Hi Felipe,
> On Fri, Dec 13, 2013 at 01:56:18PM -0600, Felipe Balbi wrote:
> > On Fri, Dec 13, 2013 at 02:01:32PM +0900, Anton Tikhomirov wrote:
> > > Hi Felipe,
> > >
> > > > -static int dwc3_exynos_suspend(struct device *dev)
> > > > +static int __dwc3_exynos_suspend(struct dwc3_exynos *exynos)
> > > > {
> > > > - struct dwc3_exynos *exynos = dev_get_drvdata(dev);
> > > > -
> > > > clk_disable(exynos->clk);
> > > >
> > > > return 0;
> > > > }
> > > >
> > > > +static int __dwc3_exynos_resume(struct dwc3_exynos *exynos)
> > > > +{
> > > > + return clk_enable(exynos->clk);
> > > > +}
> > > > +
> > > > +static int dwc3_exynos_suspend(struct device *dev)
> > > > +{
> > > > + struct dwc3_exynos *exynos = dev_get_drvdata(dev);
> > > > +
> > > > + return __dwc3_exynos_suspend(exynos);
> > >
> > > If dwc3-exynos is runtime suspended, the clock will be disabled
> > > second time here (unbalanced clk_enable/clk_disable).
> >
> > I don't get what you mean but there is something that probably needs
> > fixing, I guess below makes it better:
> >
> > diff --git a/drivers/usb/dwc3/dwc3-exynos.c b/drivers/usb/dwc3/dwc3-
> exynos.c
> > index c93919a..1e5720a 100644
> > --- a/drivers/usb/dwc3/dwc3-exynos.c
> > +++ b/drivers/usb/dwc3/dwc3-exynos.c
> > @@ -218,6 +218,9 @@ static int dwc3_exynos_suspend(struct device *dev)
> > {
> > struct dwc3_exynos *exynos = dev_get_drvdata(dev);
> >
> > + if (pm_runtime_suspended(dev))
> > + return 0;
> > +
> > return __dwc3_exynos_suspend(exynos);
> > }
> >
> >
> > Is that what you meant ?
>
> note, however, that this is *not* a case where we would fall today. See
> that we pm_runtime_get() in probe and only pm_runtime_put() during
> remove. So there would never be a case where we would try system
> suspend
> while device was already runtime suspended.
You are right, while runtime PM is blocked by get_sync() in probe, this
check
doesn't matter.
>
> I have fixed all patches in my testing/next branch anyway, just to make
> sure we're "idiot-proof" when it comes to implementing real runtime pm
> later on :-)
>
> cheers
>
> --
> balbi
Thank you
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