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Commit 7d11c3ac authored by Roger Quadros's avatar Roger Quadros Committed by Felipe Balbi
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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: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 2f3090c6

drivers/usb/dwc3/core.c

+2 −0
Original line number Diff line number Diff line
@@ -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: