In the case hcd autosuspend is enabled, the hcd will enter L2 state if no device connected. But if the controller works in otg mode, the gadget driver still works in L0 state if connected with host. This may result in transfer fail when gadget enqueue new request but the hcd driver has set the global state into L2. This patch prevent the hcd enter L2 state if the controller work in device mode. Signed-off-by: Meng Dongyang <daniel.meng@xxxxxxxxxxxxxx> --- Changes in v2:None drivers/usb/dwc2/hcd.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 740c7e8..c263114 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -4388,6 +4388,9 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd) spin_lock_irqsave(&hsotg->lock, flags); + if (dwc2_is_device_mode(hsotg)) + goto unlock; + if (hsotg->lx_state != DWC2_L0) goto unlock; @@ -4446,6 +4449,9 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd) spin_lock_irqsave(&hsotg->lock, flags); + if (dwc2_is_device_mode(hsotg)) + goto unlock; + if (hsotg->lx_state != DWC2_L2) goto unlock; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
