b/sound/soc/codecs/wcd934x.c
@@ -551,7 +551,7 @@ struct wcd_iir_filter_ctl {
 	struct soc_bytes_ext bytes_ext;
 };
 
-static const DECLARE_TLV_DB_SCALE(digital_gain, 0, 1, 0);
+static const DECLARE_TLV_DB_SCALE(digital_gain, -8400, 100, -8400);
 static const DECLARE_TLV_DB_SCALE(line_gain, 0, 7, 1);
 static const DECLARE_TLV_DB_SCALE(analog_gain, 0, 25, 1);
 static const DECLARE_TLV_DB_SCALE(ear_pa_gain, 0, 150, 0);
diff --git a/sound/soc/codecs/wsa881x.c b/sound/soc/codecs/wsa881x.c
index 68e774e69c85..4530b74f5921 100644
--- a/sound/soc/codecs/wsa881x.c
+++ b/sound/soc/codecs/wsa881x.c
@@ -1026,6 +1026,8 @@ static struct snd_soc_dai_driver wsa881x_dais[] = {
 		.id = 0,
 		.playback = {
 			.stream_name = "SPKR Playback",
+			.rates = SNDRV_PCM_RATE_48000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE,
 			.rate_max = 48000,
 			.rate_min = 48000,
 			.channels_min = 1,
diff --git a/sound/soc/intel/Kconfig b/sound/soc/intel/Kconfig
index d5bae5d1ab6f..a5b446d5af19 100644
--- a/sound/soc/intel/Kconfig
+++ b/sound/soc/intel/Kconfig
@@ -15,22 +15,6 @@ config SND_SOC_INTEL_SST_TOPLEVEL
 
 if SND_SOC_INTEL_SST_TOPLEVEL
 
-config SND_SST_IPC
-	tristate
-	# This option controls the IPC core for HiFi2 platforms
-
-config SND_SST_IPC_PCI
-	tristate
-	select SND_SST_IPC
-	# This option controls the PCI-based IPC for HiFi2 platforms
-	#  (Medfield, Merrifield).
-
-config SND_SST_IPC_ACPI
-	tristate
-	select SND_SST_IPC
-	# This option controls the ACPI-based IPC for HiFi2 platforms
-	# (Baytrail, Cherrytrail)
-
 config SND_SOC_INTEL_SST
 	tristate
 
@@ -57,7 +41,6 @@ config SND_SST_ATOM_HIFI2_PLATFORM
 config SND_SST_ATOM_HIFI2_PLATFORM_PCI
 	tristate "PCI HiFi2 (Merrifield) Platforms"
 	depends on X86 && PCI
-	select SND_SST_IPC_PCI
 	select SND_SST_ATOM_HIFI2_PLATFORM
 	help
 	  If you have a Intel Merrifield/Edison platform, then
@@ -70,7 +53,6 @@ config SND_SST_ATOM_HIFI2_PLATFORM_ACPI
 	tristate "ACPI HiFi2 (Baytrail, Cherrytrail) Platforms"
 	default ACPI
 	depends on X86 && ACPI && PCI
-	select SND_SST_IPC_ACPI
 	select SND_SST_ATOM_HIFI2_PLATFORM
 	select SND_SOC_ACPI_INTEL_MATCH
 	select IOSF_MBI
diff --git a/sound/soc/intel/atom/Makefile b/sound/soc/intel/atom/Makefile
index a9326d5ec44c..c66f03f5d8d6 100644
--- a/sound/soc/intel/atom/Makefile
+++ b/sound/soc/intel/atom/Makefile
@@ -6,4 +6,4 @@ snd-soc-sst-atom-hifi2-platform-objs :=	sst-mfld-platform-pcm.o \
 obj-$(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM) += snd-soc-sst-atom-hifi2-platform.o
 
 # DSP driver
-obj-$(CONFIG_SND_SST_IPC) += sst/
+obj-$(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM) += sst/
diff --git a/sound/soc/intel/atom/sst/Makefile b/sound/soc/intel/atom/sst/Makefile
index f17c905df3e2..5761d30a5f9d 100644
--- a/sound/soc/intel/atom/sst/Makefile
+++ b/sound/soc/intel/atom/sst/Makefile
@@ -3,6 +3,6 @@ snd-intel-sst-core-objs := sst.o sst_ipc.o sst_stream.o sst_drv_interface.o sst_
 snd-intel-sst-pci-objs += sst_pci.o
 snd-intel-sst-acpi-objs += sst_acpi.o
 
-obj-$(CONFIG_SND_SST_IPC) += snd-intel-sst-core.o
-obj-$(CONFIG_SND_SST_IPC_PCI) += snd-intel-sst-pci.o
-obj-$(CONFIG_SND_SST_IPC_ACPI) += snd-intel-sst-acpi.o
+obj-$(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM) += snd-intel-sst-core.o
+obj-$(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_PCI) += snd-intel-sst-pci.o
+obj-$(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_ACPI) += snd-intel-sst-acpi.o
diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c
index 3ea4602dfb3e..9a4b3d0973f6 100644
--- a/sound/soc/intel/boards/kbl_rt5663_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c
@@ -401,17 +401,40 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
 	struct snd_interval *chan = hw_param_interval(params,
 			SNDRV_PCM_HW_PARAM_CHANNELS);
 	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
-	struct snd_soc_dpcm *dpcm = container_of(
-			params, struct snd_soc_dpcm, hw_params);
-	struct snd_soc_dai_link *fe_dai_link = dpcm->fe->dai_link;
-	struct snd_soc_dai_link *be_dai_link = dpcm->be->dai_link;
+	struct snd_soc_dpcm *dpcm, *rtd_dpcm = NULL;
+
+	/*
+	 * The following loop will be called only for playback stream
+	 * In this platform, there is only one playback device on every SSP
+	 */
+	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
+		rtd_dpcm = dpcm;
+		break;
+	}
+
+	/*
+	 * This following loop will be called only for capture stream
+	 * In this platform, there is only one capture device on every SSP
+	 */
+	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_CAPTURE, dpcm) {
+		rtd_dpcm = dpcm;
+		break;
+	}
+
+	if (!rtd_dpcm)
+		return -EINVAL;
+
+	/*
+	 * The above 2 loops are mutually exclusive based on the stream direction,
+	 * thus rtd_dpcm variable will never be overwritten
+	 */
 
 	/*
 	 * The ADSP will convert the FE rate to 48k, stereo, 24 bit
 	 */
-	if (!strcmp(fe_dai_link->name, "Kbl Audio Port") ||
-	    !strcmp(fe_dai_link->name, "Kbl Audio Headset Playback") ||
-	    !strcmp(fe_dai_link->name, "Kbl Audio Capture Port")) {
+	if (!strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Port") ||
+	    !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Headset Playback") ||
+	    !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Capture Port")) {
 		rate->min = rate->max = 48000;
 		chan->min = chan->max = 2;
 		snd_mask_none(fmt);
@@ -421,7 +444,7 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
 	 * The speaker on the SSP0 supports S16_LE and not S24_LE.
 	 * thus changing the mask here
 	 */
-	if (!strcmp(be_dai_link->name, "SSP0-Codec"))
+	if (!strcmp(rtd_dpcm->be->dai_link->name, "SSP0-Codec"))
 		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
 
 	return 0;
diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
index 922cd0176e1f..f95546c184aa 100644
--- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
@@ -700,6 +700,8 @@ static int kabylake_set_bias_level(struct snd_soc_card *card,
 	switch (level) {
 	case SND_SOC_BIAS_PREPARE:
 		if (dapm->bias_level == SND_SOC_BIAS_ON) {
+			if (!__clk_is_enabled(priv->mclk))
+				return 0;
 			dev_dbg(card->dev, "Disable mclk");
 			clk_disable_unprepare(priv->mclk);
 		} else {
diff --git a/sound/soc/intel/catpt/dsp.c b/sound/soc/intel/catpt/dsp.c
index 7d2968571951..9e807b941732 100644
--- a/sound/soc/intel/catpt/dsp.c
+++ b/sound/soc/intel/catpt/dsp.c
@@ -267,9 +267,12 @@ static int catpt_dsp_select_lpclock(struct catpt_dev *cdev, bool lp, bool waiti)
 					    reg, (reg & CATPT_ISD_DCPWM),
 					    500, 10000);
 		if (ret) {
-			dev_err(cdev->dev, "await WAITI timeout\n");
-			mutex_unlock(&cdev->clk_mutex);
-			return ret;
+			dev_warn(cdev->dev, "await WAITI timeout\n");
+			/* no signal - only high clock selection allowed */
+			if (lp) {
+				mutex_unlock(&cdev->clk_mutex);
+				return 0;
+			}
 		}
 	}
 
diff --git a/sound/soc/intel/catpt/pcm.c b/sound/soc/intel/catpt/pcm.c
index f78018c857b8..408e64e3b5fb 100644
--- a/sound/soc/intel/catpt/pcm.c
+++ b/sound/soc/intel/catpt/pcm.c
@@ -458,10 +458,6 @@ static int catpt_dai_prepare(struct snd_pcm_substream *substream,
 	if (ret)
 		return CATPT_IPC_ERROR(ret);
 
-	ret = catpt_dsp_update_lpclock(cdev);
-	if (ret)
-		return ret;
-
 	ret = catpt_dai_apply_usettings(dai, stream);
 	if (ret)
 		return ret;
@@ -500,6 +496,7 @@ static int catpt_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 	resume_stream:
+		catpt_dsp_update_lpclock(cdev);
 		ret = catpt_ipc_resume_stream(cdev, stream->info.stream_hw_id);
 		if (ret)
 			return CATPT_IPC_ERROR(ret);
@@ -507,11 +504,11 @@ static int catpt_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 
 	case SNDRV_PCM_TRIGGER_STOP:
 		stream->prepared = false;
-		catpt_dsp_update_lpclock(cdev);
 		fallthrough;
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		ret = catpt_ipc_pause_stream(cdev, stream->info.stream_hw_id);
+		catpt_dsp_update_lpclock(cdev);
 		if (ret)
 			return CATPT_IPC_ERROR(ret);
 		break;
@@ -534,6 +531,8 @@ void catpt_stream_update_position(struct catpt_dev *cdev,
 
 	dsppos = bytes_to_frames(r, pos->stream_position);
 
+	if (!stream->prepared)
+		goto exit;
 	/* only offload is set_write_pos driven */
 	if (stream->template->type != CATPT_STRM_TYPE_RENDER)
 		goto exit;
@@ -667,7 +666,17 @@ static int catpt_dai_pcm_new(struct snd_soc_pcm_runtime *rtm,
 		break;
 	}
 
+	/* see if this is a new configuration */
+	if (!memcmp(&cdev->devfmt[devfmt.iface], &devfmt, sizeof(devfmt)))
+		return 0;
+
+	pm_runtime_get_sync(cdev->dev);
+
 	ret = catpt_ipc_set_device_format(cdev, &devfmt);
+
+	pm_runtime_mark_last_busy(cdev->dev);
+	pm_runtime_put_autosuspend(cdev->dev);
+
 	if (ret)
 		return CATPT_IPC_ERROR(ret);
 
diff --git a/sound/soc/intel/keembay/kmb_platform.c b/sound/soc/intel/keembay/kmb_platform.c
index f54b710ee1c2..291a686568c2 100644
--- a/sound/soc/intel/keembay/kmb_platform.c
+++ b/sound/soc/intel/keembay/kmb_platform.c
@@ -487,9 +487,9 @@ static int kmb_dai_hw_params(struct snd_pcm_substream *substream,
 		kmb_i2s->xfer_resolution = 0x02;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
-		config->data_width = 24;
-		kmb_i2s->ccr = 0x08;
-		kmb_i2s->xfer_resolution = 0x04;
+		config->data_width = 32;
+		kmb_i2s->ccr = 0x14;
+		kmb_i2s->xfer_resolution = 0x05;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		config->data_width = 32;
diff --git a/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c b/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
index c2c1eb16fcc0..26e7d9a7198f 100644
--- a/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
+++ b/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
@@ -630,15 +630,34 @@ static struct snd_soc_codec_conf mt8183_da7219_rt1015_codec_conf[] = {
 	},
 };
 
+static const struct snd_kcontrol_new mt8183_da7219_rt1015_snd_controls[] = {
+	SOC_DAPM_PIN_SWITCH("Left Spk"),
+	SOC_DAPM_PIN_SWITCH("Right Spk"),
+};
+
+static const
+struct snd_soc_dapm_widget mt8183_da7219_rt1015_dapm_widgets[] = {
+	SND_SOC_DAPM_SPK("Left Spk", NULL),
+	SND_SOC_DAPM_SPK("Right Spk", NULL),
+	SND_SOC_DAPM_PINCTRL("TDM_OUT_PINCTRL",
+			     "aud_tdm_out_on", "aud_tdm_out_off"),
+};
+
+static const struct snd_soc_dapm_route mt8183_da7219_rt1015_dapm_routes[] = {
+	{"Left Spk", NULL, "Left SPO"},
+	{"Right Spk", NULL, "Right SPO"},
+	{"I2S Playback", NULL, "TDM_OUT_PINCTRL"},
+};
+
 static struct snd_soc_card mt8183_da7219_rt1015_card = {
 	.name = "mt8183_da7219_rt1015",
 	.owner = THIS_MODULE,
-	.controls = mt8183_da7219_max98357_snd_controls,
-	.num_controls = ARRAY_SIZE(mt8183_da7219_max98357_snd_controls),
-	.dapm_widgets = mt8183_da7219_max98357_dapm_widgets,
-	.num_dapm_widgets = ARRAY_SIZE(mt8183_da7219_max98357_dapm_widgets),
-	.dapm_routes = mt8183_da7219_max98357_dapm_routes,
-	.num_dapm_routes = ARRAY_SIZE(mt8183_da7219_max98357_dapm_routes),
+	.controls = mt8183_da7219_rt1015_snd_controls,
+	.num_controls = ARRAY_SIZE(mt8183_da7219_rt1015_snd_controls),
+	.dapm_widgets = mt8183_da7219_rt1015_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(mt8183_da7219_rt1015_dapm_widgets),
+	.dapm_routes = mt8183_da7219_rt1015_dapm_routes,
+	.num_dapm_routes = ARRAY_SIZE(mt8183_da7219_rt1015_dapm_routes),
 	.dai_link = mt8183_da7219_dai_links,
 	.num_links = ARRAY_SIZE(mt8183_da7219_dai_links),
 	.aux_dev = &mt8183_da7219_max98357_headset_dev,
diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
index ba2aca301a9b..9d17c87445a9 100644
--- a/sound/soc/qcom/lpass-cpu.c
+++ b/sound/soc/qcom/lpass-cpu.c
@@ -80,6 +80,12 @@ static int lpass_cpu_daiops_startup(struct snd_pcm_substream *substream,
 		dev_err(dai->dev, "error in enabling mi2s osr clk: %d\n", ret);
 		return ret;
 	}
+	ret = clk_prepare(drvdata->mi2s_bit_clk[dai->driver->id]);
+	if (ret) {
+		dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret);
+		clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
+		return ret;
+	}
 	return 0;
 }
 
@@ -88,9 +94,8 @@ static void lpass_cpu_daiops_shutdown(struct snd_pcm_substream *substream,
 {
 	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
 
-	clk_disable_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]);
-
 	clk_disable_unprepare(drvdata->mi2s_osr_clk[dai->driver->id]);
+	clk_unprepare(drvdata->mi2s_bit_clk[dai->driver->id]);
 }
 
 static int lpass_cpu_daiops_hw_params(struct snd_pcm_substream *substream,
@@ -303,10 +308,10 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
 			dev_err(dai->dev, "error writing to i2sctl reg: %d\n",
 				ret);
 
-		ret = clk_prepare_enable(drvdata->mi2s_bit_clk[id]);
+		ret = clk_enable(drvdata->mi2s_bit_clk[id]);
 		if (ret) {
 			dev_err(dai->dev, "error in enabling mi2s bit clk: %d\n", ret);
-			clk_disable_unprepare(drvdata->mi2s_osr_clk[id]);
+			clk_disable(drvdata->mi2s_osr_clk[id]);
 			return ret;
 		}
 
@@ -324,6 +329,7 @@ static int lpass_cpu_daiops_trigger(struct snd_pcm_substream *substream,
 		if (ret)
 			dev_err(dai->dev, "error writing to i2sctl reg: %d\n",
 				ret);
+		clk_disable(drvdata->mi2s_bit_clk[dai->driver->id]);
 		break;
 	}
 
diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
index 36d1512ffd1f..7a3fdf89968a 100644
--- a/sound/soc/qcom/lpass-platform.c
+++ b/sound/soc/qcom/lpass-platform.c
@@ -122,8 +122,10 @@ static int lpass_platform_pcmops_open(struct snd_soc_component *component,
 	else
 		dma_ch = 0;
 
-	if (dma_ch < 0)
+	if (dma_ch < 0) {
+		kfree(data);
 		return dma_ch;
+	}
 
 	if (cpu_dai->driver->id == LPASS_DP_RX) {
 		map = drvdata->hdmiif_map;
@@ -147,6 +149,7 @@ static int lpass_platform_pcmops_open(struct snd_soc_component *component,
 	ret = snd_pcm_hw_constraint_integer(runtime,
 			SNDRV_PCM_HW_PARAM_PERIODS);
 	if (ret < 0) {
+		kfree(data);
 		dev_err(soc_runtime->dev, "setting constraints failed: %d\n",
 			ret);
 		return -EINVAL;
diff --git a/sound/soc/qcom/lpass-sc7180.c b/sound/soc/qcom/lpass-sc7180.c
index c6292f9e613f..bc998d501600 100644
--- a/sound/soc/qcom/lpass-sc7180.c
+++ b/sound/soc/qcom/lpass-sc7180.c
@@ -188,7 +188,7 @@ static struct lpass_variant sc7180_data = {
 	.micmode		= REG_FIELD_ID(0x1000, 4, 8, 3, 0x1000),
 	.micmono		= REG_FIELD_ID(0x1000, 3, 3, 3, 0x1000),
 	.wssrc			= REG_FIELD_ID(0x1000, 2, 2, 3, 0x1000),
-	.bitwidth		= REG_FIELD_ID(0x1000, 0, 0, 3, 0x1000),
+	.bitwidth		= REG_FIELD_ID(0x1000, 0, 1, 3, 0x1000),
 
 	.rdma_dyncclk		= REG_FIELD_ID(0xC000, 21, 21, 5, 0x1000),
 	.rdma_bursten		= REG_FIELD_ID(0xC000, 20, 20, 5, 0x1000),
diff --git a/sound/soc/qcom/sdm845.c b/sound/soc/qcom/sdm845.c
index ab1bf23c21a6..6c2760e27ea6 100644
--- a/sound/soc/qcom/sdm845.c
+++ b/sound/soc/qcom/sdm845.c
@@ -17,6 +17,7 @@
 #include "qdsp6/q6afe.h"
 #include "../codecs/rt5663.h"
 
+#define DRIVER_NAME	"sdm845"
 #define DEFAULT_SAMPLE_RATE_48K		48000
 #define DEFAULT_MCLK_RATE		24576000
 #define TDM_BCLK_RATE		6144000
@@ -552,6 +553,7 @@ static int sdm845_snd_platform_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	card->driver_name = DRIVER_NAME;
 	card->dapm_widgets = sdm845_snd_widgets;
 	card->num_dapm_widgets = ARRAY_SIZE(sdm845_snd_widgets);
 	card->dev = dev;
diff --git a/sound/soc/sof/loader.c b/sound/soc/sof/loader.c
index 68ed454f7ddf..ba9ed66f98bc 100644
--- a/sound/soc/sof/loader.c
+++ b/sound/soc/sof/loader.c
@@ -118,6 +118,11 @@ int snd_sof_fw_parse_ext_data(struct snd_sof_dev *sdev, u32 bar, u32 offset)
 		case SOF_IPC_EXT_CC_INFO:
 			ret = get_cc_info(sdev, ext_hdr);
 			break;
+		case SOF_IPC_EXT_UNUSED:
+		case SOF_IPC_EXT_PROBE_INFO:
+		case SOF_IPC_EXT_USER_ABI_INFO:
+			/* They are supported but we don't do anything here */
+			break;
 		default:
 			dev_warn(sdev->dev, "warning: unknown ext header type %d size 0x%x\n",
 				 ext_hdr->type, ext_hdr->hdr.size);
diff --git a/sound/usb/Makefile b/sound/usb/Makefile
index 56031026b113..9ccb21a4ff8a 100644
--- a/sound/usb/Makefile
+++ b/sound/usb/Makefile
@@ -8,6 +8,7 @@ snd-usb-audio-objs := 	card.o \
 			endpoint.o \
 			format.o \
 			helper.o \
+			implicit.o \
 			mixer.o \
 			mixer_quirks.o \
 			mixer_scarlett.o \
diff --git a/sound/usb/card.c b/sound/usb/card.c
index fa764b61fe9c..cb0b6582dfee 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -49,7 +49,6 @@
 #include "quirks.h"
 #include "endpoint.h"
 #include "helper.h"
-#include "debug.h"
 #include "pcm.h"
 #include "format.h"
 #include "power.h"
@@ -73,6 +72,7 @@ static bool ignore_ctl_error;
 static bool autoclock = true;
 static char *quirk_alias[SNDRV_CARDS];
 static char *delayed_register[SNDRV_CARDS];
+static bool implicit_fb[SNDRV_CARDS];
 
 bool snd_usb_use_vmalloc = true;
 bool snd_usb_skip_validation;
@@ -98,6 +98,8 @@ module_param_array(quirk_alias, charp, NULL, 0444);
 MODULE_PARM_DESC(quirk_alias, "Quirk aliases, e.g. 0123abcd:5678beef.");
 module_param_array(delayed_register, charp, NULL, 0444);
 MODULE_PARM_DESC(delayed_register, "Quirk for delayed registration, given by id:iface, e.g. 0123abcd:4.");
+module_param_array(implicit_fb, bool, NULL, 0444);
+MODULE_PARM_DESC(implicit_fb, "Apply generic implicit feedback sync mode.");
 module_param_named(use_vmalloc, snd_usb_use_vmalloc, bool, 0444);
 MODULE_PARM_DESC(use_vmalloc, "Use vmalloc for PCM intermediate buffers (default: yes).");
 module_param_named(skip_validation, snd_usb_skip_validation, bool, 0444);
@@ -125,7 +127,6 @@ static void snd_usb_stream_disconnect(struct snd_usb_stream *as)
 		subs = &as->substream[idx];
 		if (!subs->num_formats)
 			continue;
-		subs->interface = -1;
 		subs->data_endpoint = NULL;
 		subs->sync_endpoint = NULL;
 	}
@@ -379,6 +380,10 @@ static const struct usb_audio_device_name usb_audio_names[] = {
 
 	DEVICE_NAME(0x046d, 0x0990, "Logitech, Inc.", "QuickCam Pro 9000"),
 
+	/* ASUS ROG Strix */
+	PROFILE_NAME(0x0b05, 0x1917,
+		     "Realtek", "ALC1220-VB-DT", "Realtek-ALC1220-VB-Desktop"),
+
 	/* Dell WD15 Dock */
 	PROFILE_NAME(0x0bda, 0x4014, "Dell", "WD15 Dock", "Dell-WD15-Dock"),
 	/* Dell WD19 Dock */
@@ -594,6 +599,7 @@ static int snd_usb_audio_create(struct usb_interface *intf,
 	chip->dev = dev;
 	chip->card = card;
 	chip->setup = device_setup[idx];
+	chip->generic_implicit_fb = implicit_fb[idx];
 	chip->autoclock = autoclock;
 	atomic_set(&chip->active, 1); /* avoid autopm during probing */
 	atomic_set(&chip->usage_count, 0);
@@ -977,6 +983,7 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 {
 	struct snd_usb_audio *chip = usb_get_intfdata(intf);
 	struct snd_usb_stream *as;
+	struct snd_usb_endpoint *ep;
 	struct usb_mixer_interface *mixer;
 	struct list_head *p;
 
@@ -984,11 +991,10 @@ static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 		return 0;
 
 	if (!chip->num_suspended_intf++) {
-		list_for_each_entry(as, &chip->pcm_list, list) {
+		list_for_each_entry(as, &chip->pcm_list, list)
 			snd_usb_pcm_suspend(as);
-			as->substream[0].need_setup_ep =
-				as->substream[1].need_setup_ep = true;
-		}
+		list_for_each_entry(ep, &chip->ep_list, list)
+			snd_usb_endpoint_suspend(ep);
 		list_for_each(p, &chip->midi_list)
 			snd_usbmidi_suspend(p);
 		list_for_each_entry(mixer, &chip->mixer_list, list)
diff --git a/sound/usb/card.h b/sound/usb/card.h
index 5351d7183b1b..6a027c349194 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -16,12 +16,17 @@ struct audioformat {
 	unsigned int fmt_type;		/* USB audio format type (1-3) */
 	unsigned int fmt_bits;		/* number of significant bits */
 	unsigned int frame_size;	/* samples per frame for non-audio */
-	int iface;			/* interface number */
+	unsigned char iface;		/* interface number */
 	unsigned char altsetting;	/* corresponding alternate setting */
 	unsigned char altset_idx;	/* array index of altenate setting */
 	unsigned char attributes;	/* corresponding attributes of cs endpoint */
 	unsigned char endpoint;		/* endpoint */
 	unsigned char ep_attr;		/* endpoint attributes */
+	bool implicit_fb;		/* implicit feedback endpoint */
+	unsigned char sync_ep;		/* sync endpoint number */
+	unsigned char sync_iface;	/* sync EP interface */
+	unsigned char sync_altsetting;	/* sync EP alternate setting */
+	unsigned char sync_ep_idx;	/* sync EP array index */
 	unsigned char datainterval;	/* log_2 of data packet interval */
 	unsigned char protocol;		/* UAC_VERSION_1/2/3 */
 	unsigned int maxpacksize;	/* max. packet size */
@@ -54,10 +59,16 @@ struct snd_urb_ctx {
 struct snd_usb_endpoint {
 	struct snd_usb_audio *chip;
 
-	int use_count;
+	int opened;		/* open refcount; protect with chip->mutex */
+	atomic_t running;	/* running status */
 	int ep_num;		/* the referenced endpoint number */
 	int type;		/* SND_USB_ENDPOINT_TYPE_* */
-	unsigned long flags;
+
+	unsigned char iface;		/* interface number */
+	unsigned char altsetting;	/* corresponding alternate setting */
+	unsigned char ep_idx;		/* endpoint array index */
+
+	unsigned long flags;	/* running bit flags */
 
 	void (*prepare_data_urb) (struct snd_usb_substream *subs,
 				  struct urb *urb);
@@ -65,8 +76,8 @@ struct snd_usb_endpoint {
 				 struct urb *urb);
 
 	struct snd_usb_substream *data_subs;
-	struct snd_usb_endpoint *sync_master;
-	struct snd_usb_endpoint *sync_slave;
+	struct snd_usb_endpoint *sync_source;
+	struct snd_usb_endpoint *sync_sink;
 
 	struct snd_urb_ctx urb[MAX_URBS];
 
@@ -74,8 +85,9 @@ struct snd_usb_endpoint {
 		uint32_t packet_size[MAX_PACKS_HS];
 		int packets;
 	} next_packet[MAX_URBS];
-	int next_packet_read_pos, next_packet_write_pos;
-	struct list_head ready_playback_urbs;
+	unsigned int next_packet_head;	/* ring buffer offset to read */
+	unsigned int next_packet_queued; /* queued items in the ring buffer */
+	struct list_head ready_playback_urbs; /* playback URB FIFO for implicit fb */
 
 	unsigned int nurbs;		/* # urbs */
 	unsigned long active_mask;	/* bitmask of active urbs */
@@ -105,10 +117,20 @@ struct snd_usb_endpoint {
 	unsigned int syncinterval;	/* P for adaptive mode, 0 otherwise */
 	unsigned char silence_value;
 	unsigned int stride;
-	int iface, altsetting;
 	int skip_packets;		/* quirks for devices to ignore the first n packets
 					   in a stream */
-	bool is_implicit_feedback;      /* This endpoint is used as implicit feedback */
+	bool implicit_fb_sync;		/* syncs with implicit feedback */
+	bool need_setup;		/* (re-)need for configure? */
+
+	/* for hw constraints */
+	const struct audioformat *cur_audiofmt;
+	unsigned int cur_rate;
+	snd_pcm_format_t cur_format;
+	unsigned int cur_channels;
+	unsigned int cur_frame_bytes;
+	unsigned int cur_period_frames;
+	unsigned int cur_period_bytes;
+	unsigned int cur_buffer_periods;
 
 	spinlock_t lock;
 	struct list_head list;
@@ -121,18 +143,10 @@ struct snd_usb_substream {
 	struct usb_device *dev;
 	struct snd_pcm_substream *pcm_substream;
 	int direction;	/* playback or capture */
-	int interface;	/* current interface */
 	int endpoint;	/* assigned endpoint */
-	struct audioformat *cur_audiofmt;	/* current audioformat pointer (for hw_params callback) */
+	const struct audioformat *cur_audiofmt;	/* current audioformat pointer (for hw_params callback) */
 	struct snd_usb_power_domain *str_pd;	/* UAC3 Power Domain for streaming path */
-	snd_pcm_format_t pcm_format;	/* current audio format (for hw_params callback) */
-	unsigned int channels;		/* current number of channels (for hw_params callback) */
 	unsigned int channels_max;	/* max channels in the all audiofmts */
-	unsigned int cur_rate;		/* current rate (for hw_params callback) */
-	unsigned int period_bytes;	/* current period bytes (for hw_params callback) */
-	unsigned int period_frames;	/* current frames per period */
-	unsigned int buffer_periods;	/* current periods per buffer */
-	unsigned int altset_idx;     /* USB data format: index of alternate setting */
 	unsigned int txfr_quirk:1;	/* allow sub-frame alignment */
 	unsigned int tx_length_quirk:1;	/* add length specifier to transfers */
 	unsigned int fmt_type;		/* USB audio format type (1-3) */
@@ -150,14 +164,11 @@ struct snd_usb_substream {
 	struct snd_usb_endpoint *data_endpoint;
 	struct snd_usb_endpoint *sync_endpoint;
 	unsigned long flags;
-	bool need_setup_ep;		/* (re)configure EP at prepare? */
-	bool need_setup_fmt;		/* (re)configure fmt after resume? */
 	unsigned int speed;		/* USB_SPEED_XXX */
 
 	u64 formats;			/* format bitmasks (all or'ed) */
 	unsigned int num_formats;		/* number of supported audio formats (list) */
 	struct list_head fmt_list;	/* format list */
-	struct snd_pcm_hw_constraint_list rate_list;	/* limited rates */
 	spinlock_t lock;
 
 	int last_frame_number;          /* stored frame number */
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index f3ca59005d91..e940dcee792b 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -152,7 +152,7 @@ static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_i
 }
 
 static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
-					    struct audioformat *fmt,
+					    const struct audioformat *fmt,
 					    int source_id)
 {
 	bool ret = false;
@@ -215,7 +215,7 @@ static bool uac_clock_source_is_valid_quirk(struct snd_usb_audio *chip,
 }
 
 static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
-				      struct audioformat *fmt,
+				      const struct audioformat *fmt,
 				      int source_id)
 {
 	int err;
@@ -264,7 +264,7 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
 }
 
 static int __uac_clock_find_source(struct snd_usb_audio *chip,
-				   struct audioformat *fmt, int entity_id,
+				   const struct audioformat *fmt, int entity_id,
 				   unsigned long *visited, bool validate)
 {
 	struct uac_clock_source_descriptor *source;
@@ -358,7 +358,7 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip,
 }
 
 static int __uac3_clock_find_source(struct snd_usb_audio *chip,
-				    struct audioformat *fmt, int entity_id,
+				    const struct audioformat *fmt, int entity_id,
 				    unsigned long *visited, bool validate)
 {
 	struct uac3_clock_source_descriptor *source;
@@ -464,7 +464,7 @@ static int __uac3_clock_find_source(struct snd_usb_audio *chip,
  * Returns the clock source UnitID (>=0) on success, or an error.
  */
 int snd_usb_clock_find_source(struct snd_usb_audio *chip,
-			      struct audioformat *fmt, bool validate)
+			      const struct audioformat *fmt, bool validate)
 {
 	DECLARE_BITMAP(visited, 256);
 	memset(visited, 0, sizeof(visited));
@@ -481,15 +481,18 @@ int snd_usb_clock_find_source(struct snd_usb_audio *chip,
 	}
 }
 
-static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
-			      struct usb_host_interface *alts,
-			      struct audioformat *fmt, int rate)
+static int set_sample_rate_v1(struct snd_usb_audio *chip,
+			      const struct audioformat *fmt, int rate)
 {
 	struct usb_device *dev = chip->dev;
+	struct usb_host_interface *alts;
 	unsigned int ep;
 	unsigned char data[3];
 	int err, crate;
 
+	alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
+	if (!alts)
+		return -EINVAL;
 	if (get_iface_desc(alts)->bNumEndpoints < 1)
 		return -EINVAL;
 	ep = get_endpoint(alts, 0)->bEndpointAddress;
@@ -507,7 +510,7 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
 			      data, sizeof(data));
 	if (err < 0) {
 		dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n",
-			iface, fmt->altsetting, rate, ep);
+			fmt->iface, fmt->altsetting, rate, ep);
 		return err;
 	}
 
@@ -525,7 +528,7 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
 			      data, sizeof(data));
 	if (err < 0) {
 		dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
-			iface, fmt->altsetting, ep);
+			fmt->iface, fmt->altsetting, ep);
 		chip->sample_rate_read_error++;
 		return 0; /* some devices don't support reading */
 	}
@@ -560,16 +563,58 @@ static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
 	return le32_to_cpu(data);
 }
 
-static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
-			      struct usb_host_interface *alts,
-			      struct audioformat *fmt, int rate)
+/*
+ * Try to set the given sample rate:
+ *
+ * Return 0 if the clock source is read-only, the actual rate on success,
+ * or a negative error code.
+ *
+ * This function gets called from format.c to validate each sample rate, too.
+ * Hence no message is shown upon error
+ */
+int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
+				 const struct audioformat *fmt,
+				 int clock, int rate)
 {
-	struct usb_device *dev = chip->dev;
-	__le32 data;
-	int err, cur_rate, prev_rate;
-	int clock;
 	bool writeable;
 	u32 bmControls;
+	__le32 data;
+	int err;
+
+	if (fmt->protocol == UAC_VERSION_3) {
+		struct uac3_clock_source_descriptor *cs_desc;
+
+		cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
+		bmControls = le32_to_cpu(cs_desc->bmControls);
+	} else {
+		struct uac_clock_source_descriptor *cs_desc;
+
+		cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
+		bmControls = cs_desc->bmControls;
+	}
+
+	writeable = uac_v2v3_control_is_writeable(bmControls,
+						  UAC2_CS_CONTROL_SAM_FREQ);
+	if (!writeable)
+		return 0;
+
+	data = cpu_to_le32(rate);
+	err = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0), UAC2_CS_CUR,
+			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
+			      UAC2_CS_CONTROL_SAM_FREQ << 8,
+			      snd_usb_ctrl_intf(chip) | (clock << 8),
+			      &data, sizeof(data));
+	if (err < 0)
+		return err;
+
+	return get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
+}
+
+static int set_sample_rate_v2v3(struct snd_usb_audio *chip,
+				const struct audioformat *fmt, int rate)
+{
+	int cur_rate, prev_rate;
+	int clock;
 
 	/* First, try to find a valid clock. This may trigger
 	 * automatic clock selection if the current clock is not
@@ -588,63 +633,26 @@ static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
 			return clock;
 	}
 
-	prev_rate = get_sample_rate_v2v3(chip, iface, fmt->altsetting, clock);
+	prev_rate = get_sample_rate_v2v3(chip, fmt->iface, fmt->altsetting, clock);
 	if (prev_rate == rate)
 		goto validation;
 
-	if (fmt->protocol == UAC_VERSION_3) {
-		struct uac3_clock_source_descriptor *cs_desc;
-
-		cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
-		bmControls = le32_to_cpu(cs_desc->bmControls);
-	} else {
-		struct uac_clock_source_descriptor *cs_desc;
-
-		cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
-		bmControls = cs_desc->bmControls;
+	cur_rate = snd_usb_set_sample_rate_v2v3(chip, fmt, clock, rate);
+	if (cur_rate < 0) {
+		usb_audio_err(chip,
+			      "%d:%d: cannot set freq %d (v2/v3): err %d\n",
+			      fmt->iface, fmt->altsetting, rate, cur_rate);
+		return cur_rate;
 	}
 
-	writeable = uac_v2v3_control_is_writeable(bmControls,
-						  UAC2_CS_CONTROL_SAM_FREQ);
-	if (writeable) {
-		data = cpu_to_le32(rate);
-		err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
-				      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
-				      UAC2_CS_CONTROL_SAM_FREQ << 8,
-				      snd_usb_ctrl_intf(chip) | (clock << 8),
-				      &data, sizeof(data));
-		if (err < 0) {
-			usb_audio_err(chip,
-				"%d:%d: cannot set freq %d (v2/v3): err %d\n",
-				iface, fmt->altsetting, rate, err);
-			return err;
-		}
-
-		cur_rate = get_sample_rate_v2v3(chip, iface,
-						fmt->altsetting, clock);
-	} else {
+	if (!cur_rate)
 		cur_rate = prev_rate;
-	}
 
 	if (cur_rate != rate) {
-		if (!writeable) {
-			usb_audio_warn(chip,
-				 "%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
-				 iface, fmt->altsetting, rate, cur_rate);
-			return -ENXIO;
-		}
-		usb_audio_dbg(chip,
-			"current rate %d is different from the runtime rate %d\n",
-			cur_rate, rate);
-	}
-
-	/* Some devices doesn't respond to sample rate changes while the
-	 * interface is active. */
-	if (rate != prev_rate) {
-		usb_set_interface(dev, iface, 0);
-		snd_usb_set_interface_quirk(dev);
-		usb_set_interface(dev, iface, fmt->altsetting);
-		snd_usb_set_interface_quirk(dev);
+		usb_audio_warn(chip,
+			       "%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
+			       fmt->iface, fmt->altsetting, rate, cur_rate);
+		return -ENXIO;
 	}
 
 validation:
@@ -654,14 +662,16 @@ validation:
 	return 0;
 }
 
-int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
-			     struct usb_host_interface *alts,
-			     struct audioformat *fmt, int rate)
+int snd_usb_init_sample_rate(struct snd_usb_audio *chip,
+			     const struct audioformat *fmt, int rate)
 {
+	usb_audio_dbg(chip, "%d:%d Set sample rate %d, clock %d\n",
+		      fmt->iface, fmt->altsetting, rate, fmt->clock);
+
 	switch (fmt->protocol) {
 	case UAC_VERSION_1:
 	default:
-		return set_sample_rate_v1(chip, iface, alts, fmt, rate);
+		return set_sample_rate_v1(chip, fmt, rate);
 
 	case UAC_VERSION_3:
 		if (chip->badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
@@ -672,7 +682,7 @@ int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
 		}
 		fallthrough;
 	case UAC_VERSION_2:
-		return set_sample_rate_v2v3(chip, iface, alts, fmt, rate);
+		return set_sample_rate_v2v3(chip, fmt, rate);
 	}
 }
 
diff --git a/sound/usb/clock.h b/sound/usb/clock.h
index 68df0fbe09d0..ed9fc2dc0510 100644
--- a/sound/usb/clock.h
+++ b/sound/usb/clock.h
@@ -2,11 +2,14 @@
 #ifndef __USBAUDIO_CLOCK_H
 #define __USBAUDIO_CLOCK_H
 
-int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
-			     struct usb_host_interface *alts,
-			     struct audioformat *fmt, int rate);
+int snd_usb_init_sample_rate(struct snd_usb_audio *chip,
+			     const struct audioformat *fmt, int rate);
 
 int snd_usb_clock_find_source(struct snd_usb_audio *chip,
-			      struct audioformat *fmt, bool validate);
+			      const struct audioformat *fmt, bool validate);
+
+int snd_usb_set_sample_rate_v2v3(struct snd_usb_audio *chip,
+				 const struct audioformat *fmt,
+				 int clock, int rate);
 
 #endif /* __USBAUDIO_CLOCK_H */
diff --git a/sound/usb/debug.h b/sound/usb/debug.h
deleted file mode 100644
index 7dd983c35001..000000000000
--- a/sound/usb/debug.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __USBAUDIO_DEBUG_H
-#define __USBAUDIO_DEBUG_H
-
-/*
- * h/w constraints
- */
-
-#ifdef HW_CONST_DEBUG
-#define hwc_debug(fmt, args...) printk(KERN_DEBUG fmt, ##args)
-#else
-#define hwc_debug(fmt, args...) do { } while(0)
-#endif
-
-#endif /* __USBAUDIO_DEBUG_H */
-
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index e2f9ce2f5b8b..162da7a50046 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -18,6 +18,7 @@
 #include "card.h"
 #include "endpoint.h"
 #include "pcm.h"
+#include "clock.h"
 #include "quirks.h"
 
 #define EP_FLAG_RUNNING		1
@@ -116,20 +117,17 @@ static const char *usb_error_string(int err)
  */
 int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep)
 {
-	return  ep->sync_master &&
-		ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA &&
-		ep->type == SND_USB_ENDPOINT_TYPE_DATA &&
-		usb_pipeout(ep->pipe);
+	return  ep->implicit_fb_sync && usb_pipeout(ep->pipe);
 }
 
 /*
- * For streaming based on information derived from sync endpoints,
- * prepare_outbound_urb_sizes() will call slave_next_packet_size() to
- * determine the number of samples to be sent in the next packet.
+ * Return the number of samples to be sent in the next packet
+ * for streaming based on information derived from sync endpoints
  *
- * For implicit feedback, slave_next_packet_size() is unused.
+ * This won't be used for implicit feedback which takes the packet size
+ * returned from the sync source
  */
-int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep)
+static int slave_next_packet_size(struct snd_usb_endpoint *ep)
 {
 	unsigned long flags;
 	int ret;
@@ -147,11 +145,10 @@ int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep)
 }
 
 /*
- * For adaptive and synchronous endpoints, prepare_outbound_urb_sizes()
- * will call next_packet_size() to determine the number of samples to be
- * sent in the next packet.
+ * Return the number of samples to be sent in the next packet
+ * for adaptive and synchronous endpoints
  */
-int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
+static int next_packet_size(struct snd_usb_endpoint *ep)
 {
 	int ret;
 
@@ -169,28 +166,57 @@ int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep)
 	return ret;
 }
 
+/*
+ * snd_usb_endpoint_next_packet_size: Return the number of samples to be sent
+ * in the next packet
+ */
+int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep,
+				      struct snd_urb_ctx *ctx, int idx)
+{
+	if (ctx->packet_size[idx])
+		return ctx->packet_size[idx];
+	else if (ep->sync_source)
+		return slave_next_packet_size(ep);
+	else
+		return next_packet_size(ep);
+}
+
+static void call_retire_callback(struct snd_usb_endpoint *ep,
+				 struct urb *urb)
+{
+	struct snd_usb_substream *data_subs;
+
+	data_subs = READ_ONCE(ep->data_subs);
+	if (data_subs && ep->retire_data_urb)
+		ep->retire_data_urb(data_subs, urb);
+}
+
 static void retire_outbound_urb(struct snd_usb_endpoint *ep,
 				struct snd_urb_ctx *urb_ctx)
 {
-	if (ep->retire_data_urb)
-		ep->retire_data_urb(ep->data_subs, urb_ctx->urb);
+	call_retire_callback(ep, urb_ctx->urb);
 }
 
+static void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
+				    struct snd_usb_endpoint *sender,
+				    const struct urb *urb);
+
 static void retire_inbound_urb(struct snd_usb_endpoint *ep,
 			       struct snd_urb_ctx *urb_ctx)
 {
 	struct urb *urb = urb_ctx->urb;
+	struct snd_usb_endpoint *sync_sink;
 
 	if (unlikely(ep->skip_packets > 0)) {
 		ep->skip_packets--;
 		return;
 	}
 
-	if (ep->sync_slave)
-		snd_usb_handle_sync_urb(ep->sync_slave, ep, urb);
+	sync_sink = READ_ONCE(ep->sync_sink);
+	if (sync_sink)
+		snd_usb_handle_sync_urb(sync_sink, ep, urb);
 
-	if (ep->retire_data_urb)
-		ep->retire_data_urb(ep->data_subs, urb);
+	call_retire_callback(ep, urb);
 }
 
 static void prepare_silent_urb(struct snd_usb_endpoint *ep,
@@ -211,13 +237,7 @@ static void prepare_silent_urb(struct snd_usb_endpoint *ep,
 		unsigned int length;
 		int counts;
 
-		if (ctx->packet_size[i])
-			counts = ctx->packet_size[i];
-		else if (ep->sync_master)
-			counts = snd_usb_endpoint_slave_next_packet_size(ep);
-		else
-			counts = snd_usb_endpoint_next_packet_size(ep);
-
+		counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
 		length = counts * ep->stride; /* number of silent bytes */
 		offset = offs * ep->stride + extra * i;
 		urb->iso_frame_desc[i].offset = offset;
@@ -244,17 +264,17 @@ static void prepare_outbound_urb(struct snd_usb_endpoint *ep,
 {
 	struct urb *urb = ctx->urb;
 	unsigned char *cp = urb->transfer_buffer;
+	struct snd_usb_substream *data_subs;
 
 	urb->dev = ep->chip->dev; /* we need to set this at each time */
 
 	switch (ep->type) {
 	case SND_USB_ENDPOINT_TYPE_DATA:
-		if (ep->prepare_data_urb) {
-			ep->prepare_data_urb(ep->data_subs, urb);
-		} else {
-			/* no data provider, so send silence */
+		data_subs = READ_ONCE(ep->data_subs);
+		if (data_subs && ep->prepare_data_urb)
+			ep->prepare_data_urb(data_subs, urb);
+		else /* no data provider, so send silence */
 			prepare_silent_urb(ep, ctx);
-		}
 		break;
 
 	case SND_USB_ENDPOINT_TYPE_SYNC:
@@ -316,6 +336,39 @@ static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,
 	}
 }
 
+/* notify an error as XRUN to the assigned PCM data substream */
+static void notify_xrun(struct snd_usb_endpoint *ep)
+{
+	struct snd_usb_substream *data_subs;
+
+	data_subs = READ_ONCE(ep->data_subs);
+	if (data_subs && data_subs->pcm_substream)
+		snd_pcm_stop_xrun(data_subs->pcm_substream);
+}
+
+static struct snd_usb_packet_info *
+next_packet_fifo_enqueue(struct snd_usb_endpoint *ep)
+{
+	struct snd_usb_packet_info *p;
+
+	p = ep->next_packet + (ep->next_packet_head + ep->next_packet_queued) %
+		ARRAY_SIZE(ep->next_packet);
+	ep->next_packet_queued++;
+	return p;
+}
+
+static struct snd_usb_packet_info *
+next_packet_fifo_dequeue(struct snd_usb_endpoint *ep)
+{
+	struct snd_usb_packet_info *p;
+
+	p = ep->next_packet + ep->next_packet_head;
+	ep->next_packet_head++;
+	ep->next_packet_head %= ARRAY_SIZE(ep->next_packet);
+	ep->next_packet_queued--;
+	return p;
+}
+
 /*
  * Send output urbs that have been prepared previously. URBs are dequeued
  * from ep->ready_playback_urbs and in case there aren't any available
@@ -340,17 +393,14 @@ static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
 		int err, i;
 
 		spin_lock_irqsave(&ep->lock, flags);
-		if (ep->next_packet_read_pos != ep->next_packet_write_pos) {
-			packet = ep->next_packet + ep->next_packet_read_pos;
-			ep->next_packet_read_pos++;
-			ep->next_packet_read_pos %= MAX_URBS;
-
+		if (ep->next_packet_queued > 0 &&
+		    !list_empty(&ep->ready_playback_urbs)) {
 			/* take URB out of FIFO */
-			if (!list_empty(&ep->ready_playback_urbs)) {
-				ctx = list_first_entry(&ep->ready_playback_urbs,
+			ctx = list_first_entry(&ep->ready_playback_urbs,
 					       struct snd_urb_ctx, ready_list);
-				list_del_init(&ctx->ready_list);
-			}
+			list_del_init(&ctx->ready_list);
+
+			packet = next_packet_fifo_dequeue(ep);
 		}
 		spin_unlock_irqrestore(&ep->lock, flags);
 
@@ -365,12 +415,15 @@ static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
 		prepare_outbound_urb(ep, ctx);
 
 		err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
-		if (err < 0)
+		if (err < 0) {
 			usb_audio_err(ep->chip,
-				"Unable to submit urb #%d: %d (urb %p)\n",
-				ctx->index, err, ctx->urb);
-		else
-			set_bit(ctx->index, &ep->active_mask);
+				      "Unable to submit urb #%d: %d at %s\n",
+				      ctx->index, err, __func__);
+			notify_xrun(ep);
+			return;
+		}
+
+		set_bit(ctx->index, &ep->active_mask);
 	}
 }
 
@@ -381,7 +434,6 @@ static void snd_complete_urb(struct urb *urb)
 {
 	struct snd_urb_ctx *ctx = urb->context;
 	struct snd_usb_endpoint *ep = ctx->ep;
-	struct snd_pcm_substream *substream;
 	unsigned long flags;
 	int err;
 
@@ -406,10 +458,10 @@ static void snd_complete_urb(struct urb *urb)
 		if (snd_usb_endpoint_implicit_feedback_sink(ep)) {
 			spin_lock_irqsave(&ep->lock, flags);
 			list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
+			clear_bit(ctx->index, &ep->active_mask);
 			spin_unlock_irqrestore(&ep->lock, flags);
 			queue_pending_output_urbs(ep);
-
-			goto exit_clear;
+			return;
 		}
 
 		prepare_outbound_urb(ep, ctx);
@@ -430,27 +482,43 @@ static void snd_complete_urb(struct urb *urb)
 		return;
 
 	usb_audio_err(ep->chip, "cannot submit urb (err = %d)\n", err);
-	if (ep->data_subs && ep->data_subs->pcm_substream) {
-		substream = ep->data_subs->pcm_substream;
-		snd_pcm_stop_xrun(substream);
-	}
+	notify_xrun(ep);
 
 exit_clear:
 	clear_bit(ctx->index, &ep->active_mask);
 }
 
+/*
+ * Get the existing endpoint object corresponding EP
+ * Returns NULL if not present.
+ */
+struct snd_usb_endpoint *
+snd_usb_get_endpoint(struct snd_usb_audio *chip, int ep_num)
+{
+	struct snd_usb_endpoint *ep;
+
+	list_for_each_entry(ep, &chip->ep_list, list) {
+		if (ep->ep_num == ep_num)
+			return ep;
+	}
+
+	return NULL;
+}
+
+#define ep_type_name(type) \
+	(type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync")
+
 /**
  * snd_usb_add_endpoint: Add an endpoint to an USB audio chip
  *
  * @chip: The chip
- * @alts: The USB host interface
  * @ep_num: The number of the endpoint to use
- * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE
  * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC
  *
  * If the requested endpoint has not been added to the given chip before,
- * a new instance is created. Otherwise, a pointer to the previoulsy
- * created instance is returned. In case of any error, NULL is returned.
+ * a new instance is created.
+ *
+ * Returns zero on success or a negative error code.
  *
  * New endpoints will be added to chip->ep_list and must be freed by
  * calling snd_usb_endpoint_free().
@@ -458,79 +526,258 @@ exit_clear:
  * For SND_USB_ENDPOINT_TYPE_SYNC, the caller needs to guarantee that
  * bNumEndpoints > 1 beforehand.
  */
-struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
-					      struct usb_host_interface *alts,
-					      int ep_num, int direction, int type)
+int snd_usb_add_endpoint(struct snd_usb_audio *chip, int ep_num, int type)
 {
 	struct snd_usb_endpoint *ep;
-	int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK;
+	bool is_playback;
 
-	if (WARN_ON(!alts))
-		return NULL;
-
-	mutex_lock(&chip->mutex);
-
-	list_for_each_entry(ep, &chip->ep_list, list) {
-		if (ep->ep_num == ep_num &&
-		    ep->iface == alts->desc.bInterfaceNumber &&
-		    ep->altsetting == alts->desc.bAlternateSetting) {
-			usb_audio_dbg(ep->chip,
-				      "Re-using EP %x in iface %d,%d @%p\n",
-					ep_num, ep->iface, ep->altsetting, ep);
-			goto __exit_unlock;
-		}
-	}
-
-	usb_audio_dbg(chip, "Creating new %s %s endpoint #%x\n",
-		    is_playback ? "playback" : "capture",
-		    type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync",
-		    ep_num);
+	ep = snd_usb_get_endpoint(chip, ep_num);
+	if (ep)
+		return 0;
 
+	usb_audio_dbg(chip, "Creating new %s endpoint #%x\n",
+		      ep_type_name(type),
+		      ep_num);
 	ep = kzalloc(sizeof(*ep), GFP_KERNEL);
 	if (!ep)
-		goto __exit_unlock;
+		return -ENOMEM;
 
 	ep->chip = chip;
 	spin_lock_init(&ep->lock);
 	ep->type = type;
 	ep->ep_num = ep_num;
-	ep->iface = alts->desc.bInterfaceNumber;
-	ep->altsetting = alts->desc.bAlternateSetting;
 	INIT_LIST_HEAD(&ep->ready_playback_urbs);
-	ep_num &= USB_ENDPOINT_NUMBER_MASK;
 
+	is_playback = ((ep_num & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT);
+	ep_num &= USB_ENDPOINT_NUMBER_MASK;
 	if (is_playback)
 		ep->pipe = usb_sndisocpipe(chip->dev, ep_num);
 	else
 		ep->pipe = usb_rcvisocpipe(chip->dev, ep_num);
 
-	if (type == SND_USB_ENDPOINT_TYPE_SYNC) {
-		if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
-		    get_endpoint(alts, 1)->bRefresh >= 1 &&
-		    get_endpoint(alts, 1)->bRefresh <= 9)
-			ep->syncinterval = get_endpoint(alts, 1)->bRefresh;
-		else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL)
-			ep->syncinterval = 1;
-		else if (get_endpoint(alts, 1)->bInterval >= 1 &&
-			 get_endpoint(alts, 1)->bInterval <= 16)
-			ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
-		else
-			ep->syncinterval = 3;
-
-		ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
-	}
-
 	list_add_tail(&ep->list, &chip->ep_list);
+	return 0;
+}
+
+/* Set up syncinterval and maxsyncsize for a sync EP */
+static void endpoint_set_syncinterval(struct snd_usb_audio *chip,
+				      struct snd_usb_endpoint *ep)
+{
+	struct usb_host_interface *alts;
+	struct usb_endpoint_descriptor *desc;
+
+	alts = snd_usb_get_host_interface(chip, ep->iface, ep->altsetting);
+	if (!alts)
+		return;
+
+	desc = get_endpoint(alts, ep->ep_idx);
+	if (desc->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
+	    desc->bRefresh >= 1 && desc->bRefresh <= 9)
+		ep->syncinterval = desc->bRefresh;
+	else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL)
+		ep->syncinterval = 1;
+	else if (desc->bInterval >= 1 && desc->bInterval <= 16)
+		ep->syncinterval = desc->bInterval - 1;
+	else
+		ep->syncinterval = 3;
+
+	ep->syncmaxsize = le16_to_cpu(desc->wMaxPacketSize);
+}
 
-	ep->is_implicit_feedback = 0;
+static bool endpoint_compatible(struct snd_usb_endpoint *ep,
+				const struct audioformat *fp,
+				const struct snd_pcm_hw_params *params)
+{
+	if (!ep->opened)
+		return false;
+	if (ep->cur_audiofmt != fp)
+		return false;
+	if (ep->cur_rate != params_rate(params) ||
+	    ep->cur_format != params_format(params) ||
+	    ep->cur_period_frames != params_period_size(params) ||
+	    ep->cur_buffer_periods != params_periods(params))
+		return false;
+	return true;
+}
+
+/*
+ * Check whether the given fp and hw params are compatbile with the current
+ * setup of the target EP for implicit feedback sync
+ */
+bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip,
+				 struct snd_usb_endpoint *ep,
+				 const struct audioformat *fp,
+				 const struct snd_pcm_hw_params *params)
+{
+	bool ret;
 
-__exit_unlock:
+	mutex_lock(&chip->mutex);
+	ret = endpoint_compatible(ep, fp, params);
 	mutex_unlock(&chip->mutex);
+	return ret;
+}
 
+/*
+ * snd_usb_endpoint_open: Open the endpoint
+ *
+ * Called from hw_params to assign the endpoint to the substream.
+ * It's reference-counted, and only the first opener is allowed to set up
+ * arbitrary parameters.  The later opener must be compatible with the
+ * former opened parameters.
+ * The endpoint needs to be closed via snd_usb_endpoint_close() later.
+ *
+ * Note that this function doesn't configure the endpoint.  The substream
+ * needs to set it up later via snd_usb_endpoint_configure().
+ */
+struct snd_usb_endpoint *
+snd_usb_endpoint_open(struct snd_usb_audio *chip,
+		      const struct audioformat *fp,
+		      const struct snd_pcm_hw_params *params,
+		      bool is_sync_ep)
+{
+	struct snd_usb_endpoint *ep;
+	int ep_num = is_sync_ep ? fp->sync_ep : fp->endpoint;
+
+	mutex_lock(&chip->mutex);
+	ep = snd_usb_get_endpoint(chip, ep_num);
+	if (!ep) {
+		usb_audio_err(chip, "Cannot find EP 0x%x to open\n", ep_num);
+		goto unlock;
+	}
+
+	if (!ep->opened) {
+		if (is_sync_ep) {
+			ep->iface = fp->sync_iface;
+			ep->altsetting = fp->sync_altsetting;
+			ep->ep_idx = fp->sync_ep_idx;
+		} else {
+			ep->iface = fp->iface;
+			ep->altsetting = fp->altsetting;
+			ep->ep_idx = 0;
+		}
+		usb_audio_dbg(chip, "Open EP 0x%x, iface=%d:%d, idx=%d\n",
+			      ep_num, ep->iface, ep->altsetting, ep->ep_idx);
+
+		ep->cur_audiofmt = fp;
+		ep->cur_channels = fp->channels;
+		ep->cur_rate = params_rate(params);
+		ep->cur_format = params_format(params);
+		ep->cur_frame_bytes = snd_pcm_format_physical_width(ep->cur_format) *
+			ep->cur_channels / 8;
+		ep->cur_period_frames = params_period_size(params);
+		ep->cur_period_bytes = ep->cur_period_frames * ep->cur_frame_bytes;
+		ep->cur_buffer_periods = params_periods(params);
+
+		if (ep->type == SND_USB_ENDPOINT_TYPE_SYNC)
+			endpoint_set_syncinterval(chip, ep);
+
+		ep->implicit_fb_sync = fp->implicit_fb;
+		ep->need_setup = true;
+
+		usb_audio_dbg(chip, "  channels=%d, rate=%d, format=%s, period_bytes=%d, periods=%d, implicit_fb=%d\n",
+			      ep->cur_channels, ep->cur_rate,
+			      snd_pcm_format_name(ep->cur_format),
+			      ep->cur_period_bytes, ep->cur_buffer_periods,
+			      ep->implicit_fb_sync);
+
+	} else {
+		if (!endpoint_compatible(ep, fp, params)) {
+			usb_audio_err(chip, "Incompatible EP setup for 0x%x\n",
+				      ep_num);
+			ep = NULL;
+			goto unlock;
+		}
+
+		usb_audio_dbg(chip, "Reopened EP 0x%x (count %d)\n",
+			      ep_num, ep->opened);
+	}
+
+	ep->opened++;
+
+ unlock:
+	mutex_unlock(&chip->mutex);
 	return ep;
 }
 
 /*
+ * snd_usb_endpoint_set_sync: Link data and sync endpoints
+ *
+ * Pass NULL to sync_ep to unlink again
+ */
+void snd_usb_endpoint_set_sync(struct snd_usb_audio *chip,
+			       struct snd_usb_endpoint *data_ep,
+			       struct snd_usb_endpoint *sync_ep)
+{
+	data_ep->sync_source = sync_ep;
+}
+
+/*
+ * Set data endpoint callbacks and the assigned data stream
+ *
+ * Called at PCM trigger and cleanups.
+ * Pass NULL to deactivate each callback.
+ */
+void snd_usb_endpoint_set_callback(struct snd_usb_endpoint *ep,
+				   void (*prepare)(struct snd_usb_substream *subs,
+						   struct urb *urb),
+				   void (*retire)(struct snd_usb_substream *subs,
+						  struct urb *urb),
+				   struct snd_usb_substream *data_subs)
+{
+	ep->prepare_data_urb = prepare;
+	ep->retire_data_urb = retire;
+	WRITE_ONCE(ep->data_subs, data_subs);
+}
+
+static int endpoint_set_interface(struct snd_usb_audio *chip,
+				  struct snd_usb_endpoint *ep,
+				  bool set)
+{
+	int altset = set ? ep->altsetting : 0;
+	int err;
+
+	usb_audio_dbg(chip, "Setting usb interface %d:%d for EP 0x%x\n",
+		      ep->iface, altset, ep->ep_num);
+	err = usb_set_interface(chip->dev, ep->iface, altset);
+	if (err < 0) {
+		usb_audio_err(chip, "%d:%d: usb_set_interface failed (%d)\n",
+			      ep->iface, altset, err);
+		return err;
+	}
+
+	snd_usb_set_interface_quirk(chip);
+	return 0;
+}
+
+/*
+ * snd_usb_endpoint_close: Close the endpoint
+ *
+ * Unreference the already opened endpoint via snd_usb_endpoint_open().
+ */
+void snd_usb_endpoint_close(struct snd_usb_audio *chip,
+			    struct snd_usb_endpoint *ep)
+{
+	mutex_lock(&chip->mutex);
+	usb_audio_dbg(chip, "Closing EP 0x%x (count %d)\n",
+		      ep->ep_num, ep->opened);
+	if (!--ep->opened) {
+		endpoint_set_interface(chip, ep, false);
+		ep->iface = 0;
+		ep->altsetting = 0;
+		ep->cur_audiofmt = NULL;
+		ep->cur_rate = 0;
+		usb_audio_dbg(chip, "EP 0x%x closed\n", ep->ep_num);
+	}
+	mutex_unlock(&chip->mutex);
+}
+
+/* Prepare for suspening EP, called from the main suspend handler */
+void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep)
+{
+	ep->need_setup = true;
+}
+
+/*
  *  wait until all urbs are processed.
  */
 static int wait_clear_urbs(struct snd_usb_endpoint *ep)
@@ -538,6 +785,9 @@ static int wait_clear_urbs(struct snd_usb_endpoint *ep)
 	unsigned long end_time = jiffies + msecs_to_jiffies(1000);
 	int alive;
 
+	if (!test_bit(EP_FLAG_STOPPING, &ep->flags))
+		return 0;
+
 	do {
 		alive = bitmap_weight(&ep->active_mask, ep->nurbs);
 		if (!alive)
@@ -552,10 +802,8 @@ static int wait_clear_urbs(struct snd_usb_endpoint *ep)
 			alive, ep->ep_num);
 	clear_bit(EP_FLAG_STOPPING, &ep->flags);
 
-	ep->data_subs = NULL;
-	ep->sync_slave = NULL;
-	ep->retire_data_urb = NULL;
-	ep->prepare_data_urb = NULL;
+	ep->sync_sink = NULL;
+	snd_usb_endpoint_set_callback(ep, NULL, NULL, NULL);
 
 	return 0;
 }
@@ -565,25 +813,34 @@ static int wait_clear_urbs(struct snd_usb_endpoint *ep)
  */
 void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep)
 {
-	if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags))
+	if (ep)
 		wait_clear_urbs(ep);
 }
 
 /*
- * unlink active urbs.
+ * Stop and unlink active urbs.
+ *
+ * This function checks and clears EP_FLAG_RUNNING state.
+ * When @wait_sync is set, it waits until all pending URBs are killed.
  */
-static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force)
+static int stop_and_unlink_urbs(struct snd_usb_endpoint *ep, bool force,
+				bool wait_sync)
 {
 	unsigned int i;
 
 	if (!force && atomic_read(&ep->chip->shutdown)) /* to be sure... */
 		return -EBADFD;
 
-	clear_bit(EP_FLAG_RUNNING, &ep->flags);
+	if (atomic_read(&ep->running))
+		return -EBUSY;
 
+	if (!test_and_clear_bit(EP_FLAG_RUNNING, &ep->flags))
+		goto out;
+
+	set_bit(EP_FLAG_STOPPING, &ep->flags);
 	INIT_LIST_HEAD(&ep->ready_playback_urbs);
-	ep->next_packet_read_pos = 0;
-	ep->next_packet_write_pos = 0;
+	ep->next_packet_head = 0;
+	ep->next_packet_queued = 0;
 
 	for (i = 0; i < ep->nurbs; i++) {
 		if (test_bit(i, &ep->active_mask)) {
@@ -594,6 +851,9 @@ static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force)
 		}
 	}
 
+ out:
+	if (wait_sync)
+		return wait_clear_urbs(ep);
 	return 0;
 }
 
@@ -605,12 +865,10 @@ static void release_urbs(struct snd_usb_endpoint *ep, int force)
 	int i;
 
 	/* route incoming urbs to nirvana */
-	ep->retire_data_urb = NULL;
-	ep->prepare_data_urb = NULL;
+	snd_usb_endpoint_set_callback(ep, NULL, NULL, NULL);
 
 	/* stop urbs */
-	deactivate_urbs(ep, force);
-	wait_clear_urbs(ep);
+	stop_and_unlink_urbs(ep, force, true);
 
 	for (i = 0; i < ep->nurbs; i++)
 		release_urb_ctx(&ep->urb[i]);
@@ -623,209 +881,35 @@ static void release_urbs(struct snd_usb_endpoint *ep, int force)
 }
 
 /*
- * Check data endpoint for format differences
- */
-static bool check_ep_params(struct snd_usb_endpoint *ep,
-			      snd_pcm_format_t pcm_format,
-			      unsigned int channels,
-			      unsigned int period_bytes,
-			      unsigned int frames_per_period,
-			      unsigned int periods_per_buffer,
-			      struct audioformat *fmt,
-			      struct snd_usb_endpoint *sync_ep)
-{
-	unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
-	unsigned int max_packs_per_period, urbs_per_period, urb_packs;
-	unsigned int max_urbs;
-	int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
-	int tx_length_quirk = (ep->chip->tx_length_quirk &&
-			       usb_pipeout(ep->pipe));
-	bool ret = 1;
-
-	if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
-		/*
-		 * When operating in DSD DOP mode, the size of a sample frame
-		 * in hardware differs from the actual physical format width
-		 * because we need to make room for the DOP markers.
-		 */
-		frame_bits += channels << 3;
-	}
-
-	ret = ret && (ep->datainterval == fmt->datainterval);
-	ret = ret && (ep->stride == frame_bits >> 3);
-
-	switch (pcm_format) {
-	case SNDRV_PCM_FORMAT_U8:
-		ret = ret && (ep->silence_value == 0x80);
-		break;
-	case SNDRV_PCM_FORMAT_DSD_U8:
-	case SNDRV_PCM_FORMAT_DSD_U16_LE:
-	case SNDRV_PCM_FORMAT_DSD_U32_LE:
-	case SNDRV_PCM_FORMAT_DSD_U16_BE:
-	case SNDRV_PCM_FORMAT_DSD_U32_BE:
-		ret = ret && (ep->silence_value == 0x69);
-		break;
-	default:
-		ret = ret && (ep->silence_value == 0);
-	}
-
-	/* assume max. frequency is 50% higher than nominal */
-	ret = ret && (ep->freqmax == ep->freqn + (ep->freqn >> 1));
-	/* Round up freqmax to nearest integer in order to calculate maximum
-	 * packet size, which must represent a whole number of frames.
-	 * This is accomplished by adding 0x0.ffff before converting the
-	 * Q16.16 format into integer.
-	 * In order to accurately calculate the maximum packet size when
-	 * the data interval is more than 1 (i.e. ep->datainterval > 0),
-	 * multiply by the data interval prior to rounding. For instance,
-	 * a freqmax of 41 kHz will result in a max packet size of 6 (5.125)
-	 * frames with a data interval of 1, but 11 (10.25) frames with a
-	 * data interval of 2.
-	 * (ep->freqmax << ep->datainterval overflows at 8.192 MHz for the
-	 * maximum datainterval value of 3, at USB full speed, higher for
-	 * USB high speed, noting that ep->freqmax is in units of
-	 * frames per packet in Q16.16 format.)
-	 */
-	maxsize = (((ep->freqmax << ep->datainterval) + 0xffff) >> 16) *
-			 (frame_bits >> 3);
-	if (tx_length_quirk)
-		maxsize += sizeof(__le32); /* Space for length descriptor */
-	/* but wMaxPacketSize might reduce this */
-	if (ep->maxpacksize && ep->maxpacksize < maxsize) {
-		/* whatever fits into a max. size packet */
-		unsigned int data_maxsize = maxsize = ep->maxpacksize;
-
-		if (tx_length_quirk)
-			/* Need to remove the length descriptor to calc freq */
-			data_maxsize -= sizeof(__le32);
-		ret = ret && (ep->freqmax == (data_maxsize / (frame_bits >> 3))
-				<< (16 - ep->datainterval));
-	}
-
-	if (ep->fill_max)
-		ret = ret && (ep->curpacksize == ep->maxpacksize);
-	else
-		ret = ret && (ep->curpacksize == maxsize);
-
-	if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
-		packs_per_ms = 8 >> ep->datainterval;
-		max_packs_per_urb = MAX_PACKS_HS;
-	} else {
-		packs_per_ms = 1;
-		max_packs_per_urb = MAX_PACKS;
-	}
-	if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
-		max_packs_per_urb = min(max_packs_per_urb,
-					1U << sync_ep->syncinterval);
-	max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
-
-	/*
-	 * Capture endpoints need to use small URBs because there's no way
-	 * to tell in advance where the next period will end, and we don't
-	 * want the next URB to complete much after the period ends.
-	 *
-	 * Playback endpoints with implicit sync much use the same parameters
-	 * as their corresponding capture endpoint.
-	 */
-	if (usb_pipein(ep->pipe) ||
-			snd_usb_endpoint_implicit_feedback_sink(ep)) {
-
-		urb_packs = packs_per_ms;
-		/*
-		 * Wireless devices can poll at a max rate of once per 4ms.
-		 * For dataintervals less than 5, increase the packet count to
-		 * allow the host controller to use bursting to fill in the
-		 * gaps.
-		 */
-		if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
-			int interval = ep->datainterval;
-
-			while (interval < 5) {
-				urb_packs <<= 1;
-				++interval;
-			}
-		}
-		/* make capture URBs <= 1 ms and smaller than a period */
-		urb_packs = min(max_packs_per_urb, urb_packs);
-		while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
-			urb_packs >>= 1;
-		ret = ret && (ep->nurbs == MAX_URBS);
-
-	/*
-	 * Playback endpoints without implicit sync are adjusted so that
-	 * a period fits as evenly as possible in the smallest number of
-	 * URBs.  The total number of URBs is adjusted to the size of the
-	 * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits.
-	 */
-	} else {
-		/* determine how small a packet can be */
-		minsize = (ep->freqn >> (16 - ep->datainterval)) *
-				(frame_bits >> 3);
-		/* with sync from device, assume it can be 12% lower */
-		if (sync_ep)
-			minsize -= minsize >> 3;
-		minsize = max(minsize, 1u);
-
-		/* how many packets will contain an entire ALSA period? */
-		max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
-
-		/* how many URBs will contain a period? */
-		urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
-				max_packs_per_urb);
-		/* how many packets are needed in each URB? */
-		urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
-
-		/* limit the number of frames in a single URB */
-		ret = ret && (ep->max_urb_frames ==
-			DIV_ROUND_UP(frames_per_period, urbs_per_period));
-
-		/* try to use enough URBs to contain an entire ALSA buffer */
-		max_urbs = min((unsigned) MAX_URBS,
-				MAX_QUEUE * packs_per_ms / urb_packs);
-		ret = ret && (ep->nurbs == min(max_urbs,
-				urbs_per_period * periods_per_buffer));
-	}
-
-	ret = ret && (ep->datainterval == fmt->datainterval);
-	ret = ret && (ep->maxpacksize == fmt->maxpacksize);
-	ret = ret &&
-		(ep->fill_max == !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX));
-
-	return ret;
-}
-
-/*
  * configure a data endpoint
  */
-static int data_ep_set_params(struct snd_usb_endpoint *ep,
-			      snd_pcm_format_t pcm_format,
-			      unsigned int channels,
-			      unsigned int period_bytes,
-			      unsigned int frames_per_period,
-			      unsigned int periods_per_buffer,
-			      struct audioformat *fmt,
-			      struct snd_usb_endpoint *sync_ep)
+static int data_ep_set_params(struct snd_usb_endpoint *ep)
 {
+	struct snd_usb_audio *chip = ep->chip;
 	unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb;
 	unsigned int max_packs_per_period, urbs_per_period, urb_packs;
 	unsigned int max_urbs, i;
-	int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels;
-	int tx_length_quirk = (ep->chip->tx_length_quirk &&
+	const struct audioformat *fmt = ep->cur_audiofmt;
+	int frame_bits = ep->cur_frame_bytes * 8;
+	int tx_length_quirk = (chip->tx_length_quirk &&
 			       usb_pipeout(ep->pipe));
 
-	if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
+	usb_audio_dbg(chip, "Setting params for data EP 0x%x, pipe 0x%x\n",
+		      ep->ep_num, ep->pipe);
+
+	if (ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) {
 		/*
 		 * When operating in DSD DOP mode, the size of a sample frame
 		 * in hardware differs from the actual physical format width
 		 * because we need to make room for the DOP markers.
 		 */
-		frame_bits += channels << 3;
+		frame_bits += ep->cur_channels << 3;
 	}
 
 	ep->datainterval = fmt->datainterval;
 	ep->stride = frame_bits >> 3;
 
-	switch (pcm_format) {
+	switch (ep->cur_format) {
 	case SNDRV_PCM_FORMAT_U8:
 		ep->silence_value = 0x80;
 		break;
@@ -878,16 +962,16 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 	else
 		ep->curpacksize = maxsize;
 
-	if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) {
+	if (snd_usb_get_speed(chip->dev) != USB_SPEED_FULL) {
 		packs_per_ms = 8 >> ep->datainterval;
 		max_packs_per_urb = MAX_PACKS_HS;
 	} else {
 		packs_per_ms = 1;
 		max_packs_per_urb = MAX_PACKS;
 	}
-	if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep))
+	if (ep->sync_source && !ep->implicit_fb_sync)
 		max_packs_per_urb = min(max_packs_per_urb,
-					1U << sync_ep->syncinterval);
+					1U << ep->sync_source->syncinterval);
 	max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval);
 
 	/*
@@ -898,8 +982,7 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 	 * Playback endpoints with implicit sync much use the same parameters
 	 * as their corresponding capture endpoint.
 	 */
-	if (usb_pipein(ep->pipe) ||
-			snd_usb_endpoint_implicit_feedback_sink(ep)) {
+	if (usb_pipein(ep->pipe) || ep->implicit_fb_sync) {
 
 		urb_packs = packs_per_ms;
 		/*
@@ -908,7 +991,7 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 		 * allow the host controller to use bursting to fill in the
 		 * gaps.
 		 */
-		if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) {
+		if (snd_usb_get_speed(chip->dev) == USB_SPEED_WIRELESS) {
 			int interval = ep->datainterval;
 			while (interval < 5) {
 				urb_packs <<= 1;
@@ -917,7 +1000,7 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 		}
 		/* make capture URBs <= 1 ms and smaller than a period */
 		urb_packs = min(max_packs_per_urb, urb_packs);
-		while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
+		while (urb_packs > 1 && urb_packs * maxsize >= ep->cur_period_bytes)
 			urb_packs >>= 1;
 		ep->nurbs = MAX_URBS;
 
@@ -932,12 +1015,12 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 		minsize = (ep->freqn >> (16 - ep->datainterval)) *
 				(frame_bits >> 3);
 		/* with sync from device, assume it can be 12% lower */
-		if (sync_ep)
+		if (ep->sync_source)
 			minsize -= minsize >> 3;
 		minsize = max(minsize, 1u);
 
 		/* how many packets will contain an entire ALSA period? */
-		max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize);
+		max_packs_per_period = DIV_ROUND_UP(ep->cur_period_bytes, minsize);
 
 		/* how many URBs will contain a period? */
 		urbs_per_period = DIV_ROUND_UP(max_packs_per_period,
@@ -946,13 +1029,13 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 		urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period);
 
 		/* limit the number of frames in a single URB */
-		ep->max_urb_frames = DIV_ROUND_UP(frames_per_period,
-					urbs_per_period);
+		ep->max_urb_frames = DIV_ROUND_UP(ep->cur_period_frames,
+						  urbs_per_period);
 
 		/* try to use enough URBs to contain an entire ALSA buffer */
 		max_urbs = min((unsigned) MAX_URBS,
 				MAX_QUEUE * packs_per_ms / urb_packs);
-		ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer);
+		ep->nurbs = min(max_urbs, urbs_per_period * ep->cur_buffer_periods);
 	}
 
 	/* allocate and initialize data urbs */
@@ -970,7 +1053,7 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep,
 			goto out_of_memory;
 
 		u->urb->transfer_buffer =
-			usb_alloc_coherent(ep->chip->dev, u->buffer_size,
+			usb_alloc_coherent(chip->dev, u->buffer_size,
 					   GFP_KERNEL, &u->urb->transfer_dma);
 		if (!u->urb->transfer_buffer)
 			goto out_of_memory;
@@ -994,9 +1077,13 @@ out_of_memory:
  */
 static int sync_ep_set_params(struct snd_usb_endpoint *ep)
 {
+	struct snd_usb_audio *chip = ep->chip;
 	int i;
 
-	ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,
+	usb_audio_dbg(chip, "Setting params for sync EP 0x%x, pipe 0x%x\n",
+		      ep->ep_num, ep->pipe);
+
+	ep->syncbuf = usb_alloc_coherent(chip->dev, SYNC_URBS * 4,
 					 GFP_KERNEL, &ep->sync_dma);
 	if (!ep->syncbuf)
 		return -ENOMEM;
@@ -1029,55 +1116,19 @@ out_of_memory:
 	return -ENOMEM;
 }
 
-/**
+/*
  * snd_usb_endpoint_set_params: configure an snd_usb_endpoint
  *
- * @ep: the snd_usb_endpoint to configure
- * @pcm_format: the audio fomat.
- * @channels: the number of audio channels.
- * @period_bytes: the number of bytes in one alsa period.
- * @period_frames: the number of frames in one alsa period.
- * @buffer_periods: the number of periods in one alsa buffer.
- * @rate: the frame rate.
- * @fmt: the USB audio format information
- * @sync_ep: the sync endpoint to use, if any
- *
  * Determine the number of URBs to be used on this endpoint.
  * An endpoint must be configured before it can be started.
  * An endpoint that is already running can not be reconfigured.
  */
-int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
-				snd_pcm_format_t pcm_format,
-				unsigned int channels,
-				unsigned int period_bytes,
-				unsigned int period_frames,
-				unsigned int buffer_periods,
-				unsigned int rate,
-				struct audioformat *fmt,
-				struct snd_usb_endpoint *sync_ep)
+static int snd_usb_endpoint_set_params(struct snd_usb_audio *chip,
+				       struct snd_usb_endpoint *ep)
 {
+	const struct audioformat *fmt = ep->cur_audiofmt;
 	int err;
 
-	if (ep->use_count != 0) {
-		bool check = ep->is_implicit_feedback &&
-			check_ep_params(ep, pcm_format,
-					     channels, period_bytes,
-					     period_frames, buffer_periods,
-					     fmt, sync_ep);
-
-		if (!check) {
-			usb_audio_warn(ep->chip,
-				"Unable to change format on ep #%x: already in use\n",
-				ep->ep_num);
-			return -EBUSY;
-		}
-
-		usb_audio_dbg(ep->chip,
-			      "Ep #%x already in use as implicit feedback but format not changed\n",
-			      ep->ep_num);
-		return 0;
-	}
-
 	/* release old buffers, if any */
 	release_urbs(ep, 0);
 
@@ -1085,17 +1136,17 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
 	ep->maxpacksize = fmt->maxpacksize;
 	ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX);
 
-	if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) {
-		ep->freqn = get_usb_full_speed_rate(rate);
+	if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) {
+		ep->freqn = get_usb_full_speed_rate(ep->cur_rate);
 		ep->pps = 1000 >> ep->datainterval;
 	} else {
-		ep->freqn = get_usb_high_speed_rate(rate);
+		ep->freqn = get_usb_high_speed_rate(ep->cur_rate);
 		ep->pps = 8000 >> ep->datainterval;
 	}
 
-	ep->sample_rem = rate % ep->pps;
-	ep->packsize[0] = rate / ep->pps;
-	ep->packsize[1] = (rate + (ep->pps - 1)) / ep->pps;
+	ep->sample_rem = ep->cur_rate % ep->pps;
+	ep->packsize[0] = ep->cur_rate / ep->pps;
+	ep->packsize[1] = (ep->cur_rate + (ep->pps - 1)) / ep->pps;
 
 	/* calculate the frequency in 16.16 format */
 	ep->freqm = ep->freqn;
@@ -1105,9 +1156,7 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
 
 	switch (ep->type) {
 	case  SND_USB_ENDPOINT_TYPE_DATA:
-		err = data_ep_set_params(ep, pcm_format, channels,
-					 period_bytes, period_frames,
-					 buffer_periods, fmt, sync_ep);
+		err = data_ep_set_params(ep);
 		break;
 	case  SND_USB_ENDPOINT_TYPE_SYNC:
 		err = sync_ep_set_params(ep);
@@ -1116,10 +1165,89 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
 		err = -EINVAL;
 	}
 
-	usb_audio_dbg(ep->chip,
-		"Setting params for ep #%x (type %d, %d urbs), ret=%d\n",
-		ep->ep_num, ep->type, ep->nurbs, err);
+	usb_audio_dbg(chip, "Set up %d URBS, ret=%d\n", ep->nurbs, err);
+
+	if (err < 0)
+		return err;
+
+	/* some unit conversions in runtime */
+	ep->maxframesize = ep->maxpacksize / ep->cur_frame_bytes;
+	ep->curframesize = ep->curpacksize / ep->cur_frame_bytes;
+
+	return 0;
+}
+
+/*
+ * snd_usb_endpoint_configure: Configure the endpoint
+ *
+ * This function sets up the EP to be fully usable state.
+ * It's called either from hw_params or prepare callback.
+ * The function checks need_setup flag, and perfoms nothing unless needed,
+ * so it's safe to call this multiple times.
+ *
+ * This returns zero if unchanged, 1 if the configuration has changed,
+ * or a negative error code.
+ */
+int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
+			       struct snd_usb_endpoint *ep)
+{
+	bool iface_first;
+	int err = 0;
+
+	mutex_lock(&chip->mutex);
+	if (!ep->need_setup)
+		goto unlock;
+
+	/* No need to (re-)configure the sync EP belonging to the same altset */
+	if (ep->ep_idx) {
+		err = snd_usb_endpoint_set_params(chip, ep);
+		if (err < 0)
+			goto unlock;
+		goto done;
+	}
+
+	/* Need to deselect altsetting at first */
+	endpoint_set_interface(chip, ep, false);
+
+	/* Some UAC1 devices (e.g. Yamaha THR10) need the host interface
+	 * to be set up before parameter setups
+	 */
+	iface_first = ep->cur_audiofmt->protocol == UAC_VERSION_1;
+	if (iface_first) {
+		err = endpoint_set_interface(chip, ep, true);
+		if (err < 0)
+			goto unlock;
+	}
+
+	err = snd_usb_init_pitch(chip, ep->cur_audiofmt);
+	if (err < 0)
+		goto unlock;
 
+	err = snd_usb_init_sample_rate(chip, ep->cur_audiofmt, ep->cur_rate);
+	if (err < 0)
+		goto unlock;
+
+	err = snd_usb_endpoint_set_params(chip, ep);
+	if (err < 0)
+		goto unlock;
+
+	err = snd_usb_select_mode_quirk(chip, ep->cur_audiofmt);
+	if (err < 0)
+		goto unlock;
+
+	/* for UAC2/3, enable the interface altset here at last */
+	if (!iface_first) {
+		err = endpoint_set_interface(chip, ep, true);
+		if (err < 0)
+			goto unlock;
+	}
+
+ done:
+	ep->need_setup = false;
+	err = 1;
+
+unlock:
+	mutex_unlock(&chip->mutex);
 	return err;
 }
 
@@ -1128,7 +1256,7 @@ int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
  *
  * @ep: the endpoint to start
  *
- * A call to this function will increment the use count of the endpoint.
+ * A call to this function will increment the running count of the endpoint.
  * In case it is not already running, the URBs for this endpoint will be
  * submitted. Otherwise, this function does nothing.
  *
@@ -1144,13 +1272,17 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
 	if (atomic_read(&ep->chip->shutdown))
 		return -EBADFD;
 
+	if (ep->sync_source)
+		WRITE_ONCE(ep->sync_source->sync_sink, ep);
+
+	usb_audio_dbg(ep->chip, "Starting %s EP 0x%x (running %d)\n",
+		      ep_type_name(ep->type), ep->ep_num,
+		      atomic_read(&ep->running));
+
 	/* already running? */
-	if (++ep->use_count != 1)
+	if (atomic_inc_return(&ep->running) != 1)
 		return 0;
 
-	/* just to be sure */
-	deactivate_urbs(ep, false);
-
 	ep->active_mask = 0;
 	ep->unlink_mask = 0;
 	ep->phase = 0;
@@ -1173,6 +1305,7 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
 			list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
 		}
 
+		usb_audio_dbg(ep->chip, "No URB submission due to implicit fb sync\n");
 		return 0;
 	}
 
@@ -1198,12 +1331,12 @@ int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
 		set_bit(i, &ep->active_mask);
 	}
 
+	usb_audio_dbg(ep->chip, "%d URBs submitted for EP 0x%x\n",
+		      ep->nurbs, ep->ep_num);
 	return 0;
 
 __error:
-	clear_bit(EP_FLAG_RUNNING, &ep->flags);
-	ep->use_count--;
-	deactivate_urbs(ep, false);
+	snd_usb_endpoint_stop(ep);
 	return -EPIPE;
 }
 
@@ -1212,7 +1345,7 @@ __error:
  *
  * @ep: the endpoint to stop (may be NULL)
  *
- * A call to this function will decrement the use count of the endpoint.
+ * A call to this function will decrement the running count of the endpoint.
  * In case the last user has requested the endpoint stop, the URBs will
  * actually be deactivated.
  *
@@ -1226,35 +1359,18 @@ void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep)
 	if (!ep)
 		return;
 
-	if (snd_BUG_ON(ep->use_count == 0))
-		return;
-
-	if (--ep->use_count == 0) {
-		deactivate_urbs(ep, false);
-		set_bit(EP_FLAG_STOPPING, &ep->flags);
-	}
-}
+	usb_audio_dbg(ep->chip, "Stopping %s EP 0x%x (running %d)\n",
+		      ep_type_name(ep->type), ep->ep_num,
+		      atomic_read(&ep->running));
 
-/**
- * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint
- *
- * @ep: the endpoint to deactivate
- *
- * If the endpoint is not currently in use, this functions will
- * deactivate its associated URBs.
- *
- * In case of any active users, this functions does nothing.
- */
-void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
-{
-	if (!ep)
+	if (snd_BUG_ON(!atomic_read(&ep->running)))
 		return;
 
-	if (ep->use_count != 0)
-		return;
+	if (ep->sync_source)
+		WRITE_ONCE(ep->sync_source->sync_sink, NULL);
 
-	deactivate_urbs(ep, true);
-	wait_clear_urbs(ep);
+	if (!atomic_dec_return(&ep->running))
+		stop_and_unlink_urbs(ep, false, false);
 }
 
 /**
@@ -1262,7 +1378,7 @@ void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
  *
  * @ep: the endpoint to release
  *
- * This function does not care for the endpoint's use count but will tear
+ * This function does not care for the endpoint's running count but will tear
  * down all the streaming URBs immediately.
  */
 void snd_usb_endpoint_release(struct snd_usb_endpoint *ep)
@@ -1282,7 +1398,7 @@ void snd_usb_endpoint_free(struct snd_usb_endpoint *ep)
 	kfree(ep);
 }
 
-/**
+/*
  * snd_usb_handle_sync_urb: parse an USB sync packet
  *
  * @ep: the endpoint to handle the packet
@@ -1292,9 +1408,9 @@ void snd_usb_endpoint_free(struct snd_usb_endpoint *ep)
  * This function is called from the context of an endpoint that received
  * the packet and is used to let another endpoint object handle the payload.
  */
-void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
-			     struct snd_usb_endpoint *sender,
-			     const struct urb *urb)
+static void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
+				    struct snd_usb_endpoint *sender,
+				    const struct urb *urb)
 {
 	int shift;
 	unsigned int f;
@@ -1309,7 +1425,7 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
 	 * will take care of them later.
 	 */
 	if (snd_usb_endpoint_implicit_feedback_sink(ep) &&
-	    ep->use_count != 0) {
+	    atomic_read(&ep->running)) {
 
 		/* implicit feedback case */
 		int i, bytes = 0;
@@ -1331,7 +1447,16 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
 			return;
 
 		spin_lock_irqsave(&ep->lock, flags);
-		out_packet = ep->next_packet + ep->next_packet_write_pos;
+		if (ep->next_packet_queued >= ARRAY_SIZE(ep->next_packet)) {
+			spin_unlock_irqrestore(&ep->lock, flags);
+			usb_audio_err(ep->chip,
+				      "next package FIFO overflow EP 0x%x\n",
+				      ep->ep_num);
+			notify_xrun(ep);
+			return;
+		}
+
+		out_packet = next_packet_fifo_enqueue(ep);
 
 		/*
 		 * Iterate through the inbound packet and prepare the lengths
@@ -1352,8 +1477,6 @@ void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
 				out_packet->packet_size[i] = 0;
 		}
 
-		ep->next_packet_write_pos++;
-		ep->next_packet_write_pos %= MAX_URBS;
 		spin_unlock_irqrestore(&ep->lock, flags);
 		queue_pending_output_urbs(ep);
 
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index d23fa0a8c11b..11e3bb839fd7 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -5,34 +5,47 @@
 #define SND_USB_ENDPOINT_TYPE_DATA     0
 #define SND_USB_ENDPOINT_TYPE_SYNC     1
 
-struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
-					      struct usb_host_interface *alts,
-					      int ep_num, int direction, int type);
-
-int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
-				snd_pcm_format_t pcm_format,
-				unsigned int channels,
-				unsigned int period_bytes,
-				unsigned int period_frames,
-				unsigned int buffer_periods,
-				unsigned int rate,
-				struct audioformat *fmt,
-				struct snd_usb_endpoint *sync_ep);
-
-int  snd_usb_endpoint_start(struct snd_usb_endpoint *ep);
+struct snd_usb_endpoint *snd_usb_get_endpoint(struct snd_usb_audio *chip,
+					      int ep_num);
+
+int snd_usb_add_endpoint(struct snd_usb_audio *chip, int ep_num, int type);
+
+struct snd_usb_endpoint *
+snd_usb_endpoint_open(struct snd_usb_audio *chip,
+		      const struct audioformat *fp,
+		      const struct snd_pcm_hw_params *params,
+		      bool is_sync_ep);
+void snd_usb_endpoint_close(struct snd_usb_audio *chip,
+			    struct snd_usb_endpoint *ep);
+int snd_usb_endpoint_configure(struct snd_usb_audio *chip,
+			       struct snd_usb_endpoint *ep);
+void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep);
+
+bool snd_usb_endpoint_compatible(struct snd_usb_audio *chip,
+				 struct snd_usb_endpoint *ep,
+				 const struct audioformat *fp,
+				 const struct snd_pcm_hw_params *params);
+
+void snd_usb_endpoint_set_sync(struct snd_usb_audio *chip,
+			       struct snd_usb_endpoint *data_ep,
+			       struct snd_usb_endpoint *sync_ep);
+void snd_usb_endpoint_set_callback(struct snd_usb_endpoint *ep,
+				   void (*prepare)(struct snd_usb_substream *subs,
+						   struct urb *urb),
+				   void (*retire)(struct snd_usb_substream *subs,
+						  struct urb *urb),
+				   struct snd_usb_substream *data_subs);
+
+int snd_usb_endpoint_start(struct snd_usb_endpoint *ep);
 void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep);
 void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep);
+void snd_usb_endpoint_suspend(struct snd_usb_endpoint *ep);
 int  snd_usb_endpoint_activate(struct snd_usb_endpoint *ep);
-void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep);
 void snd_usb_endpoint_release(struct snd_usb_endpoint *ep);
 void snd_usb_endpoint_free(struct snd_usb_endpoint *ep);
 
 int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep);
-int snd_usb_endpoint_slave_next_packet_size(struct snd_usb_endpoint *ep);
-int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep);
-
-void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
-			     struct snd_usb_endpoint *sender,
-			     const struct urb *urb);
+int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep,
+				      struct snd_urb_ctx *ctx, int idx);
 
 #endif /* __USBAUDIO_ENDPOINT_H */
diff --git a/sound/usb/format.c b/sound/usb/format.c
index 3bfead393aa3..93459ba228d3 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -16,7 +16,6 @@
 #include "card.h"
 #include "quirks.h"
 #include "helper.h"
-#include "debug.h"
 #include "clock.h"
 #include "format.h"
 
@@ -165,6 +164,23 @@ static int set_fixed_rate(struct audioformat *fp, int rate, int rate_bits)
 	return 0;
 }
 
+/* set up rate_min, rate_max and rates from the rate table */
+static void set_rate_table_min_max(struct audioformat *fp)
+{
+	unsigned int rate;
+	int i;
+
+	fp->rate_min = INT_MAX;
+	fp->rate_max = 0;
+	fp->rates = 0;
+	for (i = 0; i < fp->nr_rates; i++) {
+		rate = fp->rate_table[i];
+		fp->rate_min = min(fp->rate_min, rate);
+		fp->rate_max = max(fp->rate_max, rate);
+		fp->rates |= snd_pcm_rate_to_rate_bit(rate);
+	}
+}
+
 /*
  * parse the format descriptor and stores the possible sample rates
  * on the audioformat table (audio class v1).
@@ -199,7 +215,6 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
 			return -ENOMEM;
 
 		fp->nr_rates = 0;
-		fp->rate_min = fp->rate_max = 0;
 		for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
 			unsigned int rate = combine_triple(&fmt[idx]);
 			if (!rate)
@@ -218,18 +233,15 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
 			     chip->usb_id == USB_ID(0x041e, 0x4068)))
 				rate = 8000;
 
-			fp->rate_table[fp->nr_rates] = rate;
-			if (!fp->rate_min || rate < fp->rate_min)
-				fp->rate_min = rate;
-			if (!fp->rate_max || rate > fp->rate_max)
-				fp->rate_max = rate;
-			fp->rates |= snd_pcm_rate_to_rate_bit(rate);
-			fp->nr_rates++;
+			fp->rate_table[fp->nr_rates++] = rate;
 		}
 		if (!fp->nr_rates) {
-			hwc_debug("All rates were zero. Skipping format!\n");
+			usb_audio_info(chip,
+				       "%u:%d: All rates were zero\n",
+				       fp->iface, fp->altsetting);
 			return -EINVAL;
 		}
+		set_rate_table_min_max(fp);
 	} else {
 		/* continuous rates */
 		fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
@@ -335,8 +347,6 @@ static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
 {
 	int i, nr_rates = 0;
 
-	fp->rates = fp->rate_min = fp->rate_max = 0;
-
 	for (i = 0; i < nr_triplets; i++) {
 		int min = combine_quad(&data[2 + 12 * i]);
 		int max = combine_quad(&data[6 + 12 * i]);
@@ -372,12 +382,6 @@ static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
 
 			if (fp->rate_table)
 				fp->rate_table[nr_rates] = rate;
-			if (!fp->rate_min || rate < fp->rate_min)
-				fp->rate_min = rate;
-			if (!fp->rate_max || rate > fp->rate_max)
-				fp->rate_max = rate;
-			fp->rates |= snd_pcm_rate_to_rate_bit(rate);
-
 			nr_rates++;
 			if (nr_rates >= MAX_NR_RATES) {
 				usb_audio_err(chip, "invalid uac2 rates\n");
@@ -417,6 +421,85 @@ static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
 	return -ENODEV;
 }
 
+/* check whether the given altsetting is supported for the already set rate */
+static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface,
+					int altsetting)
+{
+	struct usb_device *dev = chip->dev;
+	__le64 raw_data = 0;
+	u64 data;
+	int err;
+
+	/* we assume 64bit is enough for any altsettings */
+	if (snd_BUG_ON(altsetting >= 64 - 8))
+		return false;
+
+	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
+			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
+			      UAC2_AS_VAL_ALT_SETTINGS << 8,
+			      iface, &raw_data, sizeof(raw_data));
+	if (err < 0)
+		return false;
+
+	data = le64_to_cpu(raw_data);
+	/* first byte contains the bitmap size */
+	if ((data & 0xff) * 8 < altsetting)
+		return false;
+	if (data & (1ULL << (altsetting + 8)))
+		return true;
+
+	return false;
+}
+
+/*
+ * Validate each sample rate with the altsetting
+ * Rebuild the rate table if only partial values are valid
+ */
+static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
+					   struct audioformat *fp,
+					   int clock)
+{
+	struct usb_device *dev = chip->dev;
+	unsigned int *table;
+	unsigned int nr_rates;
+	int i, err;
+
+	table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL);
+	if (!table)
+		return -ENOMEM;
+
+	/* clear the interface altsetting at first */
+	usb_set_interface(dev, fp->iface, 0);
+
+	nr_rates = 0;
+	for (i = 0; i < fp->nr_rates; i++) {
+		err = snd_usb_set_sample_rate_v2v3(chip, fp, clock,
+						   fp->rate_table[i]);
+		if (err < 0)
+			continue;
+
+		if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting))
+			table[nr_rates++] = fp->rate_table[i];
+	}
+
+	if (!nr_rates) {
+		usb_audio_dbg(chip,
+			      "No valid sample rate available for %d:%d, assuming a firmware bug\n",
+			      fp->iface, fp->altsetting);
+		nr_rates = fp->nr_rates; /* continue as is */
+	}
+
+	if (fp->nr_rates == nr_rates) {
+		kfree(table);
+		return 0;
+	}
+
+	kfree(fp->rate_table);
+	fp->rate_table = table;
+	fp->nr_rates = nr_rates;
+	return 0;
+}
+
 /*
  * parse the format descriptor and stores the possible sample rates
  * on the audioformat table (audio class v2 and v3).
@@ -509,6 +592,12 @@ static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
 	 * allocated, so the rates will be stored */
 	parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
 
+	ret = validate_sample_rate_table_v2v3(chip, fp, clock);
+	if (ret < 0)
+		goto err_free;
+
+	set_rate_table_min_max(fp);
+
 err_free:
 	kfree(data);
 err:
diff --git a/sound/usb/helper.c b/sound/usb/helper.c
index cf92d7110773..a4410267bf70 100644
--- a/sound/usb/helper.c
+++ b/sound/usb/helper.c
@@ -121,3 +121,13 @@ unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
 	return 0;
 }
 
+struct usb_host_interface *
+snd_usb_get_host_interface(struct snd_usb_audio *chip, int ifnum, int altsetting)
+{
+	struct usb_interface *iface;
+
+	iface = usb_ifnum_to_if(chip->dev, ifnum);
+	if (!iface)
+		return NULL;
+	return usb_altnum_to_altsetting(iface, altsetting);
+}
diff --git a/sound/usb/helper.h b/sound/usb/helper.h
index f5b4c6647e4d..e2b51ec96ec6 100644
--- a/sound/usb/helper.h
+++ b/sound/usb/helper.h
@@ -14,6 +14,9 @@ int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe,
 unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
 					 struct usb_host_interface *alts);
 
+struct usb_host_interface *
+snd_usb_get_host_interface(struct snd_usb_audio *chip, int ifnum, int altsetting);
+
 /*
  * retrieve usb_interface descriptor from the host interface
  * (conditional for compatibility with the older API)
diff --git a/sound/usb/implicit.c b/sound/usb/implicit.c
new file mode 100644
index 000000000000..386198b36b87
--- /dev/null
+++ b/sound/usb/implicit.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// Special handling for implicit feedback mode
+//
+
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/usb/audio.h>
+#include <linux/usb/audio-v2.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+
+#include "usbaudio.h"
+#include "card.h"
+#include "helper.h"
+#include "implicit.h"
+
+enum {
+	IMPLICIT_FB_NONE,
+	IMPLICIT_FB_GENERIC,
+	IMPLICIT_FB_FIXED,
+};
+
+struct snd_usb_implicit_fb_match {
+	unsigned int id;
+	unsigned int iface_class;
+	unsigned int ep_num;
+	unsigned int iface;
+	int type;
+};
+
+#define IMPLICIT_FB_GENERIC_DEV(vend, prod) \
+	{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_GENERIC }
+#define IMPLICIT_FB_FIXED_DEV(vend, prod, ep, ifnum) \
+	{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_FIXED, .ep_num = (ep),\
+	    .iface = (ifnum) }
+#define IMPLICIT_FB_SKIP_DEV(vend, prod) \
+	{ .id = USB_ID(vend, prod), .type = IMPLICIT_FB_NONE }
+
+/* Implicit feedback quirk table for playback */
+static const struct snd_usb_implicit_fb_match playback_implicit_fb_quirks[] = {
+	/* Generic matching */
+	IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2080), /* M-Audio FastTrack Ultra */
+	IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2081), /* M-Audio FastTrack Ultra */
+	IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2030), /* M-Audio Fast Track C400 */
+	IMPLICIT_FB_GENERIC_DEV(0x0763, 0x2031), /* M-Audio Fast Track C600 */
+
+	/* Fixed EP */
+	/* FIXME: check the availability of generic matching */
+	IMPLICIT_FB_FIXED_DEV(0x1397, 0x0001, 0x81, 1), /* Behringer UFX1604 */
+	IMPLICIT_FB_FIXED_DEV(0x1397, 0x0002, 0x81, 1), /* Behringer UFX1204 */
+	IMPLICIT_FB_FIXED_DEV(0x2466, 0x8010, 0x81, 2), /* Fractal Audio Axe-Fx III */
+	IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0001, 0x81, 2), /* Solid State Logic SSL2 */
+	IMPLICIT_FB_FIXED_DEV(0x31e9, 0x0002, 0x81, 2), /* Solid State Logic SSL2+ */
+	IMPLICIT_FB_FIXED_DEV(0x0499, 0x172f, 0x81, 2), /* Steinberg UR22C */
+	IMPLICIT_FB_FIXED_DEV(0x0d9a, 0x00df, 0x81, 2), /* RTX6001 */
+	IMPLICIT_FB_FIXED_DEV(0x22f0, 0x0006, 0x81, 3), /* Allen&Heath Qu-16 */
+	IMPLICIT_FB_FIXED_DEV(0x2b73, 0x000a, 0x82, 0), /* Pioneer DJ DJM-900NXS2 */
+	IMPLICIT_FB_FIXED_DEV(0x2b73, 0x0017, 0x82, 0), /* Pioneer DJ DJM-250MK2 */
+	IMPLICIT_FB_FIXED_DEV(0x1686, 0xf029, 0x82, 2), /* Zoom UAC-2 */
+	IMPLICIT_FB_FIXED_DEV(0x2466, 0x8003, 0x86, 2), /* Fractal Audio Axe-Fx II */
+	IMPLICIT_FB_FIXED_DEV(0x0499, 0x172a, 0x86, 2), /* Yamaha MODX */
+
+	/* Special matching */
+	{ .id = USB_ID(0x07fd, 0x0004), .iface_class = USB_CLASS_AUDIO,
+	  .type = IMPLICIT_FB_NONE },		/* MicroBook IIc */
+	/* ep = 0x84, ifnum = 0 */
+	{ .id = USB_ID(0x07fd, 0x0004), .iface_class = USB_CLASS_VENDOR_SPEC,
+	  .type = IMPLICIT_FB_FIXED,
+	  .ep_num = 0x84, .iface = 0 },		/* MOTU MicroBook II */
+
+	/* No quirk for playback but with capture quirk (see below) */
+	IMPLICIT_FB_SKIP_DEV(0x0582, 0x0130),	/* BOSS BR-80 */
+	IMPLICIT_FB_SKIP_DEV(0x0582, 0x0189),	/* BOSS GT-100v2 */
+	IMPLICIT_FB_SKIP_DEV(0x0582, 0x01d8),	/* BOSS Katana */
+	IMPLICIT_FB_SKIP_DEV(0x0582, 0x01e5),	/* BOSS GT-001 */
+
+	{} /* terminator */
+};
+
+/* Implicit feedback quirk table for capture: only FIXED type */
+static const struct snd_usb_implicit_fb_match capture_implicit_fb_quirks[] = {
+	IMPLICIT_FB_FIXED_DEV(0x0582, 0x0130, 0x0d, 0x01), /* BOSS BR-80 */
+	IMPLICIT_FB_FIXED_DEV(0x0582, 0x0189, 0x0d, 0x01), /* BOSS GT-100v2 */
+	IMPLICIT_FB_FIXED_DEV(0x0582, 0x01d8, 0x0d, 0x01), /* BOSS Katana */
+	IMPLICIT_FB_FIXED_DEV(0x0582, 0x01e5, 0x0d, 0x01), /* BOSS GT-001 */
+
+	{} /* terminator */
+};
+
+/* set up sync EP information on the audioformat */
+static int add_implicit_fb_sync_ep(struct snd_usb_audio *chip,
+				   struct audioformat *fmt,
+				   int ep, int ifnum,
+				   const struct usb_host_interface *alts)
+{
+	struct usb_interface *iface;
+
+	if (!alts) {
+		iface = usb_ifnum_to_if(chip->dev, ifnum);
+		if (!iface || iface->num_altsetting < 2)
+			return 0;
+		alts = &iface->altsetting[1];
+	}
+
+	fmt->sync_ep = ep;
+	fmt->sync_iface = ifnum;
+	fmt->sync_altsetting = alts->desc.bAlternateSetting;
+	fmt->sync_ep_idx = 0;
+	fmt->implicit_fb = 1;
+	usb_audio_dbg(chip,
+		      "%d:%d: added %s implicit_fb sync_ep %x, iface %d:%d\n",
+		      fmt->iface, fmt->altsetting,
+		      (ep & USB_DIR_IN) ? "playback" : "capture",
+		      fmt->sync_ep, fmt->sync_iface, fmt->sync_altsetting);
+	return 1;
+}
+
+/* Check whether the given UAC2 iface:altset points to an implicit fb source */
+static int add_generic_uac2_implicit_fb(struct snd_usb_audio *chip,
+					struct audioformat *fmt,
+					unsigned int ifnum,
+					unsigned int altsetting)
+{
+	struct usb_host_interface *alts;
+	struct usb_endpoint_descriptor *epd;
+
+	alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
+	if (!alts)
+		return 0;
+	if (alts->desc.bInterfaceClass != USB_CLASS_AUDIO ||
+	    alts->desc.bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING ||
+	    alts->desc.bInterfaceProtocol != UAC_VERSION_2 ||
+	    alts->desc.bNumEndpoints < 1)
+		return 0;
+	epd = get_endpoint(alts, 0);
+	if (!usb_endpoint_is_isoc_in(epd) ||
+	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
+					USB_ENDPOINT_USAGE_IMPLICIT_FB)
+		return 0;
+	return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress,
+				       ifnum, alts);
+}
+
+/* Like the function above, but specific to Roland with vendor class and hack */
+static int add_roland_implicit_fb(struct snd_usb_audio *chip,
+				  struct audioformat *fmt,
+				  unsigned int ifnum,
+				  unsigned int altsetting)
+{
+	struct usb_host_interface *alts;
+	struct usb_endpoint_descriptor *epd;
+
+	alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
+	if (!alts)
+		return 0;
+	if (alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
+	    (alts->desc.bInterfaceSubClass != 2 &&
+	     alts->desc.bInterfaceProtocol != 2) ||
+	    alts->desc.bNumEndpoints < 1)
+		return 0;
+	epd = get_endpoint(alts, 0);
+	if (!usb_endpoint_is_isoc_in(epd) ||
+	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
+					USB_ENDPOINT_USAGE_IMPLICIT_FB)
+		return 0;
+	return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress,
+				       ifnum, alts);
+}
+
+
+static int __add_generic_implicit_fb(struct snd_usb_audio *chip,
+				     struct audioformat *fmt,
+				     int iface, int altset)
+{
+	struct usb_host_interface *alts;
+	struct usb_endpoint_descriptor *epd;
+
+	alts = snd_usb_get_host_interface(chip, iface, altset);
+	if (!alts)
+		return 0;
+
+	if ((alts->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC &&
+	     alts->desc.bInterfaceClass != USB_CLASS_AUDIO) ||
+	    alts->desc.bNumEndpoints < 1)
+		return 0;
+	epd = get_endpoint(alts, 0);
+	if (!usb_endpoint_is_isoc_in(epd) ||
+	    (epd->bmAttributes & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
+		return 0;
+	return add_implicit_fb_sync_ep(chip, fmt, epd->bEndpointAddress,
+				       iface, alts);
+}
+
+/* More generic quirk: look for the sync EP next to the data EP */
+static int add_generic_implicit_fb(struct snd_usb_audio *chip,
+				   struct audioformat *fmt,
+				   struct usb_host_interface *alts)
+{
+	if ((fmt->ep_attr & USB_ENDPOINT_SYNCTYPE) != USB_ENDPOINT_SYNC_ASYNC)
+		return 0;
+
+	if (__add_generic_implicit_fb(chip, fmt,
+				      alts->desc.bInterfaceNumber + 1,
+				      alts->desc.bAlternateSetting))
+		return 1;
+	return __add_generic_implicit_fb(chip, fmt,
+					 alts->desc.bInterfaceNumber - 1,
+					 alts->desc.bAlternateSetting);
+}
+
+static const struct snd_usb_implicit_fb_match *
+find_implicit_fb_entry(struct snd_usb_audio *chip,
+		       const struct snd_usb_implicit_fb_match *match,
+		       const struct usb_host_interface *alts)
+{
+	for (; match->id; match++)
+		if (match->id == chip->usb_id &&
+		    (!match->iface_class ||
+		     (alts->desc.bInterfaceClass == match->iface_class)))
+			return match;
+
+	return NULL;
+}
+
+/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
+ * applies. Returns 1 if a quirk was found.
+ */
+static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip,
+					 struct audioformat *fmt,
+					 struct usb_host_interface *alts)
+{
+	const struct snd_usb_implicit_fb_match *p;
+	unsigned int attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
+
+	p = find_implicit_fb_entry(chip, playback_implicit_fb_quirks, alts);
+	if (p) {
+		switch (p->type) {
+		case IMPLICIT_FB_GENERIC:
+			return add_generic_implicit_fb(chip, fmt, alts);
+		case IMPLICIT_FB_NONE:
+			return 0; /* No quirk */
+		case IMPLICIT_FB_FIXED:
+			return add_implicit_fb_sync_ep(chip, fmt, p->ep_num,
+						       p->iface, NULL);
+		}
+	}
+
+	/* Generic UAC2 implicit feedback */
+	if (attr == USB_ENDPOINT_SYNC_ASYNC &&
+	    alts->desc.bInterfaceClass == USB_CLASS_AUDIO &&
+	    alts->desc.bInterfaceProtocol == UAC_VERSION_2 &&
+	    alts->desc.bNumEndpoints == 1) {
+		if (add_generic_uac2_implicit_fb(chip, fmt,
+						 alts->desc.bInterfaceNumber + 1,
+						 alts->desc.bAlternateSetting))
+			return 1;
+	}
+
+	/* Roland/BOSS implicit feedback with vendor spec class */
+	if (attr == USB_ENDPOINT_SYNC_ASYNC &&
+	    alts->desc.bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
+	    alts->desc.bInterfaceProtocol == 2 &&
+	    alts->desc.bNumEndpoints == 1 &&
+	    USB_ID_VENDOR(chip->usb_id) == 0x0582 /* Roland */) {
+		if (add_roland_implicit_fb(chip, fmt,
+					   alts->desc.bInterfaceNumber + 1,
+					   alts->desc.bAlternateSetting))
+			return 1;
+	}
+
+	/* Try the generic implicit fb if available */
+	if (chip->generic_implicit_fb)
+		return add_generic_implicit_fb(chip, fmt, alts);
+
+	/* No quirk */
+	return 0;
+}
+
+/* same for capture, but only handling FIXED entry */
+static int audioformat_capture_quirk(struct snd_usb_audio *chip,
+				     struct audioformat *fmt,
+				     struct usb_host_interface *alts)
+{
+	const struct snd_usb_implicit_fb_match *p;
+
+	p = find_implicit_fb_entry(chip, capture_implicit_fb_quirks, alts);
+	if (p && p->type == IMPLICIT_FB_FIXED)
+		return add_implicit_fb_sync_ep(chip, fmt, p->ep_num, p->iface,
+					       NULL);
+	return 0;
+}
+
+/*
+ * Parse altset and set up implicit feedback endpoint on the audioformat
+ */
+int snd_usb_parse_implicit_fb_quirk(struct snd_usb_audio *chip,
+				    struct audioformat *fmt,
+				    struct usb_host_interface *alts)
+{
+	if (fmt->endpoint & USB_DIR_IN)
+		return audioformat_capture_quirk(chip, fmt, alts);
+	else
+		return audioformat_implicit_fb_quirk(chip, fmt, alts);
+}
+
+/*
+ * Return the score of matching two audioformats.
+ * Veto the audioformat if:
+ * - It has no channels for some reason.
+ * - Requested PCM format is not supported.
+ * - Requested sample rate is not supported.
+ */
+static int match_endpoint_audioformats(struct snd_usb_substream *subs,
+				       const struct audioformat *fp,
+				       int rate, int channels,
+				       snd_pcm_format_t pcm_format)
+{
+	int i, score;
+
+	if (fp->channels < 1)
+		return 0;
+
+	if (!(fp->formats & pcm_format_to_bits(pcm_format)))
+		return 0;
+
+	if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
+		if (rate < fp->rate_min || rate > fp->rate_max)
+			return 0;
+	} else {
+		for (i = 0; i < fp->nr_rates; i++) {
+			if (fp->rate_table[i] == rate)
+				break;
+		}
+		if (i >= fp->nr_rates)
+			return 0;
+	}
+
+	score = 1;
+	if (fp->channels == channels)
+		score++;
+
+	return score;
+}
+
+static struct snd_usb_substream *
+find_matching_substream(struct snd_usb_audio *chip, int stream, int ep_num,
+			int fmt_type)
+{
+	struct snd_usb_stream *as;
+	struct snd_usb_substream *subs;
+
+	list_for_each_entry(as, &chip->pcm_list, list) {
+		subs = &as->substream[stream];
+		if (as->fmt_type == fmt_type && subs->ep_num == ep_num)
+			return subs;
+	}
+
+	return NULL;
+}
+
+/*
+ * Return the audioformat that is suitable for the implicit fb
+ */
+const struct audioformat *
+snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip,
+				     const struct audioformat *target,
+				     const struct snd_pcm_hw_params *params,
+				     int stream)
+{
+	struct snd_usb_substream *subs;
+	const struct audioformat *fp, *sync_fmt;
+	int score, high_score;
+
+	/* When sharing the same altset, use the original audioformat */
+	if (target->iface == target->sync_iface &&
+	    target->altsetting == target->sync_altsetting)
+		return target;
+
+	subs = find_matching_substream(chip, stream, target->sync_ep,
+				       target->fmt_type);
+	if (!subs)
+		return NULL;
+
+	sync_fmt = NULL;
+	high_score = 0;
+	list_for_each_entry(fp, &subs->fmt_list, list) {
+		score = match_endpoint_audioformats(subs, fp,
+						    params_rate(params),
+						    params_channels(params),
+						    params_format(params));
+		if (score > high_score) {
+			sync_fmt = fp;
+			high_score = score;
+		}
+	}
+
+	return sync_fmt;
+}
+
diff --git a/sound/usb/implicit.h b/sound/usb/implicit.h
new file mode 100644
index 000000000000..ccb415a0ea86
--- /dev/null
+++ b/sound/usb/implicit.h
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef __USBAUDIO_IMPLICIT_H
+#define __USBAUDIO_IMPLICIT_H
+
+int snd_usb_parse_implicit_fb_quirk(struct snd_usb_audio *chip,
+				    struct audioformat *fmt,
+				    struct usb_host_interface *alts);
+const struct audioformat *
+snd_usb_find_implicit_fb_sync_format(struct snd_usb_audio *chip,
+				     const struct audioformat *target,
+				     const struct snd_pcm_hw_params *params,
+				     int stream);
+
+#endif /* __USBAUDIO_IMPLICIT_H */
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 81e987eaf063..12b15ed59eaa 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -3454,48 +3454,6 @@ static int snd_usb_mixer_status_create(struct usb_mixer_interface *mixer)
 	return 0;
 }
 
-static int keep_iface_ctl_get(struct snd_kcontrol *kcontrol,
-			      struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
-
-	ucontrol->value.integer.value[0] = mixer->chip->keep_iface;
-	return 0;
-}
-
-static int keep_iface_ctl_put(struct snd_kcontrol *kcontrol,
-			      struct snd_ctl_elem_value *ucontrol)
-{
-	struct usb_mixer_interface *mixer = snd_kcontrol_chip(kcontrol);
-	bool keep_iface = !!ucontrol->value.integer.value[0];
-
-	if (mixer->chip->keep_iface == keep_iface)
-		return 0;
-	mixer->chip->keep_iface = keep_iface;
-	return 1;
-}
-
-static const struct snd_kcontrol_new keep_iface_ctl = {
-	.iface = SNDRV_CTL_ELEM_IFACE_CARD,
-	.name = "Keep Interface",
-	.info = snd_ctl_boolean_mono_info,
-	.get = keep_iface_ctl_get,
-	.put = keep_iface_ctl_put,
-};
-
-static int create_keep_iface_ctl(struct usb_mixer_interface *mixer)
-{
-	struct snd_kcontrol *kctl = snd_ctl_new1(&keep_iface_ctl, mixer);
-
-	/* need only one control per card */
-	if (snd_ctl_find_id(mixer->chip->card, &kctl->id)) {
-		snd_ctl_free_one(kctl);
-		return 0;
-	}
-
-	return snd_ctl_add(mixer->chip->card, kctl);
-}
-
 int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
 			 int ignore_error)
 {
@@ -3548,10 +3506,6 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
 	if (err < 0)
 		goto _error;
 
-	err = create_keep_iface_ctl(mixer);
-	if (err < 0)
-		goto _error;
-
 	err = snd_usb_mixer_apply_create_quirk(mixer);
 	if (err < 0)
 		goto _error;
diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index c369c81e74c4..a7212f16660e 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -561,7 +561,8 @@ static const struct usbmix_ctl_map usbmix_ctl_maps[] = {
 	},
 	{	/* ASUS ROG Strix */
 		.id = USB_ID(0x0b05, 0x1917),
-		.map = asus_rog_map,
+		.map = trx40_mobo_map,
+		.connector_map = trx40_mobo_connector_map,
 	},
 	{	/* MSI TRX40 Creator */
 		.id = USB_ID(0x0db0, 0x0d64),
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index b401ee894e1b..56079901769f 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -17,13 +17,13 @@
 #include "usbaudio.h"
 #include "card.h"
 #include "quirks.h"
-#include "debug.h"
 #include "endpoint.h"
 #include "helper.h"
 #include "pcm.h"
 #include "clock.h"
 #include "power.h"
 #include "media.h"
+#include "implicit.h"
 
 #define SUBSTREAM_FLAG_DATA_EP_STARTED	0
 #define SUBSTREAM_FLAG_SYNC_EP_STARTED	1
@@ -81,30 +81,34 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream
 /*
  * find a matching audio format
  */
-static struct audioformat *find_format(struct snd_usb_substream *subs)
+static const struct audioformat *
+find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
+	    unsigned int rate, unsigned int channels, bool strict_match,
+	    struct snd_usb_substream *subs)
 {
-	struct audioformat *fp;
-	struct audioformat *found = NULL;
+	const struct audioformat *fp;
+	const struct audioformat *found = NULL;
 	int cur_attr = 0, attr;
 
-	list_for_each_entry(fp, &subs->fmt_list, list) {
-		if (!(fp->formats & pcm_format_to_bits(subs->pcm_format)))
-			continue;
-		if (fp->channels != subs->channels)
-			continue;
-		if (subs->cur_rate < fp->rate_min ||
-		    subs->cur_rate > fp->rate_max)
+	list_for_each_entry(fp, fmt_list_head, list) {
+		if (strict_match) {
+			if (!(fp->formats & pcm_format_to_bits(format)))
+				continue;
+			if (fp->channels != channels)
+				continue;
+		}
+		if (rate < fp->rate_min || rate > fp->rate_max)
 			continue;
-		if (! (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
+		if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
 			unsigned int i;
 			for (i = 0; i < fp->nr_rates; i++)
-				if (fp->rate_table[i] == subs->cur_rate)
+				if (fp->rate_table[i] == rate)
 					break;
 			if (i >= fp->nr_rates)
 				continue;
 		}
 		attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
-		if (! found) {
+		if (!found) {
 			found = fp;
 			cur_attr = attr;
 			continue;
@@ -114,7 +118,7 @@ static struct audioformat *find_format(struct snd_usb_substream *subs)
 		 * this is a workaround for the case like
 		 * M-audio audiophile USB.
 		 */
-		if (attr != cur_attr) {
+		if (subs && attr != cur_attr) {
 			if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
 			     subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
 			    (attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
@@ -138,36 +142,30 @@ static struct audioformat *find_format(struct snd_usb_substream *subs)
 	return found;
 }
 
-static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
-			 struct usb_host_interface *alts,
-			 struct audioformat *fmt)
+static const struct audioformat *
+find_substream_format(struct snd_usb_substream *subs,
+		      const struct snd_pcm_hw_params *params)
+{
+	return find_format(&subs->fmt_list, params_format(params),
+			   params_rate(params), params_channels(params),
+			   true, subs);
+}
+
+static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
 {
 	struct usb_device *dev = chip->dev;
-	unsigned int ep;
 	unsigned char data[1];
 	int err;
 
-	if (get_iface_desc(alts)->bNumEndpoints < 1)
-		return -EINVAL;
-	ep = get_endpoint(alts, 0)->bEndpointAddress;
-
 	data[0] = 1;
 	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
 			      USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
 			      UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
 			      data, sizeof(data));
-	if (err < 0) {
-		usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
-			      iface, ep);
-		return err;
-	}
-
-	return 0;
+	return err;
 }
 
-static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
-			 struct usb_host_interface *alts,
-			 struct audioformat *fmt)
+static int init_pitch_v2(struct snd_usb_audio *chip, int ep)
 {
 	struct usb_device *dev = chip->dev;
 	unsigned char data[1];
@@ -178,34 +176,56 @@ static int init_pitch_v2(struct snd_usb_audio *chip, int iface,
 			      USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 			      UAC2_EP_CS_PITCH << 8, 0,
 			      data, sizeof(data));
-	if (err < 0) {
-		usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
-			      iface, fmt->altsetting);
-		return err;
-	}
-
-	return 0;
+	return err;
 }
 
 /*
  * initialize the pitch control and sample rate
  */
-int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
-		       struct usb_host_interface *alts,
-		       struct audioformat *fmt)
+int snd_usb_init_pitch(struct snd_usb_audio *chip,
+		       const struct audioformat *fmt)
 {
+	int err;
+
 	/* if endpoint doesn't have pitch control, bail out */
 	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 		return 0;
 
+	usb_audio_dbg(chip, "enable PITCH for EP 0x%x\n", fmt->endpoint);
+
 	switch (fmt->protocol) {
 	case UAC_VERSION_1:
+		err = init_pitch_v1(chip, fmt->endpoint);
+		break;
+	case UAC_VERSION_2:
+		err = init_pitch_v2(chip, fmt->endpoint);
+		break;
 	default:
-		return init_pitch_v1(chip, iface, alts, fmt);
+		return 0;
+	}
 
-	case UAC_VERSION_2:
-		return init_pitch_v2(chip, iface, alts, fmt);
+	if (err < 0) {
+		usb_audio_err(chip, "failed to enable PITCH for EP 0x%x\n",
+			      fmt->endpoint);
+		return err;
 	}
+
+	return 0;
+}
+
+static bool stop_endpoints(struct snd_usb_substream *subs)
+{
+	bool stopped = 0;
+
+	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
+		snd_usb_endpoint_stop(subs->sync_endpoint);
+		stopped = true;
+	}
+	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
+		snd_usb_endpoint_stop(subs->data_endpoint);
+		stopped = true;
+	}
+	return stopped;
 }
 
 static int start_endpoints(struct snd_usb_substream *subs)
@@ -216,48 +236,27 @@ static int start_endpoints(struct snd_usb_substream *subs)
 		return -EINVAL;
 
 	if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
-		struct snd_usb_endpoint *ep = subs->data_endpoint;
-
-		dev_dbg(&subs->dev->dev, "Starting data EP @%p\n", ep);
-
-		ep->data_subs = subs;
-		err = snd_usb_endpoint_start(ep);
+		err = snd_usb_endpoint_start(subs->data_endpoint);
 		if (err < 0) {
 			clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
-			return err;
+			goto error;
 		}
 	}
 
 	if (subs->sync_endpoint &&
 	    !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
-		struct snd_usb_endpoint *ep = subs->sync_endpoint;
-
-		if (subs->data_endpoint->iface != subs->sync_endpoint->iface ||
-		    subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) {
-			err = usb_set_interface(subs->dev,
-						subs->sync_endpoint->iface,
-						subs->sync_endpoint->altsetting);
-			if (err < 0) {
-				clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
-				dev_err(&subs->dev->dev,
-					   "%d:%d: cannot set interface (%d)\n",
-					   subs->sync_endpoint->iface,
-					   subs->sync_endpoint->altsetting, err);
-				return -EIO;
-			}
-		}
-
-		dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep);
-
-		ep->sync_slave = subs->data_endpoint;
-		err = snd_usb_endpoint_start(ep);
+		err = snd_usb_endpoint_start(subs->sync_endpoint);
 		if (err < 0) {
 			clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
-			return err;
+			goto error;
 		}
 	}
 
 	return 0;
+
+ error:
+	stop_endpoints(subs);
+	return err;
 }
 
 static void sync_pending_stops(struct snd_usb_substream *subs)
@@ -266,15 +265,6 @@ static void sync_pending_stops(struct snd_usb_substream *subs)
 	snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
 }
 
-static void stop_endpoints(struct snd_usb_substream *subs)
-{
-	if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
-		snd_usb_endpoint_stop(subs->sync_endpoint);
-
-	if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
-		snd_usb_endpoint_stop(subs->data_endpoint);
-}
-
 /* PCM sync_stop callback */
 static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 {
@@ -287,187 +277,42 @@ static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
 	return 0;
 }
 
-static int search_roland_implicit_fb(struct usb_device *dev, int ifnum,
-				     unsigned int altsetting,
-				     struct usb_host_interface **alts,
-				     unsigned int *ep)
-{
-	struct usb_interface *iface;
-	struct usb_interface_descriptor *altsd;
-	struct usb_endpoint_descriptor *epd;
-
-	iface = usb_ifnum_to_if(dev, ifnum);
-	if (!iface || iface->num_altsetting < altsetting + 1)
-		return -ENOENT;
-	*alts = &iface->altsetting[altsetting];
-	altsd = get_iface_desc(*alts);
-	if (altsd->bAlternateSetting != altsetting ||
-	    altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
-	    (altsd->bInterfaceSubClass != 2 &&
-	     altsd->bInterfaceProtocol != 2   ) ||
-	    altsd->bNumEndpoints < 1)
-		return -ENOENT;
-	epd = get_endpoint(*alts, 0);
-	if (!usb_endpoint_is_isoc_in(epd) ||
-	    (epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
-					USB_ENDPOINT_USAGE_IMPLICIT_FB)
-		return -ENOENT;
-	*ep = epd->bEndpointAddress;
-	return 0;
-}
-
-/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
- * applies. Returns 1 if a quirk was found.
- */
-static int set_sync_ep_implicit_fb_quirk(struct snd_usb_substream *subs,
-					 struct usb_device *dev,
-					 struct usb_interface_descriptor *altsd,
-					 unsigned int attr)
+/* Set up sync endpoint */
+int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
+				    struct audioformat *fmt)
 {
+	struct usb_device *dev = chip->dev;
 	struct usb_host_interface *alts;
-	struct usb_interface *iface;
-	unsigned int ep;
-	unsigned int ifnum;
-
-	/* Implicit feedback sync EPs consumers are always playback EPs */
-	if (subs->direction != SNDRV_PCM_STREAM_PLAYBACK)
-		return 0;
-
-	switch (subs->stream->chip->usb_id) {
-	case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
-	case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
-		ep = 0x81;
-		ifnum = 3;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
-	case USB_ID(0x0763, 0x2081):
-		ep = 0x81;
-		ifnum = 2;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
-		ep = 0x86;
-		ifnum = 2;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
-		ep = 0x81;
-		ifnum = 2;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
-	case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
-		ep = 0x81;
-		ifnum = 1;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
-		/* MicroBook IIc */
-		if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
-			return 0;
+	struct usb_interface_descriptor *altsd;
+	unsigned int ep, attr, sync_attr;
+	bool is_playback;
+	int err;
 
-		/* MicroBook II */
-		ep = 0x84;
-		ifnum = 0;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
-	case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
-	case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
-	case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
-	case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
-		ep = 0x81;
-		ifnum = 2;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
-	case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
-		ep = 0x82;
-		ifnum = 0;
-		goto add_sync_ep_from_ifnum;
-	case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
-		/* BOSS Katana amplifiers do not need quirks */
+	alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
+	if (!alts)
 		return 0;
-	}
-
-	if (attr == USB_ENDPOINT_SYNC_ASYNC &&
-	    altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
-	    altsd->bInterfaceProtocol == 2 &&
-	    altsd->bNumEndpoints == 1 &&
-	    USB_ID_VENDOR(subs->stream->chip->usb_id) == 0x0582 /* Roland */ &&
-	    search_roland_implicit_fb(dev, altsd->bInterfaceNumber + 1,
-				      altsd->bAlternateSetting,
-				      &alts, &ep) >= 0) {
-		goto add_sync_ep;
-	}
-
-	/* No quirk */
-	return 0;
-
-add_sync_ep_from_ifnum:
-	iface = usb_ifnum_to_if(dev, ifnum);
-
-	if (!iface || iface->num_altsetting < 2)
-		return -EINVAL;
-
-	alts = &iface->altsetting[1];
-
-add_sync_ep:
-	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
-						   alts, ep, !subs->direction,
-						   SND_USB_ENDPOINT_TYPE_DATA);
-	if (!subs->sync_endpoint)
-		return -EINVAL;
-
-	subs->sync_endpoint->is_implicit_feedback = 1;
-
-	subs->data_endpoint->sync_master = subs->sync_endpoint;
-
-	return 1;
-}
+	altsd = get_iface_desc(alts);
 
-static int set_sync_endpoint(struct snd_usb_substream *subs,
-			     struct audioformat *fmt,
-			     struct usb_device *dev,
-			     struct usb_host_interface *alts,
-			     struct usb_interface_descriptor *altsd)
-{
-	int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
-	unsigned int ep, attr;
-	bool implicit_fb;
-	int err;
+	err = snd_usb_parse_implicit_fb_quirk(chip, fmt, alts);
+	if (err > 0)
+		return 0; /* matched */
 
-	/* we need a sync pipe in async OUT or adaptive IN mode */
-	/* check the number of EP, since some devices have broken
-	 * descriptors which fool us.  if it has only one EP,
-	 * assume it as adaptive-out or sync-in.
+	/*
+	 * Generic sync EP handling
 	 */
-	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
-
-	if ((is_playback && (attr != USB_ENDPOINT_SYNC_ASYNC)) ||
-		(!is_playback && (attr != USB_ENDPOINT_SYNC_ADAPTIVE))) {
-
-		/*
-		 * In these modes the notion of sync_endpoint is irrelevant.
-		 * Reset pointers to avoid using stale data from previously
-		 * used settings, e.g. when configuration and endpoints were
-		 * changed
-		 */
-
-		subs->sync_endpoint = NULL;
-		subs->data_endpoint->sync_master = NULL;
-	}
-
-	err = set_sync_ep_implicit_fb_quirk(subs, dev, altsd, attr);
-	if (err < 0)
-		return err;
-
-	/* endpoint set by quirk */
-	if (err > 0)
-		return 0;
 
 	if (altsd->bNumEndpoints < 2)
 		return 0;
 
+	is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
+	attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 	if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
 			     attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
 	    (!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
 		return 0;
 
+	sync_attr = get_endpoint(alts, 1)->bmAttributes;
+
 	/*
 	 * In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
 	 * if we don't find a sync endpoint, as on M-Audio Transit. In case of
@@ -478,7 +323,7 @@ static int set_sync_endpoint(struct snd_usb_substream *subs,
 	/* ... and check descriptor size before accessing bSynchAddress
 	   because there is a version of the SB Audigy 2 NX firmware lacking
 	   the audio fields in the endpoint descriptors */
-	if ((get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
+	if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
 	    (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
 	     get_endpoint(alts, 1)->bSynchAddress != 0)) {
 		dev_err(&dev->dev,
@@ -505,257 +350,20 @@ static int set_sync_endpoint(struct snd_usb_substream *subs,
 		return -EINVAL;
 	}
 
-	implicit_fb = (get_endpoint(alts, 1)->bmAttributes & USB_ENDPOINT_USAGE_MASK)
-			== USB_ENDPOINT_USAGE_IMPLICIT_FB;
+	fmt->sync_ep = ep;
+	fmt->sync_iface = altsd->bInterfaceNumber;
+	fmt->sync_altsetting = altsd->bAlternateSetting;
+	fmt->sync_ep_idx = 1;
+	if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
+		fmt->implicit_fb = 1;
 
-	subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
-						   alts, ep, !subs->direction,
-						   implicit_fb ?
-							SND_USB_ENDPOINT_TYPE_DATA :
-							SND_USB_ENDPOINT_TYPE_SYNC);
-
-	if (!subs->sync_endpoint) {
-		if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
-			return 0;
-		return -EINVAL;
-	}
-
-	subs->sync_endpoint->is_implicit_feedback = implicit_fb;
-
-	subs->data_endpoint->sync_master = subs->sync_endpoint;
+	dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
+		fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
+		fmt->sync_altsetting, fmt->implicit_fb);
 
 	return 0;
 }
 
-/*
- * find a matching format and set up the interface
- */
-static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
-{
-	struct usb_device *dev = subs->dev;
-	struct usb_host_interface *alts;
-	struct usb_interface_descriptor *altsd;
-	struct usb_interface *iface;
-	int err;
-
-	iface = usb_ifnum_to_if(dev, fmt->iface);
-	if (WARN_ON(!iface))
-		return -EINVAL;
-	alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
-	if (WARN_ON(!alts))
-		return -EINVAL;
-	altsd = get_iface_desc(alts);
-
-	if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
-		return 0;
-
-	/* close the old interface */
-	if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
-		if (!subs->stream->chip->keep_iface) {
-			err = usb_set_interface(subs->dev, subs->interface, 0);
-			if (err < 0) {
-				dev_err(&dev->dev,
-					"%d:%d: return to setting 0 failed (%d)\n",
-					fmt->iface, fmt->altsetting, err);
-				return -EIO;
-			}
-		}
-		subs->interface = -1;
-		subs->altset_idx = 0;
-	}
-
-	if (subs->need_setup_fmt)
-		subs->need_setup_fmt = false;
-
-	/* set interface */
-	if (iface->cur_altsetting != alts) {
-		err = snd_usb_select_mode_quirk(subs, fmt);
-		if (err < 0)
-			return -EIO;
-
-		err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
-		if (err < 0) {
-			dev_err(&dev->dev,
-				"%d:%d: usb_set_interface failed (%d)\n",
-				fmt->iface, fmt->altsetting, err);
-			return -EIO;
-		}
-		dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
-			fmt->iface, fmt->altsetting);
-		snd_usb_set_interface_quirk(dev);
-	}
-
-	subs->interface = fmt->iface;
-	subs->altset_idx = fmt->altset_idx;
-	subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
-						   alts, fmt->endpoint, subs->direction,
-						   SND_USB_ENDPOINT_TYPE_DATA);
-
-	if (!subs->data_endpoint)
-		return -EINVAL;
-
-	err = set_sync_endpoint(subs, fmt, dev, alts, altsd);
-	if (err < 0)
-		return err;
-
-	err = snd_usb_init_pitch(subs->stream->chip, fmt->iface, alts, fmt);
-	if (err < 0)
-		return err;
-
-	subs->cur_audiofmt = fmt;
-
-	snd_usb_set_format_quirk(subs, fmt);
-
-	return 0;
-}
-
-/*
- * Return the score of matching two audioformats.
- * Veto the audioformat if:
- * - It has no channels for some reason.
- * - Requested PCM format is not supported.
- * - Requested sample rate is not supported.
- */
-static int match_endpoint_audioformats(struct snd_usb_substream *subs,
-				       struct audioformat *fp,
-				       struct audioformat *match, int rate,
-				       snd_pcm_format_t pcm_format)
-{
-	int i;
-	int score = 0;
-
-	if (fp->channels < 1) {
-		dev_dbg(&subs->dev->dev,
-			"%s: (fmt @%p) no channels\n", __func__, fp);
-		return 0;
-	}
-
-	if (!(fp->formats & pcm_format_to_bits(pcm_format))) {
-		dev_dbg(&subs->dev->dev,
-			"%s: (fmt @%p) no match for format %d\n", __func__,
-			fp, pcm_format);
-		return 0;
-	}
-
-	for (i = 0; i < fp->nr_rates; i++) {
-		if (fp->rate_table[i] == rate) {
-			score++;
-			break;
-		}
-	}
-	if (!score) {
-		dev_dbg(&subs->dev->dev,
-			"%s: (fmt @%p) no match for rate %d\n", __func__,
-			fp, rate);
-		return 0;
-	}
-
-	if (fp->channels == match->channels)
-		score++;
-
-	dev_dbg(&subs->dev->dev,
-		"%s: (fmt @%p) score %d\n", __func__, fp, score);
-
-	return score;
-}
-
-/*
- * Configure the sync ep using the rate and pcm format of the data ep.
- */
-static int configure_sync_endpoint(struct snd_usb_substream *subs)
-{
-	int ret;
-	struct audioformat *fp;
-	struct audioformat *sync_fp = NULL;
-	int cur_score = 0;
-	int sync_period_bytes = subs->period_bytes;
-	struct snd_usb_substream *sync_subs =
-		&subs->stream->substream[subs->direction ^ 1];
-
-	if (subs->sync_endpoint->type != SND_USB_ENDPOINT_TYPE_DATA ||
-	    !subs->stream)
-		return snd_usb_endpoint_set_params(subs->sync_endpoint,
-						   subs->pcm_format,
-						   subs->channels,
-						   subs->period_bytes,
-						   0, 0,
-						   subs->cur_rate,
-						   subs->cur_audiofmt,
-						   NULL);
-
-	/* Try to find the best matching audioformat. */
-	list_for_each_entry(fp, &sync_subs->fmt_list, list) {
-		int score = match_endpoint_audioformats(subs,
-							fp, subs->cur_audiofmt,
-			subs->cur_rate, subs->pcm_format);
-
-		if (score > cur_score) {
-			sync_fp = fp;
-			cur_score = score;
-		}
-	}
-
-	if (unlikely(sync_fp == NULL)) {
-		dev_err(&subs->dev->dev,
-			"%s: no valid audioformat for sync ep %x found\n",
-			__func__, sync_subs->ep_num);
-		return -EINVAL;
-	}
-
-	/*
-	 * Recalculate the period bytes if channel number differ between
-	 * data and sync ep audioformat.
-	 */
-	if (sync_fp->channels != subs->channels) {
-		sync_period_bytes = (subs->period_bytes / subs->channels) *
-			sync_fp->channels;
-		dev_dbg(&subs->dev->dev,
-			"%s: adjusted sync ep period bytes (%d -> %d)\n",
-			__func__, subs->period_bytes, sync_period_bytes);
-	}
-
-	ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
-					  subs->pcm_format,
-					  sync_fp->channels,
-					  sync_period_bytes,
-					  0, 0,
-					  subs->cur_rate,
-					  sync_fp,
-					  NULL);
-
-	return ret;
-}
-
-/*
- * configure endpoint params
- *
- * called  during initial setup and upon resume
- */
-static int configure_endpoint(struct snd_usb_substream *subs)
-{
-	int ret;
-
-	/* format changed */
-	stop_endpoints(subs);
-	sync_pending_stops(subs);
-	ret = snd_usb_endpoint_set_params(subs->data_endpoint,
-					  subs->pcm_format,
-					  subs->channels,
-					  subs->period_bytes,
-					  subs->period_frames,
-					  subs->buffer_periods,
-					  subs->cur_rate,
-					  subs->cur_audiofmt,
-					  subs->sync_endpoint);
-	if (ret < 0)
-		return ret;
-
-	if (subs->sync_endpoint)
-		ret = configure_sync_endpoint(subs);
-
-	return ret;
-}
-
 static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
 {
 	int ret;
@@ -804,6 +412,45 @@ int snd_usb_pcm_resume(struct snd_usb_stream *as)
 	return 0;
 }
 
+static void close_endpoints(struct snd_usb_audio *chip,
+			    struct snd_usb_substream *subs)
+{
+	if (subs->data_endpoint) {
+		snd_usb_endpoint_set_sync(chip, subs->data_endpoint, NULL);
+		snd_usb_endpoint_close(chip, subs->data_endpoint);
+		subs->data_endpoint = NULL;
+	}
+
+	if (subs->sync_endpoint) {
+		snd_usb_endpoint_close(chip, subs->sync_endpoint);
+		subs->sync_endpoint = NULL;
+	}
+}
+
+static int configure_endpoints(struct snd_usb_audio *chip,
+			       struct snd_usb_substream *subs)
+{
+	int err;
+
+	if (subs->data_endpoint->need_setup) {
+		/* stop any running stream beforehand */
+		if (stop_endpoints(subs))
+			sync_pending_stops(subs);
+		err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
+		if (err < 0)
+			return err;
+		snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
+	}
+
+	if (subs->sync_endpoint) {
+		err = snd_usb_endpoint_configure(chip, subs->sync_endpoint);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
 /*
  * hw_params callback
  *
@@ -818,30 +465,44 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 			     struct snd_pcm_hw_params *hw_params)
 {
 	struct snd_usb_substream *subs = substream->runtime->private_data;
-	struct audioformat *fmt;
+	struct snd_usb_audio *chip = subs->stream->chip;
+	const struct audioformat *fmt;
+	const struct audioformat *sync_fmt;
 	int ret;
 
 	ret = snd_media_start_pipeline(subs);
 	if (ret)
 		return ret;
 
-	subs->pcm_format = params_format(hw_params);
-	subs->period_bytes = params_period_bytes(hw_params);
-	subs->period_frames = params_period_size(hw_params);
-	subs->buffer_periods = params_periods(hw_params);
-	subs->channels = params_channels(hw_params);
-	subs->cur_rate = params_rate(hw_params);
-
-	fmt = find_format(subs);
+	fmt = find_substream_format(subs, hw_params);
 	if (!fmt) {
-		dev_dbg(&subs->dev->dev,
-			"cannot set format: format = %#x, rate = %d, channels = %d\n",
-			   subs->pcm_format, subs->cur_rate, subs->channels);
+		usb_audio_dbg(chip,
+			      "cannot find format: format=%s, rate=%d, channels=%d\n",
+			      snd_pcm_format_name(params_format(hw_params)),
+			      params_rate(hw_params), params_channels(hw_params));
 		ret = -EINVAL;
 		goto stop_pipeline;
 	}
 
-	ret = snd_usb_lock_shutdown(subs->stream->chip);
+	if (fmt->implicit_fb) {
+		sync_fmt = snd_usb_find_implicit_fb_sync_format(chip, fmt,
+								hw_params,
+								!substream->stream);
+		if (!sync_fmt) {
+			usb_audio_dbg(chip,
+				      "cannot find sync format: ep=0x%x, iface=%d:%d, format=%s, rate=%d, channels=%d\n",
+				      fmt->sync_ep, fmt->sync_iface,
+				      fmt->sync_altsetting,
+				      snd_pcm_format_name(params_format(hw_params)),
+				      params_rate(hw_params), params_channels(hw_params));
+			ret = -EINVAL;
+			goto stop_pipeline;
+		}
+	} else {
+		sync_fmt = fmt;
+	}
+
+	ret = snd_usb_lock_shutdown(chip);
 	if (ret < 0)
 		goto stop_pipeline;
 
@@ -849,22 +510,47 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 	if (ret < 0)
 		goto unlock;
 
-	ret = set_format(subs, fmt);
-	if (ret < 0)
+	if (subs->data_endpoint) {
+		if (snd_usb_endpoint_compatible(chip, subs->data_endpoint,
+						fmt, hw_params))
+			goto unlock;
+		close_endpoints(chip, subs);
+	}
+
+	subs->data_endpoint = snd_usb_endpoint_open(chip, fmt, hw_params, false);
+	if (!subs->data_endpoint) {
+		ret = -EINVAL;
 		goto unlock;
+	}
 
-	subs->interface = fmt->iface;
-	subs->altset_idx = fmt->altset_idx;
-	subs->need_setup_ep = true;
+	if (fmt->sync_ep) {
+		subs->sync_endpoint = snd_usb_endpoint_open(chip, sync_fmt,
+							    hw_params,
+							    fmt == sync_fmt);
+		if (!subs->sync_endpoint) {
+			ret = -EINVAL;
+			goto unlock;
+		}
+
+		snd_usb_endpoint_set_sync(chip, subs->data_endpoint,
+					  subs->sync_endpoint);
+	}
+
+	mutex_lock(&chip->mutex);
+	subs->cur_audiofmt = fmt;
+	mutex_unlock(&chip->mutex);
+
+	ret = configure_endpoints(chip, subs);
 
  unlock:
-	snd_usb_unlock_shutdown(subs->stream->chip);
 	if (ret < 0)
-		goto stop_pipeline;
-	return ret;
+		close_endpoints(chip, subs);
 
+	snd_usb_unlock_shutdown(chip);
  stop_pipeline:
-	snd_media_stop_pipeline(subs);
+	if (ret < 0)
+		snd_media_stop_pipeline(subs);
+
 	return ret;
 }
 
@@ -876,17 +562,17 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
 static int snd_usb_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_usb_substream *subs = substream->runtime->private_data;
+	struct snd_usb_audio *chip = subs->stream->chip;
 
 	snd_media_stop_pipeline(subs);
+	mutex_lock(&chip->mutex);
 	subs->cur_audiofmt = NULL;
-	subs->cur_rate = 0;
-	subs->period_bytes = 0;
-	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
-		stop_endpoints(subs);
-		sync_pending_stops(subs);
-		snd_usb_endpoint_deactivate(subs->sync_endpoint);
-		snd_usb_endpoint_deactivate(subs->data_endpoint);
-		snd_usb_unlock_shutdown(subs->stream->chip);
+	mutex_unlock(&chip->mutex);
+	if (!snd_usb_lock_shutdown(chip)) {
+		if (stop_endpoints(subs))
+			sync_pending_stops(subs);
+		close_endpoints(chip, subs);
+		snd_usb_unlock_shutdown(chip);
 	}
 
 	return 0;
@@ -901,16 +587,10 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_usb_substream *subs = runtime->private_data;
-	struct usb_host_interface *alts;
-	struct usb_interface *iface;
+	struct snd_usb_audio *chip = subs->stream->chip;
 	int ret;
 
-	if (! subs->cur_audiofmt) {
-		dev_err(&subs->dev->dev, "no format is specified!\n");
-		return -ENXIO;
-	}
-
-	ret = snd_usb_lock_shutdown(subs->stream->chip);
+	ret = snd_usb_lock_shutdown(chip);
 	if (ret < 0)
 		return ret;
 	if (snd_BUG_ON(!subs->data_endpoint)) {
@@ -918,38 +598,10 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 		goto unlock;
 	}
 
-	ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
-	if (ret < 0)
-		goto unlock;
-
-	ret = set_format(subs, subs->cur_audiofmt);
+	ret = configure_endpoints(chip, subs);
 	if (ret < 0)
 		goto unlock;
 
-	if (subs->need_setup_ep) {
-
-		iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
-		alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
-		ret = snd_usb_init_sample_rate(subs->stream->chip,
-					       subs->cur_audiofmt->iface,
-					       alts,
-					       subs->cur_audiofmt,
-					       subs->cur_rate);
-		if (ret < 0)
-			goto unlock;
-
-		ret = configure_endpoint(subs);
-		if (ret < 0)
-			goto unlock;
-		subs->need_setup_ep = false;
-	}
-
-	/* some unit conversions in runtime */
-	subs->data_endpoint->maxframesize =
-		bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
-	subs->data_endpoint->curframesize =
-		bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
-
 	/* reset the pointer */
 	subs->hwptr_done = 0;
 	subs->transfer_done = 0;
@@ -963,10 +615,20 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 		ret = start_endpoints(subs);
 
  unlock:
-	snd_usb_unlock_shutdown(subs->stream->chip);
+	snd_usb_unlock_shutdown(chip);
 	return ret;
 }
 
+/*
+ * h/w constraints
+ */
+
+#ifdef HW_CONST_DEBUG
+#define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
+#else
+#define hwc_debug(fmt, args...) do { } while(0)
+#endif
+
 static const struct snd_pcm_hardware snd_usb_hardware =
 {
 	.info =			SNDRV_PCM_INFO_MMAP |
@@ -975,6 +637,8 @@ static const struct snd_pcm_hardware snd_usb_hardware =
 				SNDRV_PCM_INFO_INTERLEAVED |
 				SNDRV_PCM_INFO_BLOCK_TRANSFER |
 				SNDRV_PCM_INFO_PAUSE,
+	.channels_min =		1,
+	.channels_max =		256,
 	.buffer_bytes_max =	1024 * 1024,
 	.period_bytes_min =	64,
 	.period_bytes_max =	512 * 1024,
@@ -984,7 +648,7 @@ static const struct snd_pcm_hardware snd_usb_hardware =
 
 static int hw_check_valid_format(struct snd_usb_substream *subs,
 				 struct snd_pcm_hw_params *params,
-				 struct audioformat *fp)
+				 const struct audioformat *fp)
 {
 	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
 	struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
@@ -1027,33 +691,12 @@ static int hw_check_valid_format(struct snd_usb_substream *subs,
 	return 1;
 }
 
-static int hw_rule_rate(struct snd_pcm_hw_params *params,
-			struct snd_pcm_hw_rule *rule)
+static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
+				  unsigned int rmax)
 {
-	struct snd_usb_substream *subs = rule->private;
-	struct audioformat *fp;
-	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
-	unsigned int rmin, rmax;
 	int changed;
 
-	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
-	changed = 0;
-	rmin = rmax = 0;
-	list_for_each_entry(fp, &subs->fmt_list, list) {
-		if (!hw_check_valid_format(subs, params, fp))
-			continue;
-		if (changed++) {
-			if (rmin > fp->rate_min)
-				rmin = fp->rate_min;
-			if (rmax < fp->rate_max)
-				rmax = fp->rate_max;
-		} else {
-			rmin = fp->rate_min;
-			rmax = fp->rate_max;
-		}
-	}
-
-	if (!changed) {
+	if (rmin > rmax) {
 		hwc_debug("  --> get empty\n");
 		it->empty = 1;
 		return -EINVAL;
@@ -1078,63 +721,65 @@ static int hw_rule_rate(struct snd_pcm_hw_params *params,
 	return changed;
 }
 
+static int hw_rule_rate(struct snd_pcm_hw_params *params,
+			struct snd_pcm_hw_rule *rule)
+{
+	struct snd_usb_substream *subs = rule->private;
+	const struct audioformat *fp;
+	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+	unsigned int rmin, rmax, r;
+	int i;
+
+	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
+	rmin = UINT_MAX;
+	rmax = 0;
+	list_for_each_entry(fp, &subs->fmt_list, list) {
+		if (!hw_check_valid_format(subs, params, fp))
+			continue;
+		if (fp->rate_table && fp->nr_rates) {
+			for (i = 0; i < fp->nr_rates; i++) {
+				r = fp->rate_table[i];
+				if (!snd_interval_test(it, r))
+					continue;
+				rmin = min(rmin, r);
+				rmax = max(rmax, r);
+			}
+		} else {
+			rmin = min(rmin, fp->rate_min);
+			rmax = max(rmax, fp->rate_max);
+		}
+	}
+
+	return apply_hw_params_minmax(it, rmin, rmax);
+}
+
 
 static int hw_rule_channels(struct snd_pcm_hw_params *params,
 			    struct snd_pcm_hw_rule *rule)
 {
 	struct snd_usb_substream *subs = rule->private;
-	struct audioformat *fp;
+	const struct audioformat *fp;
 	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
 	unsigned int rmin, rmax;
-	int changed;
 
 	hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
-	changed = 0;
-	rmin = rmax = 0;
+	rmin = UINT_MAX;
+	rmax = 0;
 	list_for_each_entry(fp, &subs->fmt_list, list) {
 		if (!hw_check_valid_format(subs, params, fp))
 			continue;
-		if (changed++) {
-			if (rmin > fp->channels)
-				rmin = fp->channels;
-			if (rmax < fp->channels)
-				rmax = fp->channels;
-		} else {
-			rmin = fp->channels;
-			rmax = fp->channels;
-		}
-	}
-
-	if (!changed) {
-		hwc_debug("  --> get empty\n");
-		it->empty = 1;
-		return -EINVAL;
+		rmin = min(rmin, fp->channels);
+		rmax = max(rmax, fp->channels);
 	}
 
-	changed = 0;
-	if (it->min < rmin) {
-		it->min = rmin;
-		it->openmin = 0;
-		changed = 1;
-	}
-	if (it->max > rmax) {
-		it->max = rmax;
-		it->openmax = 0;
-		changed = 1;
-	}
-	if (snd_interval_checkempty(it)) {
-		it->empty = 1;
-		return -EINVAL;
-	}
-	hwc_debug("  --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
-	return changed;
+	return apply_hw_params_minmax(it, rmin, rmax);
 }
 
 static int hw_rule_format(struct snd_pcm_hw_params *params,
 			  struct snd_pcm_hw_rule *rule)
 {
 	struct snd_usb_substream *subs = rule->private;
-	struct audioformat *fp;
+	const struct audioformat *fp;
 	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
 	u64 fbits;
 	u32 oldbits[2];
@@ -1165,11 +810,10 @@ static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 			       struct snd_pcm_hw_rule *rule)
 {
 	struct snd_usb_substream *subs = rule->private;
-	struct audioformat *fp;
+	const struct audioformat *fp;
 	struct snd_interval *it;
 	unsigned char min_datainterval;
 	unsigned int pmin;
-	int changed;
 
 	it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
 	hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
@@ -1185,64 +829,69 @@ static int hw_rule_period_time(struct snd_pcm_hw_params *params,
 		return -EINVAL;
 	}
 	pmin = 125 * (1 << min_datainterval);
-	changed = 0;
-	if (it->min < pmin) {
-		it->min = pmin;
-		it->openmin = 0;
-		changed = 1;
-	}
-	if (snd_interval_checkempty(it)) {
-		it->empty = 1;
-		return -EINVAL;
-	}
-	hwc_debug("  --> (%u,%u) (changed = %d)\n", it->min, it->max, changed);
-	return changed;
+
+	return apply_hw_params_minmax(it, pmin, UINT_MAX);
 }
 
-/*
- *  If the device supports unusual bit rates, does the request meet these?
- */
-static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
-				  struct snd_usb_substream *subs)
+/* apply PCM hw constraints from the concurrent sync EP */
+static int apply_hw_constraint_from_sync(struct snd_pcm_runtime *runtime,
+					 struct snd_usb_substream *subs)
 {
-	struct audioformat *fp;
-	int *rate_list;
-	int count = 0, needs_knot = 0;
+	struct snd_usb_audio *chip = subs->stream->chip;
+	struct snd_usb_endpoint *ep;
+	const struct audioformat *fp;
 	int err;
 
-	kfree(subs->rate_list.list);
-	subs->rate_list.list = NULL;
-
 	list_for_each_entry(fp, &subs->fmt_list, list) {
-		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
-			return 0;
-		count += fp->nr_rates;
-		if (fp->rates & SNDRV_PCM_RATE_KNOT)
-			needs_knot = 1;
+		ep = snd_usb_get_endpoint(chip, fp->endpoint);
+		if (ep && ep->cur_rate)
+			goto found;
+		if (!fp->implicit_fb)
+			continue;
+		/* for the implicit fb, check the sync ep as well */
+		ep = snd_usb_get_endpoint(chip, fp->sync_ep);
+		if (ep && ep->cur_rate)
+			goto found;
 	}
-	if (!needs_knot)
-		return 0;
+	return 0;
 
-	subs->rate_list.list = rate_list =
-		kmalloc_array(count, sizeof(int), GFP_KERNEL);
-	if (!subs->rate_list.list)
-		return -ENOMEM;
-	subs->rate_list.count = count;
-	subs->rate_list.mask = 0;
-	count = 0;
-	list_for_each_entry(fp, &subs->fmt_list, list) {
-		int i;
-		for (i = 0; i < fp->nr_rates; i++)
-			rate_list[count++] = fp->rate_table[i];
+ found:
+	if (!find_format(&subs->fmt_list, ep->cur_format, ep->cur_rate,
+			 ep->cur_channels, false, NULL)) {
+		usb_audio_dbg(chip, "EP 0x%x being used, but not applicable\n",
+			      ep->ep_num);
+		return 0;
 	}
-	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
-					 &subs->rate_list);
+
+	usb_audio_dbg(chip, "EP 0x%x being used, using fixed params:\n",
+		      ep->ep_num);
+	usb_audio_dbg(chip, "rate=%d, period_size=%d, periods=%d\n",
+		      ep->cur_rate, ep->cur_period_frames,
+		      ep->cur_buffer_periods);
+
+	runtime->hw.formats = subs->formats;
+	runtime->hw.rate_min = runtime->hw.rate_max = ep->cur_rate;
+	runtime->hw.rates = SNDRV_PCM_RATE_KNOT;
+	runtime->hw.periods_min = runtime->hw.periods_max =
+		ep->cur_buffer_periods;
+
+	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+				  hw_rule_channels, subs,
+				  SNDRV_PCM_HW_PARAM_FORMAT,
+				  SNDRV_PCM_HW_PARAM_RATE,
+				  -1);
 	if (err < 0)
 		return err;
 
-	return 0;
-}
+	err = snd_pcm_hw_constraint_minmax(runtime,
+					   SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+					   ep->cur_period_frames,
+					   ep->cur_period_frames);
+	if (err < 0)
+		return err;
 
+	return 1; /* notify the finding */
+}
 
 /*
  * set up the runtime hardware information.
@@ -1250,11 +899,20 @@ static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 
 static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
 {
-	struct audioformat *fp;
+	struct snd_usb_audio *chip = subs->stream->chip;
+	const struct audioformat *fp;
 	unsigned int pt, ptmin;
-	int param_period_time_if_needed;
+	int param_period_time_if_needed = -1;
 	int err;
 
+	mutex_lock(&chip->mutex);
+	err = apply_hw_constraint_from_sync(runtime, subs);
+	mutex_unlock(&chip->mutex);
+	if (err < 0)
+		return err;
+	if (err > 0) /* found the matching? */
+		goto add_extra_rules;
+
 	runtime->hw.formats = subs->formats;
 
 	runtime->hw.rate_min = 0x7fffffff;
@@ -1305,6 +963,8 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
 				  -1);
 	if (err < 0)
 		return err;
+
+add_extra_rules:
 	err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 				  hw_rule_channels, subs,
 				  SNDRV_PCM_HW_PARAM_FORMAT,
@@ -1332,11 +992,8 @@ static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substre
 		if (err < 0)
 			return err;
 	}
-	err = snd_usb_pcm_check_knot(runtime, subs);
-	if (err < 0)
-		return err;
 
-	return snd_usb_autoresume(subs->stream->chip);
+	return 0;
 }
 
 static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
@@ -1347,8 +1004,6 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
 	struct snd_usb_substream *subs = &as->substream[direction];
 	int ret;
 
-	subs->interface = -1;
-	subs->altset_idx = 0;
 	runtime->hw = snd_usb_hardware;
 	runtime->private_data = subs;
 	subs->pcm_substream = substream;
@@ -1360,11 +1015,14 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
 	subs->dsd_dop.marker = 1;
 
 	ret = setup_hw_info(runtime, subs);
-	if (ret == 0) {
-		ret = snd_media_stream_init(subs, as->pcm, direction);
-		if (ret)
-			snd_usb_autosuspend(subs->stream->chip);
-	}
+	if (ret < 0)
+		return ret;
+	ret = snd_usb_autoresume(subs->stream->chip);
+	if (ret < 0)
+		return ret;
+	ret = snd_media_stream_init(subs, as->pcm, direction);
+	if (ret < 0)
+		snd_usb_autosuspend(subs->stream->chip);
 	return ret;
 }
 
@@ -1377,11 +1035,7 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
 
 	snd_media_stop_pipeline(subs);
 
-	if (!as->chip->keep_iface &&
-	    subs->interface >= 0 &&
-	    !snd_usb_lock_shutdown(subs->stream->chip)) {
-		usb_set_interface(subs->dev, subs->interface, 0);
-		subs->interface = -1;
+	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
 		ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
 		snd_usb_unlock_shutdown(subs->stream->chip);
 		if (ret < 0)
@@ -1597,13 +1251,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
 	spin_lock_irqsave(&subs->lock, flags);
 	subs->frame_limit += ep->max_urb_frames;
 	for (i = 0; i < ctx->packets; i++) {
-		if (ctx->packet_size[i])
-			counts = ctx->packet_size[i];
-		else if (ep->sync_master)
-			counts = snd_usb_endpoint_slave_next_packet_size(ep);
-		else
-			counts = snd_usb_endpoint_next_packet_size(ep);
-
+		counts = snd_usb_endpoint_next_packet_size(ep, ctx, i);
 		/* set up descriptor */
 		urb->iso_frame_desc[i].offset = frames * ep->stride;
 		urb->iso_frame_desc[i].length = counts * ep->stride;
@@ -1643,10 +1291,10 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
 	}
 	bytes = frames * ep->stride;
 
-	if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
+	if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
 		     subs->cur_audiofmt->dsd_dop)) {
 		fill_playback_urb_dsd_dop(subs, urb, bytes);
-	} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
+	} else if (unlikely(ep->cur_format == SNDRV_PCM_FORMAT_DSD_U8 &&
 			   subs->cur_audiofmt->dsd_bitrev)) {
 		/* bit-reverse the bytes */
 		u8 *buf = urb->transfer_buffer;
@@ -1754,27 +1402,36 @@ static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substrea
 		subs->trigger_tstamp_pending_update = true;
 		fallthrough;
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
-		subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
-		subs->data_endpoint->retire_data_urb = retire_playback_urb;
+		snd_usb_endpoint_set_callback(subs->data_endpoint,
+					      prepare_playback_urb,
+					      retire_playback_urb,
+					      subs);
 		subs->running = 1;
+		dev_dbg(&subs->dev->dev, "%d:%d Start Playback PCM\n",
+			subs->cur_audiofmt->iface,
+			subs->cur_audiofmt->altsetting);
 		return 0;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_STOP:
 		stop_endpoints(subs);
+		snd_usb_endpoint_set_callback(subs->data_endpoint,
+					      NULL, NULL, NULL);
 		subs->running = 0;
+		dev_dbg(&subs->dev->dev, "%d:%d Stop Playback PCM\n",
+			subs->cur_audiofmt->iface,
+			subs->cur_audiofmt->altsetting);
 		return 0;
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-		subs->data_endpoint->prepare_data_urb = NULL;
 		/* keep retire_data_urb for delay calculation */
-		subs->data_endpoint->retire_data_urb = retire_playback_urb;
+		snd_usb_endpoint_set_callback(subs->data_endpoint,
+					      NULL,
+					      retire_playback_urb,
+					      subs);
 		subs->running = 0;
+		dev_dbg(&subs->dev->dev, "%d:%d Pause Playback PCM\n",
+			subs->cur_audiofmt->iface,
+			subs->cur_audiofmt->altsetting);
 		return 0;
-	case SNDRV_PCM_TRIGGER_SUSPEND:
-		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
-			stop_endpoints(subs);
-			subs->need_setup_fmt = true;
-			return 0;
-		}
-		break;
 	}
 
 	return -EINVAL;
@@ -1791,30 +1448,28 @@ static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream
 		err = start_endpoints(subs);
 		if (err < 0)
 			return err;
-
-		subs->data_endpoint->retire_data_urb = retire_capture_urb;
+		fallthrough;
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		snd_usb_endpoint_set_callback(subs->data_endpoint,
+					      NULL, retire_capture_urb,
+					      subs);
 		subs->running = 1;
+		dev_dbg(&subs->dev->dev, "%d:%d Start Capture PCM\n",
+			subs->cur_audiofmt->iface,
+			subs->cur_audiofmt->altsetting);
 		return 0;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_STOP:
 		stop_endpoints(subs);
-		subs->data_endpoint->retire_data_urb = NULL;
-		subs->running = 0;
-		return 0;
+		fallthrough;
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
-		subs->data_endpoint->retire_data_urb = NULL;
+		snd_usb_endpoint_set_callback(subs->data_endpoint,
+					      NULL, NULL, NULL);
 		subs->running = 0;
+		dev_dbg(&subs->dev->dev, "%d:%d Stop Capture PCM\n",
+			subs->cur_audiofmt->iface,
+			subs->cur_audiofmt->altsetting);
 		return 0;
-	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
-		subs->data_endpoint->retire_data_urb = retire_capture_urb;
-		subs->running = 1;
-		return 0;
-	case SNDRV_PCM_TRIGGER_SUSPEND:
-		if (subs->stream->chip->setup_fmt_after_resume_quirk) {
-			stop_endpoints(subs);
-			subs->need_setup_fmt = true;
-			return 0;
-		}
-		break;
 	}
 
 	return -EINVAL;
diff --git a/sound/usb/pcm.h b/sound/usb/pcm.h
index 9833627c1eca..06c586467d3f 100644
--- a/sound/usb/pcm.h
+++ b/sound/usb/pcm.h
@@ -9,10 +9,11 @@ void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream);
 int snd_usb_pcm_suspend(struct snd_usb_stream *as);
 int snd_usb_pcm_resume(struct snd_usb_stream *as);
 
-int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
-		       struct usb_host_interface *alts,
-		       struct audioformat *fmt);
+int snd_usb_init_pitch(struct snd_usb_audio *chip,
+		       const struct audioformat *fmt);
 void snd_usb_preallocate_buffer(struct snd_usb_substream *subs);
 
+int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
+				    struct audioformat *fmt);
 
 #endif /* __USBAUDIO_PCM_H */
diff --git a/sound/usb/proc.c b/sound/usb/proc.c
index 889c550c9f29..e9bbaea7b2fa 100644
--- a/sound/usb/proc.c
+++ b/sound/usb/proc.c
@@ -108,7 +108,8 @@ static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct s
 					    snd_pcm_format_name(fmt));
 		snd_iprintf(buffer, "\n");
 		snd_iprintf(buffer, "    Channels: %d\n", fp->channels);
-		snd_iprintf(buffer, "    Endpoint: %d %s (%s)\n",
+		snd_iprintf(buffer, "    Endpoint: 0x%02x (%d %s) (%s)\n",
+			    fp->endpoint,
 			    fp->endpoint & USB_ENDPOINT_NUMBER_MASK,
 			    fp->endpoint & USB_DIR_IN ? "IN" : "OUT",
 			    sync_types[(fp->ep_attr & USB_ENDPOINT_SYNCTYPE) >> 2]);
@@ -150,6 +151,19 @@ static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct s
 			snd_iprintf(buffer, "\n");
 		}
 
+		if (fp->sync_ep) {
+			snd_iprintf(buffer, "    Sync Endpoint: 0x%02x (%d %s)\n",
+				    fp->sync_ep,
+				    fp->sync_ep & USB_ENDPOINT_NUMBER_MASK,
+				    fp->sync_ep & USB_DIR_IN ? "IN" : "OUT");
+			snd_iprintf(buffer, "    Sync EP Interface: %d\n",
+				    fp->sync_iface);
+			snd_iprintf(buffer, "    Sync EP Altset: %d\n",
+				    fp->sync_altsetting);
+			snd_iprintf(buffer, "    Implicit Feedback Mode: %s\n",
+				    fp->implicit_fb ? "Yes" : "No");
+		}
+
 		// snd_iprintf(buffer, "    Max Packet Size = %d\n", fp->maxpacksize);
 		// snd_iprintf(buffer, "    EP Attribute = %#x\n", fp->attributes);
 	}
@@ -175,32 +189,39 @@ static void proc_dump_ep_status(struct snd_usb_substream *subs,
 	}
 }
 
-static void proc_dump_substream_status(struct snd_usb_substream *subs, struct snd_info_buffer *buffer)
+static void proc_dump_substream_status(struct snd_usb_audio *chip,
+				       struct snd_usb_substream *subs,
+				       struct snd_info_buffer *buffer)
 {
+	mutex_lock(&chip->mutex);
 	if (subs->running) {
 		snd_iprintf(buffer, "  Status: Running\n");
-		snd_iprintf(buffer, "    Interface = %d\n", subs->interface);
-		snd_iprintf(buffer, "    Altset = %d\n", subs->altset_idx);
+		if (subs->cur_audiofmt) {
+			snd_iprintf(buffer, "    Interface = %d\n", subs->cur_audiofmt->iface);
+			snd_iprintf(buffer, "    Altset = %d\n", subs->cur_audiofmt->altsetting);
+		}
 		proc_dump_ep_status(subs, subs->data_endpoint, subs->sync_endpoint, buffer);
 	} else {
 		snd_iprintf(buffer, "  Status: Stop\n");
 	}
+	mutex_unlock(&chip->mutex);
 }
 
 static void proc_pcm_format_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
 	struct snd_usb_stream *stream = entry->private_data;
+	struct snd_usb_audio *chip = stream->chip;
 
-	snd_iprintf(buffer, "%s : %s\n", stream->chip->card->longname, stream->pcm->name);
+	snd_iprintf(buffer, "%s : %s\n", chip->card->longname, stream->pcm->name);
 
 	if (stream->substream[SNDRV_PCM_STREAM_PLAYBACK].num_formats) {
 		snd_iprintf(buffer, "\nPlayback:\n");
-		proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
+		proc_dump_substream_status(chip, &stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
 		proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_PLAYBACK], buffer);
 	}
 	if (stream->substream[SNDRV_PCM_STREAM_CAPTURE].num_formats) {
 		snd_iprintf(buffer, "\nCapture:\n");
-		proc_dump_substream_status(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
+		proc_dump_substream_status(chip, &stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
 		proc_dump_substream_formats(&stream->substream[SNDRV_PCM_STREAM_CAPTURE], buffer);
 	}
 }
diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index 3c1697f6b60c..85b99c6d3c61 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -3256,14 +3256,6 @@ AU0828_DEVICE(0x2040, 0x7270, "Hauppauge", "HVR-950Q"),
 		}
 	}
 },
-/* Dell WD19 Dock */
-{
-	USB_DEVICE(0x0bda, 0x402e),
-	.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
-		.ifnum = QUIRK_ANY_INTERFACE,
-		.type = QUIRK_SETUP_FMT_AFTER_RESUME
-	}
-},
 /* MOTU Microbook II */
 {
 	USB_DEVICE_VENDOR_SPEC(0x07fd, 0x0004),
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index b4fa80ef730d..63cdf3c8c2bc 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -177,8 +177,8 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
 	if (fp->maxpacksize == 0)
 		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 	usb_set_interface(chip->dev, fp->iface, 0);
-	snd_usb_init_pitch(chip, fp->iface, alts, fp);
-	snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
+	snd_usb_init_pitch(chip, fp);
+	snd_usb_init_sample_rate(chip, fp, fp->rate_max);
 	return 0;
 
  error:
@@ -508,16 +508,6 @@ static int create_standard_mixer_quirk(struct snd_usb_audio *chip,
 	return snd_usb_create_mixer(chip, quirk->ifnum, 0);
 }
 
-
-static int setup_fmt_after_resume_quirk(struct snd_usb_audio *chip,
-				       struct usb_interface *iface,
-				       struct usb_driver *driver,
-				       const struct snd_usb_audio_quirk *quirk)
-{
-	chip->setup_fmt_after_resume_quirk = 1;
-	return 1;	/* Continue with creating streams and mixer */
-}
-
 static int setup_disable_autosuspend(struct snd_usb_audio *chip,
 				       struct usb_interface *iface,
 				       struct usb_driver *driver,
@@ -565,7 +555,6 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
 		[QUIRK_AUDIO_EDIROL_UAXX] = create_uaxx_quirk,
 		[QUIRK_AUDIO_ALIGN_TRANSFER] = create_align_transfer_quirk,
 		[QUIRK_AUDIO_STANDARD_MIXER] = create_standard_mixer_quirk,
-		[QUIRK_SETUP_FMT_AFTER_RESUME] = setup_fmt_after_resume_quirk,
 		[QUIRK_SETUP_DISABLE_AUTOSUSPEND] = setup_disable_autosuspend,
 	};
 
@@ -1121,24 +1110,8 @@ free_buf:
 
 static int snd_usb_motu_m_series_boot_quirk(struct usb_device *dev)
 {
-	int ret;
-
-	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
-			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-			      0x0, 0, NULL, 0, 1000);
-
-	if (ret < 0)
-		return ret;
-
 	msleep(2000);
 
-	ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
-			      1, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-			      0x20, 0, NULL, 0, 1000);
-
-	if (ret < 0)
-		return ret;
-
 	return 0;
 }
 
@@ -1386,7 +1359,8 @@ int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
 /*
  * check if the device uses big-endian samples
  */
-int snd_usb_is_big_endian_format(struct snd_usb_audio *chip, struct audioformat *fp)
+int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
+				 const struct audioformat *fp)
 {
 	/* it depends on altsetting whether the device is big-endian or not */
 	switch (chip->usb_id) {
@@ -1425,7 +1399,7 @@ enum {
 };
 
 static void set_format_emu_quirk(struct snd_usb_substream *subs,
-				 struct audioformat *fmt)
+				 const struct audioformat *fmt)
 {
 	unsigned char emu_samplerate_id = 0;
 
@@ -1434,7 +1408,7 @@ static void set_format_emu_quirk(struct snd_usb_substream *subs,
 	 * by playback substream
 	 */
 	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK) {
-		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].interface != -1)
+		if (subs->stream->substream[SNDRV_PCM_STREAM_CAPTURE].cur_audiofmt)
 			return;
 	}
 
@@ -1469,13 +1443,13 @@ static void set_format_emu_quirk(struct snd_usb_substream *subs,
  */
 static int pioneer_djm_set_format_quirk(struct snd_usb_substream *subs)
 {
-
+	unsigned int cur_rate = subs->data_endpoint->cur_rate;
 	/* Convert sample rate value to little endian */
 	u8 sr[3];
 
-	sr[0] = subs->cur_rate & 0xff;
-	sr[1] = (subs->cur_rate >> 8) & 0xff;
-	sr[2] = (subs->cur_rate >> 16) & 0xff;
+	sr[0] = cur_rate & 0xff;
+	sr[1] = (cur_rate >> 8) & 0xff;
+	sr[2] = (cur_rate >> 16) & 0xff;
 
 	/* Configure device */
 	usb_set_interface(subs->dev, 0, 1);
@@ -1487,7 +1461,7 @@ static int pioneer_djm_set_format_quirk(struct snd_usb_substream *subs)
 }
 
 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
-			      struct audioformat *fmt)
+			      const struct audioformat *fmt)
 {
 	switch (subs->stream->chip->usb_id) {
 	case USB_ID(0x041e, 0x3f02): /* E-Mu 0202 USB */
@@ -1553,13 +1527,13 @@ static bool is_itf_usb_dsd_dac(unsigned int id)
 	return false;
 }
 
-int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
-			      struct audioformat *fmt)
+int snd_usb_select_mode_quirk(struct snd_usb_audio *chip,
+			      const struct audioformat *fmt)
 {
-	struct usb_device *dev = subs->dev;
+	struct usb_device *dev = chip->dev;
 	int err;
 
-	if (is_itf_usb_dsd_dac(subs->stream->chip->usb_id)) {
+	if (is_itf_usb_dsd_dac(chip->usb_id)) {
 		/* First switch to alt set 0, otherwise the mode switch cmd
 		 * will not be accepted by the DAC
 		 */
@@ -1622,10 +1596,8 @@ void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep)
 		ep->tenor_fb_quirk = 1;
 }
 
-void snd_usb_set_interface_quirk(struct usb_device *dev)
+void snd_usb_set_interface_quirk(struct snd_usb_audio *chip)
 {
-	struct snd_usb_audio *chip = dev_get_drvdata(&dev->dev);
-
 	if (!chip)
 		return;
 	/*
@@ -1672,13 +1644,13 @@ void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
 	    && (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
 		msleep(20);
 
-	/* Zoom R16/24, Logitech H650e/H570e, Jabra 550a, Kingston HyperX
-	 *  needs a tiny delay here, otherwise requests like get/set
-	 *  frequency return as failed despite actually succeeding.
+	/* Zoom R16/24, many Logitech(at least H650e/H570e/BCC950),
+	 * Jabra 550a, Kingston HyperX needs a tiny delay here,
+	 * otherwise requests like get/set frequency return
+	 * as failed despite actually succeeding.
 	 */
 	if ((chip->usb_id == USB_ID(0x1686, 0x00dd) ||
-	     chip->usb_id == USB_ID(0x046d, 0x0a46) ||
-	     chip->usb_id == USB_ID(0x046d, 0x0a56) ||
+	     USB_ID_VENDOR(chip->usb_id) == 0x046d  || /* Logitech */
 	     chip->usb_id == USB_ID(0x0b0e, 0x0349) ||
 	     chip->usb_id == USB_ID(0x0951, 0x16ad)) &&
 	    (requesttype & USB_TYPE_MASK) == USB_TYPE_CLASS)
@@ -1800,6 +1772,7 @@ u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
 	case 0x278b:  /* Rotel? */
 	case 0x292b:  /* Gustard/Ess based devices */
 	case 0x2ab6:  /* T+A devices */
+	case 0x3353:  /* Khadas devices */
 	case 0x3842:  /* EVGA */
 	case 0xc502:  /* HiBy devices */
 		if (fp->dsd_raw)
diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
index c76cf24a640a..67a02303c820 100644
--- a/sound/usb/quirks.h
+++ b/sound/usb/quirks.h
@@ -26,22 +26,22 @@ int snd_usb_apply_boot_quirk_once(struct usb_device *dev,
 				  unsigned int usb_id);
 
 void snd_usb_set_format_quirk(struct snd_usb_substream *subs,
-			      struct audioformat *fmt);
+			      const struct audioformat *fmt);
 
 bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip);
 
 int snd_usb_is_big_endian_format(struct snd_usb_audio *chip,
-				 struct audioformat *fp);
+				 const struct audioformat *fp);
 
 void snd_usb_endpoint_start_quirk(struct snd_usb_endpoint *ep);
 
-void snd_usb_set_interface_quirk(struct usb_device *dev);
+void snd_usb_set_interface_quirk(struct snd_usb_audio *chip);
 void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
 			   __u8 request, __u8 requesttype, __u16 value,
 			   __u16 index, void *data, __u16 size);
 
-int snd_usb_select_mode_quirk(struct snd_usb_substream *subs,
-			      struct audioformat *fmt);
+int snd_usb_select_mode_quirk(struct snd_usb_audio *chip,
+			      const struct audioformat *fmt);
 
 u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
 					struct audioformat *fp,
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index ca76ba5b5c0b..7f58c7625cd4 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -47,7 +47,6 @@ static void free_substream(struct snd_usb_substream *subs)
 		return; /* not initialized */
 	list_for_each_entry_safe(fp, n, &subs->fmt_list, list)
 		audioformat_free(fp);
-	kfree(subs->rate_list.list);
 	kfree(subs->str_pd);
 	snd_media_stream_delete(subs);
 }
@@ -1194,6 +1193,8 @@ static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
 			continue;
 		}
 
+		snd_usb_audioformat_set_sync_ep(chip, fp);
+
 		dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
 		if (protocol == UAC_VERSION_3)
 			err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
@@ -1205,10 +1206,27 @@ static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
 			kfree(pd);
 			return err;
 		}
+
+		/* add endpoints */
+		err = snd_usb_add_endpoint(chip, fp->endpoint,
+					   SND_USB_ENDPOINT_TYPE_DATA);
+		if (err < 0)
+			return err;
+
+		if (fp->sync_ep) {
+			err = snd_usb_add_endpoint(chip, fp->sync_ep,
+						   fp->implicit_fb ?
+						   SND_USB_ENDPOINT_TYPE_DATA :
+						   SND_USB_ENDPOINT_TYPE_SYNC);
+			if (err < 0)
+				return err;
+		}
+
 		/* try to set the interface... */
+		usb_set_interface(chip->dev, iface_no, 0);
+		snd_usb_init_pitch(chip, fp);
+		snd_usb_init_sample_rate(chip, fp, fp->rate_max);
 		usb_set_interface(chip->dev, iface_no, altno);
-		snd_usb_init_pitch(chip, iface_no, alts, fp);
-		snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
 	}
 	return 0;
 }
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 0805b7f21272..980287aadd36 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -35,7 +35,6 @@ struct snd_usb_audio {
 	wait_queue_head_t shutdown_wait;
 	unsigned int txfr_quirk:1; /* Subframe boundaries on transfers */
 	unsigned int tx_length_quirk:1; /* Put length specifier in transfers */
-	unsigned int setup_fmt_after_resume_quirk:1; /* setup the format to interface after resume */
 	unsigned int need_delayed_register:1; /* warn for delayed registration */
 	int num_interfaces;
 	int num_suspended_intf;
@@ -52,10 +51,8 @@ struct snd_usb_audio {
 	struct list_head mixer_list;	/* list of mixer interfaces */
 
 	int setup;			/* from the 'device_setup' module param */
+	bool generic_implicit_fb;	/* from the 'implicit_fb' module param */
 	bool autoclock;			/* from the 'autoclock' module param */
-	bool keep_iface;		/* keep interface/altset after closing
-					 * or parameter change
-					 */
 
 	struct usb_host_interface *ctrl_intf;	/* the audio control interface */
 	struct media_device *media_dev;