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usb: gadget: tegra-xudc: fix PM use count underflow

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Upon resume from system suspend, the PM runtime core issues the
following warning:

tegra-xudc 3550000.usb: Runtime PM usage count underflow!

This is because tegra_xudc_resume() unconditionally calls
schedule_work(&xudc->usb_role_sw_work) whether or not anything has
changed, which causes tegra_xudc_device_mode_off() to be called
even when we're already in that mode.

Keep track of the current state of "device_mode", and only schedule
this work if it has changed from the hardware state on resume.

Signed-off-by: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1uhtkH-007KDZ-JT@rmk-PC.armlinux.org.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell King (Oracle) 2025-08-01 18:40:41 +01:00 • committed by Greg Kroah-Hartman
parent e664036cf3
commit 202ad1aaca
1 changed files with 7 additions and 2 deletions
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9
drivers/usb/gadget/udc/tegra-xudc.c
View file

@ -502,6 +502,7 @@ struct tegra_xudc {
struct clk_bulk_data *clks;
bool device_mode;
bool current_device_mode;
struct work_struct usb_role_sw_work;
struct phy **usb3_phy;
@ -715,6 +716,8 @@ static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
phy_set_mode_ext(xudc->curr_utmi_phy, PHY_MODE_USB_OTG,
USB_ROLE_DEVICE);
xudc->current_device_mode = true;
}
static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
@ -725,6 +728,8 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
dev_dbg(xudc->dev, "device mode off\n");
xudc->current_device_mode = false;
connected = !!(xudc_readl(xudc, PORTSC) & PORTSC_CCS);
reinit_completion(&xudc->disconnect_complete);
@ -4044,10 +4049,10 @@ static int __maybe_unused tegra_xudc_resume(struct device *dev)
spin_lock_irqsave(&xudc->lock, flags);
xudc->suspended = false;
if (xudc->device_mode != xudc->current_device_mode)
schedule_work(&xudc->usb_role_sw_work);
spin_unlock_irqrestore(&xudc->lock, flags);
schedule_work(&xudc->usb_role_sw_work);
pm_runtime_enable(dev);
return 0;