From b9cff71c509bd97880e277e798e7dbf8a853192b Mon Sep 17 00:00:00 2001 From: Lad Prabhakar Date: Mon, 7 Apr 2025 11:50:00 +0100 Subject: usb: renesas_usbhs: Correct function references in comment Update the comment to reference `usbhs_mod_probe()` instead of `usbhs_mod_init()`, and replace `dev_set_drvdata()` with `platform_set_drvdata()`, as these are the correct functions used in this context. Signed-off-by: Lad Prabhakar Acked-by: Kuninori Morimoto Reviewed-by: Yoshihiro Shimoda Link: https://lore.kernel.org/r/20250407105002.107181-2-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/renesas_usbhs/common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/usb/renesas_usbhs/common.c') diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c index 4b35ef216125..03d4d40c90b3 100644 --- a/drivers/usb/renesas_usbhs/common.c +++ b/drivers/usb/renesas_usbhs/common.c @@ -698,7 +698,7 @@ static int usbhs_probe(struct platform_device *pdev) if (ret < 0) goto probe_end_fifo_exit; - /* dev_set_drvdata should be called after usbhs_mod_init */ + /* platform_set_drvdata() should be called after usbhs_mod_probe() */ platform_set_drvdata(pdev, priv); ret = reset_control_deassert(priv->rsts); -- cgit v1.2.3 From 8fb4c9d7c113f9987bfae79f308b2e498cc9792e Mon Sep 17 00:00:00 2001 From: Lad Prabhakar Date: Mon, 7 Apr 2025 11:50:01 +0100 Subject: usb: renesas_usbhs: Fix typo in comment Fix a typo in the comment by correcting "deviece" to "device" for clarity and readability. Signed-off-by: Lad Prabhakar Acked-by: Kuninori Morimoto Reviewed-by: Yoshihiro Shimoda Link: https://lore.kernel.org/r/20250407105002.107181-3-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/renesas_usbhs/common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/usb/renesas_usbhs/common.c') diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c index 03d4d40c90b3..703cf5d0cb41 100644 --- a/drivers/usb/renesas_usbhs/common.c +++ b/drivers/usb/renesas_usbhs/common.c @@ -710,7 +710,7 @@ static int usbhs_probe(struct platform_device *pdev) goto probe_fail_clks; /* - * deviece reset here because + * device reset here because * USB device might be used in boot loader. */ usbhs_sys_clock_ctrl(priv, 0); -- cgit v1.2.3 From ffb34a60ce86656ba12d46e91f1ccc71dd221251 Mon Sep 17 00:00:00 2001 From: Lad Prabhakar Date: Mon, 7 Apr 2025 11:50:02 +0100 Subject: usb: renesas_usbhs: Reorder clock handling and power management in probe Reorder the initialization sequence in `usbhs_probe()` to enable runtime PM before accessing registers, preventing potential crashes due to uninitialized clocks. Currently, in the probe path, registers are accessed before enabling the clocks, leading to a synchronous external abort on the RZ/V2H SoC. The problematic call flow is as follows: usbhs_probe() usbhs_sys_clock_ctrl() usbhs_bset() usbhs_write() iowrite16() <-- Register access before enabling clocks Since `iowrite16()` is performed without ensuring the required clocks are enabled, this can lead to access errors. To fix this, enable PM runtime early in the probe function and ensure clocks are acquired before register access, preventing crashes like the following on RZ/V2H: [13.272640] Internal error: synchronous external abort: 0000000096000010 [#1] PREEMPT SMP [13.280814] Modules linked in: cec renesas_usbhs(+) drm_kms_helper fuse drm backlight ipv6 [13.289088] CPU: 1 UID: 0 PID: 195 Comm: (udev-worker) Not tainted 6.14.0-rc7+ #98 [13.296640] Hardware name: Renesas RZ/V2H EVK Board based on r9a09g057h44 (DT) [13.303834] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [13.310770] pc : usbhs_bset+0x14/0x4c [renesas_usbhs] [13.315831] lr : usbhs_probe+0x2e4/0x5ac [renesas_usbhs] [13.321138] sp : ffff8000827e3850 [13.324438] x29: ffff8000827e3860 x28: 0000000000000000 x27: ffff8000827e3ca0 [13.331554] x26: ffff8000827e3ba0 x25: ffff800081729668 x24: 0000000000000025 [13.338670] x23: ffff0000c0f08000 x22: 0000000000000000 x21: ffff0000c0f08010 [13.345783] x20: 0000000000000000 x19: ffff0000c3b52080 x18: 00000000ffffffff [13.352895] x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000827e36ce [13.360009] x14: 00000000000003d7 x13: 00000000000003d7 x12: 0000000000000000 [13.367122] x11: 0000000000000000 x10: 0000000000000aa0 x9 : ffff8000827e3750 [13.374235] x8 : ffff0000c1850b00 x7 : 0000000003826060 x6 : 000000000000001c [13.381347] x5 : 000000030d5fcc00 x4 : ffff8000825c0000 x3 : 0000000000000000 [13.388459] x2 : 0000000000000400 x1 : 0000000000000000 x0 : ffff0000c3b52080 [13.395574] Call trace: [13.398013] usbhs_bset+0x14/0x4c [renesas_usbhs] (P) [13.403076] platform_probe+0x68/0xdc [13.406738] really_probe+0xbc/0x2c0 [13.410306] __driver_probe_device+0x78/0x120 [13.414653] driver_probe_device+0x3c/0x154 [13.418825] __driver_attach+0x90/0x1a0 [13.422647] bus_for_each_dev+0x7c/0xe0 [13.426470] driver_attach+0x24/0x30 [13.430032] bus_add_driver+0xe4/0x208 [13.433766] driver_register+0x68/0x130 [13.437587] __platform_driver_register+0x24/0x30 [13.442273] renesas_usbhs_driver_init+0x20/0x1000 [renesas_usbhs] [13.448450] do_one_initcall+0x60/0x1d4 [13.452276] do_init_module+0x54/0x1f8 [13.456014] load_module+0x1754/0x1c98 [13.459750] init_module_from_file+0x88/0xcc [13.464004] __arm64_sys_finit_module+0x1c4/0x328 [13.468689] invoke_syscall+0x48/0x104 [13.472426] el0_svc_common.constprop.0+0xc0/0xe0 [13.477113] do_el0_svc+0x1c/0x28 [13.480415] el0_svc+0x30/0xcc [13.483460] el0t_64_sync_handler+0x10c/0x138 [13.487800] el0t_64_sync+0x198/0x19c [13.491453] Code: 2a0103e1 12003c42 12003c63 8b010084 (79400084) [13.497522] ---[ end trace 0000000000000000 ]--- Fixes: f1407d5c66240 ("usb: renesas_usbhs: Add Renesas USBHS common code") Signed-off-by: Lad Prabhakar Reviewed-by: Yoshihiro Shimoda Tested-by: Yoshihiro Shimoda Link: https://lore.kernel.org/r/20250407105002.107181-4-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/renesas_usbhs/common.c | 50 +++++++++++++++++++++++++++++--------- 1 file changed, 38 insertions(+), 12 deletions(-) (limited to 'drivers/usb/renesas_usbhs/common.c') diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c index 703cf5d0cb41..f52418fe3fd4 100644 --- a/drivers/usb/renesas_usbhs/common.c +++ b/drivers/usb/renesas_usbhs/common.c @@ -685,10 +685,29 @@ static int usbhs_probe(struct platform_device *pdev) INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug); spin_lock_init(usbhs_priv_to_lock(priv)); + /* + * Acquire clocks and enable power management (PM) early in the + * probe process, as the driver accesses registers during + * initialization. Ensure the device is active before proceeding. + */ + pm_runtime_enable(dev); + + ret = usbhsc_clk_get(dev, priv); + if (ret) + goto probe_pm_disable; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + goto probe_clk_put; + + ret = usbhsc_clk_prepare_enable(priv); + if (ret) + goto probe_pm_put; + /* call pipe and module init */ ret = usbhs_pipe_probe(priv); if (ret < 0) - return ret; + goto probe_clk_dis_unprepare; ret = usbhs_fifo_probe(priv); if (ret < 0) @@ -705,10 +724,6 @@ static int usbhs_probe(struct platform_device *pdev) if (ret) goto probe_fail_rst; - ret = usbhsc_clk_get(dev, priv); - if (ret) - goto probe_fail_clks; - /* * device reset here because * USB device might be used in boot loader. @@ -721,7 +736,7 @@ static int usbhs_probe(struct platform_device *pdev) if (ret) { dev_warn(dev, "USB function not selected (GPIO)\n"); ret = -ENOTSUPP; - goto probe_end_mod_exit; + goto probe_assert_rest; } } @@ -735,14 +750,19 @@ static int usbhs_probe(struct platform_device *pdev) ret = usbhs_platform_call(priv, hardware_init, pdev); if (ret < 0) { dev_err(dev, "platform init failed.\n"); - goto probe_end_mod_exit; + goto probe_assert_rest; } /* reset phy for connection */ usbhs_platform_call(priv, phy_reset, pdev); - /* power control */ - pm_runtime_enable(dev); + /* + * Disable the clocks that were enabled earlier in the probe path, + * and let the driver handle the clocks beyond this point. + */ + usbhsc_clk_disable_unprepare(priv); + pm_runtime_put(dev); + if (!usbhs_get_dparam(priv, runtime_pwctrl)) { usbhsc_power_ctrl(priv, 1); usbhs_mod_autonomy_mode(priv); @@ -759,9 +779,7 @@ static int usbhs_probe(struct platform_device *pdev) return ret; -probe_end_mod_exit: - usbhsc_clk_put(priv); -probe_fail_clks: +probe_assert_rest: reset_control_assert(priv->rsts); probe_fail_rst: usbhs_mod_remove(priv); @@ -769,6 +787,14 @@ probe_end_fifo_exit: usbhs_fifo_remove(priv); probe_end_pipe_exit: usbhs_pipe_remove(priv); +probe_clk_dis_unprepare: + usbhsc_clk_disable_unprepare(priv); +probe_pm_put: + pm_runtime_put(dev); +probe_clk_put: + usbhsc_clk_put(priv); +probe_pm_disable: + pm_runtime_disable(dev); dev_info(dev, "probe failed (%d)\n", ret); -- cgit v1.2.3