Quoting Michał Winiarski (2019-07-02 12:31:49)
> We missed one place where we check PPGTT-only platform for PPGTT
> presence. Let's remove it.
> While I'm here let's assert that this particular code is never called on
> pre-gen8 platforms.
>
> References: 4bdafb9ddfa4 ("drm/i915: Remove i915.enable_ppgtt override")
> Signed-off-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Hazy memory says that disabling pat (making everything uncached) was
desired for some early sanity checks. Hmm, there might be scope in here
for some selftests (to which I mean there is definitely room for more!)
-Chris
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