PM regression with commit 5de85b9d57ab PM runtime re-init in v4.5-rc1

[Tony Lindgren]

* Rafael J. Wysocki <rafael at kernel.org> [160201 14:18]:
> On Mon, Feb 1, 2016 at 11:06 PM, Tony Lindgren <tony at atomide.com> wrote:
> > --- a/drivers/base/power/runtime.c
> > +++ b/drivers/base/power/runtime.c
> > @@ -1419,17 +1419,25 @@ void pm_runtime_init(struct device *dev)
> >   */
> >  void pm_runtime_reinit(struct device *dev)
> >  {
> > -       if (!pm_runtime_enabled(dev)) {
> > -               if (dev->power.runtime_status == RPM_ACTIVE)
> > +       if (pm_runtime_enabled(dev))
> > +               return;
> > +
> > +       if (dev->power.runtime_status == RPM_ACTIVE) {
> > +               if (dev->power.use_autosuspend) {
> > +                       __pm_runtime_use_autosuspend(dev, false);
> > +                       pm_runtime_suspend(dev);
> 
> This won't work, because runtime PM is disabled at this point.

Hmm right OK. It does work from idling the hardware point
of view though..

> What about doing this instead:
> 
>                if (dev->power.use_autosuspend)
>                        __pm_runtime_use_autosuspend(dev, false);
> 
>                pm_runtime_set_suspended(dev);

..while this does not work. The hardware is never idled
in this case.

What else does __pm_runtime_use_autosuspend() set initially
that changes things here?

Regards,

Tony