The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Thanks, Sasha
------------------ original commit in Linus's tree ------------------
From 6661befe41009c210efa2c1bcd16a5cc4cff8a06 Mon Sep 17 00:00:00 2001 From: Roger Quadros rogerq@kernel.org Date: Tue, 27 Feb 2024 11:23:48 +0200 Subject: [PATCH] usb: dwc3-am62: fix module unload/reload behavior
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
We called of_platform_populate() in .probe() so call the cleanup function of_platform_depopulate() in .remove(). Get rid of the now unnnecessary dwc3_ti_remove_core(). Without this, module re-load doesn't work properly.
Fixes: e8784c0aec03 ("drivers: usb: dwc3: Add AM62 USB wrapper driver") Cc: stable@vger.kernel.org # v5.19+ Signed-off-by: Roger Quadros rogerq@kernel.org Link: https://lore.kernel.org/r/20240227-for-v6-9-am62-usb-errata-3-0-v4-1-0ada8dd... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/dwc3-am62.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c index 90a587bc29b74..f85603b7f7c5e 100644 --- a/drivers/usb/dwc3/dwc3-am62.c +++ b/drivers/usb/dwc3/dwc3-am62.c @@ -267,21 +267,14 @@ static int dwc3_ti_probe(struct platform_device *pdev) return ret; }
-static int dwc3_ti_remove_core(struct device *dev, void *c) -{ - struct platform_device *pdev = to_platform_device(dev); - - platform_device_unregister(pdev); - return 0; -} - static void dwc3_ti_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct dwc3_am62 *am62 = platform_get_drvdata(pdev); u32 reg;
- device_for_each_child(dev, NULL, dwc3_ti_remove_core); + pm_runtime_get_sync(dev); + of_platform_depopulate(dev);
/* Clear mode valid bit */ reg = dwc3_ti_readl(am62, USBSS_MODE_CONTROL); @@ -289,7 +282,6 @@ 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); }