5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tomas Marek <tomas.marek@xxxxxxxxx>
commit 2c6b6afa59e78bebcb65bbc8a76b3459f139547c upstream.
The dwc2_handle_usb_suspend_intr() function disables gadget clocks in USB
peripheral mode when no other power-down mode is available (introduced by
commit 0112b7ce68ea ("usb: dwc2: Update dwc2_handle_usb_suspend_intr function.")).
However, the dwc2_drd_role_sw_set() USB role update handler attempts to
read DWC2 registers if the USB role has changed while the USB is in suspend
mode (when the clocks are gated). This causes the system to hang.
Release the gadget clocks before handling the USB role update.
Fixes: 0112b7ce68ea ("usb: dwc2: Update dwc2_handle_usb_suspend_intr function.")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Tomas Marek <tomas.marek@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240906055025.25057-1-tomas.marek@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc2/drd.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/drivers/usb/dwc2/drd.c
+++ b/drivers/usb/dwc2/drd.c
@@ -105,6 +105,15 @@ static int dwc2_drd_role_sw_set(struct u
spin_lock_irqsave(&hsotg->lock, flags);
+ if ((IS_ENABLED(CONFIG_USB_DWC2_PERIPHERAL) ||
+ IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)) &&
+ dwc2_is_device_mode(hsotg) &&
+ hsotg->lx_state == DWC2_L2 &&
+ hsotg->params.power_down == DWC2_POWER_DOWN_PARAM_NONE &&
+ hsotg->bus_suspended &&
+ !hsotg->params.no_clock_gating)
+ dwc2_gadget_exit_clock_gating(hsotg, 0);
+
if (role == USB_ROLE_HOST) {
already = dwc2_ovr_avalid(hsotg, true);
} else if (role == USB_ROLE_DEVICE) {
