[PATCH] drm/omap: Fix issue with clocks left on after resume

[Tony Lindgren]

* Tony Lindgren <tony at atomide.com> [210427 10:12]:
> * Tomi Valkeinen <tomi.valkeinen at ideasonboard.com> [210427 08:47]:
> > If I understand right, this is only an issue when the dss was not enabled
> > before the system suspend? And as the dispc is not enabled at suspend,
> > pm_runtime_force_suspend and pm_runtime_force_resume don't really do
> > anything. At resume, the DRM resume functionality causes omapdrm to call
> > pm_runtime_get and put, and this somehow causes the dss to stay enabled.
> 
> We do have dss enabled at system suspend from omap_atomic_comit_tail()
> until pm_runtime_force_suspend(). Then we have pm_runtime_force_resume()
> enable it.

Sorry I already forgot that pm_runtime_force_resume() is not enabling
it because pm_runtime_need_not_resume().. It's the omapdrm calling
pm_runtime_get() that enables the hardware on resume.

> Then on resume PM runtime prevents disable of the hardware on resume path
> until after device_complete(). Until then we have rpm_suspend() return
> -EBUSY, and so the parent child_count is not going to get decreased.
> Something would have to handle the -EBUSY error here it seems.

Regards,

Tony