[Intel-gfx] [PATCH v2 1/1] drm/i915: Suspend GuC prior to GPU Reset during GEM suspend

[Joonas Lahtinen]

On ke, 2017-04-05 at 15:51 +0530, Sagar Arun Kamble wrote:
> i915 is currently doing Full GPU reset at the end of suspend followed by
> GuC suspend. This reset bypasses the GuC. We need to tell the GuC to
> suspend before we do a direct intel_gpu_reset, Otherwise the gpu state will
> no longer match the GuC's expectations and its suspend will not be
> successful. With this change, i915 suspends GuC after suspending GEM and
> before doing Full GPU reset.

+ David, Oscar and Michel

My understanding is that reloading GuC firmware after each resume is a
major bottleneck in resume time, and we instead should be telling GuC
to suspend and not reset the GPU, at most only reset the engines.

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation