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usb: dwc3: support continuous runtime PM with dual role

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commit c2cd3452d5f8b66d49a73138fba5baadd5b489bd upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Martin Kepplinger 2020-03-19 11:02:07 +01:00 • committed by Greg Kroah-Hartman
commit bd4c12b86c
1 changed files with 8 additions and 3 deletions
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11
drivers/usb/dwc3/core.c
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@ -122,17 +122,19 @@ 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:
@ -196,6 +198,9 @@ 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)