Jun Li <lijun.kernel@xxxxxxxxx> 于2020年3月21日周六 下午6:59写道： > > Martin Kepplinger <martin.kepplinger@xxxxxxx> 于2020年3月19日周四 下午4:50写道： > > > > The DRD module calls dwc3_set_mode() on role switches, i.e. when a device is > > being pugged in. In order to support continuous runtime power management when > > plugging in / unplugging a cable, we need to call pm_runtime_get() in this path. > > > > Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxx> > > --- > > > > revision history > > ---------------- > > v2: move pm_rumtime calls into workqueue (thanks Roger) > > remove unrelated documentation patch > > v1: https://lore.kernel.org/linux-usb/ef22f8de-9bfd-c1d5-111c-696f1336dbda@xxxxxxx/T/ > > > > > > drivers/usb/dwc3/core.c | 11 ++++++++--- > > 1 file changed, 8 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > > index 1d85c42b9c67..0c058b2ac21d 100644 > > --- 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(dwc->dev); > > I think this needs _get_sync(), as the following mode settings may > require runtime resumed > to enable clocks... > See your v3, it's ok now. > Li Jun > > > + > > 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) > > -- > > 2.20.1 > >
