[Intel-gfx] [PATCH v2 1/2] drm/i915/guc: fix GuC suspend/resume

[Chris Wilson]

Quoting Michal Wajdeczko (2018-10-17 17:40:50)
> On Wed, 17 Oct 2018 00:46:47 +0200, Daniele Ceraolo Spurio  
> <daniele.ceraolospurio at intel.com> wrote:
> 
> > The ENTER/EXIT_S_STATE actions queue the save/restore operation in GuC
> > FW and then return, so waiting on the H2G is not enough to guarantee
> > GuC is done.
> > When all the processing is done, GuC writes 0 to scratch register 14,
> > so we can poll on that. Note that GuC does not ensure that the value
> > in the register is different from 0 while the action is in progress
> > so we need to take care of that ourselves as well.
> >
> > v2: improve comment, return early on GuC error and improve error
> >     message (Michal)
> >
> > Cc: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
> > Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> > Acked-by: Chris Wilson <chris at chris-wilson.co.uk>
> > ---
> 
> Reviewed-by: Michal Wajdeczko <michal.wajdeczko at intel.com>

Applied, thanks for the fix and review.
-Chris