shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 03:15:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

usb: dwc2: skip L2 state of hcd if controller work in device mode

Browse Source 
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.

Change-Id: If31873bebf05c100cf74e49c7d2813160a808f1e
Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
This commit is contained in:
Meng Dongyang
2017-08-09 10:34:09 +08:00
committed by Huang, Tao
parent e7cd2221ad
commit ce21864e42
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/dwc2/hcd.c
View File

@@ -4361,6 +4361,9 @@ 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;
@@ -4416,6 +4419,9 @@ 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;