1 files changed, 88 insertions, 0 deletions

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 837979ea5c92..59f234e51971 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -652,6 +652,24 @@ static const struct snd_soc_component_driver fsl_esai_component = {
 	.name		= "fsl-esai",
 };
 
+static const struct reg_default fsl_esai_reg_defaults[] = {
+	{0x8,  0x00000000},
+	{0x10, 0x00000000},
+	{0x18, 0x00000000},
+	{0x98, 0x00000000},
+	{0xd0, 0x00000000},
+	{0xd4, 0x00000000},
+	{0xd8, 0x00000000},
+	{0xdc, 0x00000000},
+	{0xe0, 0x00000000},
+	{0xe4, 0x0000ffff},
+	{0xe8, 0x0000ffff},
+	{0xec, 0x0000ffff},
+	{0xf0, 0x0000ffff},
+	{0xf8, 0x00000000},
+	{0xfc, 0x00000000},
+};
+
 static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
@@ -684,6 +702,31 @@ static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
+static bool fsl_esai_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case REG_ESAI_ETDR:
+	case REG_ESAI_ERDR:
+	case REG_ESAI_ESR:
+	case REG_ESAI_TFSR:
+	case REG_ESAI_RFSR:
+	case REG_ESAI_TX0:
+	case REG_ESAI_TX1:
+	case REG_ESAI_TX2:
+	case REG_ESAI_TX3:
+	case REG_ESAI_TX4:
+	case REG_ESAI_TX5:
+	case REG_ESAI_RX0:
+	case REG_ESAI_RX1:
+	case REG_ESAI_RX2:
+	case REG_ESAI_RX3:
+	case REG_ESAI_SAISR:
+		return true;
+	default:
+		return false;
+	}
+}
+
 static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
@@ -721,8 +764,12 @@ static const struct regmap_config fsl_esai_regmap_config = {
 	.val_bits = 32,
 
 	.max_register = REG_ESAI_PCRC,
+	.reg_defaults = fsl_esai_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(fsl_esai_reg_defaults),
 	.readable_reg = fsl_esai_readable_reg,
+	.volatile_reg = fsl_esai_volatile_reg,
 	.writeable_reg = fsl_esai_writeable_reg,
+	.cache_type = REGCACHE_RBTREE,
 };
 
 static int fsl_esai_probe(struct platform_device *pdev)
@@ -853,10 +900,51 @@ static const struct of_device_id fsl_esai_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids);
 
+#ifdef CONFIG_PM_SLEEP
+static int fsl_esai_suspend(struct device *dev)
+{
+	struct fsl_esai *esai = dev_get_drvdata(dev);
+
+	regcache_cache_only(esai->regmap, true);
+	regcache_mark_dirty(esai->regmap);
+
+	return 0;
+}
+
+static int fsl_esai_resume(struct device *dev)
+{
+	struct fsl_esai *esai = dev_get_drvdata(dev);
+	int ret;
+
+	regcache_cache_only(esai->regmap, false);
+
+	/* FIFO reset for safety */
+	regmap_update_bits(esai->regmap, REG_ESAI_TFCR,
+			   ESAI_xFCR_xFR, ESAI_xFCR_xFR);
+	regmap_update_bits(esai->regmap, REG_ESAI_RFCR,
+			   ESAI_xFCR_xFR, ESAI_xFCR_xFR);
+
+	ret = regcache_sync(esai->regmap);
+	if (ret)
+		return ret;
+
+	/* FIFO reset done */
+	regmap_update_bits(esai->regmap, REG_ESAI_TFCR, ESAI_xFCR_xFR, 0);
+	regmap_update_bits(esai->regmap, REG_ESAI_RFCR, ESAI_xFCR_xFR, 0);
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops fsl_esai_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(fsl_esai_suspend, fsl_esai_resume)
+};
+
 static struct platform_driver fsl_esai_driver = {
 	.probe = fsl_esai_probe,
 	.driver = {
 		.name = "fsl-esai-dai",
+		.pm = &fsl_esai_pm_ops,
 		.of_match_table = fsl_esai_dt_ids,
 	},
 };