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>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 7c8d3bedf802c31e1bf7613c66b97f287809bdeb..814c986fc7bed402482268da4a8f3b7d28a50fc6 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -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: