usb: dwc3: support continuous runtime PM with dual role

The DRD module calls dwc3_set_mode() on role switches, i.e. when a device is
being plugged in. In order to support continuous runtime power management when
plugging in / unplugging a cable, we need to call pm_runtime_get_sync() in
this path.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index edc1715..7046c68 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -121,17 +121,19 @@ static void __dwc3_set_mode(struct work_struct *work)
        if (dwc->dr_mode != USB_DR_MODE_OTG)
                return;
 
+       pm_runtime_get_sync(dwc->dev);
+
        if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG)
                dwc3_otg_update(dwc, 0);
 
        if (!dwc->desired_dr_role)
-               return;
+               goto out;
 
        if (dwc->desired_dr_role == dwc->current_dr_role)
-               return;
+               goto out;
 
        if (dwc->desired_dr_role == DWC3_GCTL_PRTCAP_OTG && dwc->edev)
-               return;
+               goto out;
 
        switch (dwc->current_dr_role) {
        case DWC3_GCTL_PRTCAP_HOST:
@@ -190,6 +192,9 @@ static void __dwc3_set_mode(struct work_struct *work)
                break;
        }
 
+out:
+       pm_runtime_mark_last_busy(dwc->dev);
+       pm_runtime_put_autosuspend(dwc->dev);
 }
 
 void dwc3_set_mode(struct dwc3 *dwc, u32 mode)