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

[Chris Wilson]

On Wed, Apr 05, 2017 at 11:04:34AM +0530, Sagar Arun Kamble wrote:
> During S3/S4 suspend, i915 sends HOST2GUC with ENTER_S_STATE action
> for suspending GuC. GuC stops scheduling at this point. i915 is
> currently doing explicit GPU reset during suspend ensuring GEM is idle.
> Suspend GuC prior to triggering GPU Reset to ensure GuC stays idle too.

Why would a gpu reset cause the guc to think it was not idle, and
futhermore ignore the suspend request afterwards? Should we not be
completely disabling the guc along the system suspend path? Especially
if it is so easily confused?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre