6.6-stable review patch. If anyone has any objections, please let me know.
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From: Udipto Goswami udipto.goswami@oss.qualcomm.com
commit e1003aa7ec9eccdde4c926bd64ef42816ad55f25 upstream.
On some platforms, switching USB roles from host to device can trigger controller faults due to premature PHY power-down. This occurs when the PHY is disabled too early during teardown, causing synchronization issues between the PHY and controller.
Keep susphy enabled during dwc3_host_exit() and dwc3_gadget_exit() ensures the PHY remains in a low-power state capable of handling required commands during role switch.
Cc: stable stable@kernel.org Fixes: 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init") Suggested-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Signed-off-by: Udipto Goswami udipto.goswami@oss.qualcomm.com Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://patch.msgid.link/20251126054221.120638-1-udipto.goswami@oss.qualcomm... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/gadget.c | 2 +- drivers/usb/dwc3/host.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -4807,7 +4807,7 @@ void dwc3_gadget_exit(struct dwc3 *dwc) if (!dwc->gadget) return;
- dwc3_enable_susphy(dwc, false); + dwc3_enable_susphy(dwc, true); usb_del_gadget(dwc->gadget); dwc3_gadget_free_endpoints(dwc); usb_put_gadget(dwc->gadget); --- a/drivers/usb/dwc3/host.c +++ b/drivers/usb/dwc3/host.c @@ -168,7 +168,7 @@ void dwc3_host_exit(struct dwc3 *dwc) if (dwc->sys_wakeup) device_init_wakeup(&dwc->xhci->dev, false);
- dwc3_enable_susphy(dwc, false); + dwc3_enable_susphy(dwc, true); platform_device_unregister(dwc->xhci); dwc->xhci = NULL; }