[Intel-gfx] [PATCH v4] drm/i915/uc: Add explicit DISABLED state for firmware

[Chris Wilson]

Quoting Michal Wajdeczko (2019-08-16 21:56:58)
> We really need to have separate NOT_SUPPORTED state (for
> lack of hardware support) and DISABLED state (to indicate
> user decision) as we will have to take special steps even
> if GuC firmware is now disabled but hardware exists and
> could have been previously used.
> 
> v2: fix logic (Chris/CI)
> v3: use proper check to avoid probe failure (CI)
> v4: explain status transitions (Chris)
> 
> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris