[Intel-gfx] [PATCH 1/2] drm/i915/guc: Limit number of scratch registers used for H2G

[Chris Wilson]

Quoting Michal Wajdeczko (2018-10-16 10:42:06)
> We wrongly assumed that GuC is only using last scratch register
> for G2H messages, but in fact it is also using register [14] to
> report sleep state status. Remove that register from our H2G
> send registers pool.

I'll leave it up to you and Daniele to work out if it is being
exclusively used for this purpose or if it is just part of the response
for the suspend/resume message.
-Chris