[PATCH] drm/omap: force runtime PM suspend on system suspend

[Tony Lindgren]

* Tomi Valkeinen <tomi.valkeinen at ti.com> [200609 16:27]:
> On 09/06/2020 19:10, Tony Lindgren wrote:
> > Yeah so it seems. Can we just diconnect the display outputs
> > in .prepare somewhere? Or is that the wrong place to do it?
> 
> Hmm, yes, perhaps... If omapdrm uses .prepare to disable all the outputs.
> Then DSS submodules could use UNIVERSAL_DEV_PM_OPS() and have the same
> functions for system and runtime suspend.

Yeah that would be nice. And maybe the need for force_suspend
also disappears with the ordering issues gone :)

> Although that has the problem that if the DSS is already runtime suspended
> when system suspend happens, the PM does not wake DSS up, and thus the
> suspend callbacks will crash if they access registers. So they need some
> extra logic there.
> 
> I'll see tomorrow if I can come up with something like that.

OK. This $subject patch works for my test cases for suspend
and resume based on a brief test with my fixes branch FYI.

Regards,

Tony