linux-kernel - [PATCH v3 2/5] usb: dwc3-am62: fix error on module removal

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Message-Id: <20240214-for-v6-9-am62-usb-errata-3-0-v3-2-147ec5eae18c@kernel.org>
Date: Wed, 14 Feb 2024 11:46:46 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: nm@...com, r-gunasekaran@...com, afd@...com, b-liu@...com, srk@...com, 
 francesco@...cini.it, linux-usb@...r.kernel.org, 
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
 Roger Quadros <rogerq@...nel.org>
Subject: [PATCH v3 2/5] usb: dwc3-am62: fix error on module removal

As runtime PM is enabled, the module can be runtime
suspended when .remove() is called.

Do a pm_runtime_get_sync() to make sure module is active
before doing any register operations.

Doing a pm_runtime_put_sync() should disable the refclk
so no need to disable it again.

Fixes the below warning at module removel.

[   39.705310] ------------[ cut here ]------------
[   39.710004] clk:162:3 already disabled
[   39.713941] WARNING: CPU: 0 PID: 921 at drivers/clk/clk.c:1090 clk_core_disable+0xb0/0xb8

Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
Changelog:

v3: no change

v2: no change
	https://lore.kernel.org/all/20240205141221.56076-3-rogerq@kernel.org/

v1: https://lore.kernel.org/all/20240201121220.5523-3-rogerq@kernel.org/
---
 drivers/usb/dwc3/dwc3-am62.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c
index 1bfc9e67614f..600ba9cfefea 100644
--- a/drivers/usb/dwc3/dwc3-am62.c
+++ b/drivers/usb/dwc3/dwc3-am62.c
@@ -273,6 +273,11 @@ static void dwc3_ti_remove(struct platform_device *pdev)
 	struct dwc3_am62 *am62 = platform_get_drvdata(pdev);
 	u32 reg;
 
+	pm_runtime_get_sync(dev);
+
+	device_wakeup_disable(dev);
+	device_set_wakeup_capable(dev, false);
+
 	of_platform_depopulate(dev);
 
 	/* Clear mode valid bit */
@@ -281,7 +286,6 @@ static void dwc3_ti_remove(struct platform_device *pdev)
 	dwc3_ti_writel(am62, USBSS_MODE_CONTROL, reg);
 
 	pm_runtime_put_sync(dev);
-	clk_disable_unprepare(am62->usb2_refclk);
 	pm_runtime_disable(dev);
 	pm_runtime_set_suspended(dev);
 }

-- 
2.34.1