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usb: dwc3: core: Fix broken system suspend/resume on AM437x 

On TI's AM437x, the DWC3 controller looses state after a
system suspend/resume. We are re-initializing the controller
but we miss restoring the PRTCAP register. This causes
USB host to break on AM437x after a system suspend/resume.

Fix this by restoring the PRTCAP register on system resume.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Roger Quadros 2018-03-16 16:44:27 +02:00 committed by Felipe Balbi
parent 2f3090c6a8
commit 7d11c3ac66
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/dwc3/core.c
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@ -1440,6 +1440,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
if (ret)
return ret;
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
spin_lock_irqsave(&dwc->lock, flags);
dwc3_gadget_resume(dwc);
spin_unlock_irqrestore(&dwc->lock, flags);
@ -1450,6 +1451,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
ret = dwc3_core_init(dwc);
if (ret)
return ret;
dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
}
break;
case DWC3_GCTL_PRTCAP_OTG: