[Intel-gfx] [PATCH] drm/i915: Re-enable per-engine reset for Broxton

[Chris Wilson]

Quoting Michel Thierry (2017-08-18 18:23:42)
> The corruption in CSB mmio reads we were seeing has been tracked down to
> incorrectly touching forcewake of all domains, following an engine reset.
> It is still a mistery why we only catched this in Broxton, since it
> could happen in any platform.
> 
> With that fix already merged, commit 4055dc75d6b5 ("drm/i915: Stop
> touching forcewake following a gen6+ engine reset"), lets try to enable
> per-engine resets in Broxton one more time.
> 
> This reverts commit f188258bde0f ("drm/i915: Disable per-engine reset for
> Broxton").
> 
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Michel Thierry <michel.thierry at intel.com>

My bxt has survived about 72 hours of hang testing, which is far more
than it was able to previously.

Acked-by: Chris Wilson <chris at chris-wilson.co.uk>
Tested-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris