Re: [PATCH] drm/msm/dpu: ensure device suspend happens during PM sleep

Hi,

On Sun, Mar 22, 2020 at 11:14 PM Kalyan Thota [off-list ref] wrote:

"The PM core always increments the runtime usage counter
before calling the ->suspend() callback and decrements it
after calling the ->resume() callback"

DPU and DSI are managed as runtime devices. When
suspend is triggered, PM core adds a refcount on all the
devices and calls device suspend, since usage count is
already incremented, runtime suspend was not getting called
and it kept the clocks on which resulted in target not
entering into XO shutdown.

Add changes to manage runtime devices during pm sleep.

Changes in v1:
 - Remove unnecessary checks in the function
     _dpu_kms_disable_dpu (Rob Clark).

I'm wondering what happened with my feedback on v1, AKA:

https://lore.kernel.org/r/CAD=FV=VxzEV40g+ieuEN+7o=34+wM8MHO8o7T5zA1Yosx7SVWg@mail.gmail.com (local)

Maybe you didn't see it?  ...or if you or Rob think I'm way off base
(always possible) then please tell me so.

Thanks!

-Doug