From f367b72c4e08aafacc5267c73299a62ca79635ec Mon Sep 17 00:00:00 2001 From: Meng Dongyang Date: Wed, 9 Aug 2017 10:34:09 +0800 Subject: [PATCH] usb: dwc2: skip L2 state of hcd if controller work in device mode 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 Signed-off-by: Felipe Balbi --- 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; -- 2.7.4