[Intel-gfx] [PATCH 2/6] drm/i915/gtt: Don't restore the non-existent PDE for GGTT

[Joonas Lahtinen]

On Fri, 2018-06-01 at 10:35 +0100, Chris Wilson wrote:
> On resume, we have to rewrite all the PDE entries for gen7 ppgtts. If we
> switch on full-ppgtt, there is then one address space with no PDE, the
> GGTT. Currently under aliasing-ppgtt, the GGTT address space does have
> an associated ppgtt and so the restore works just fine. We would have a
> similar problem if we tried disabling aliasing-ppgtt
> (i915.enable_ppgtt=0). So skip the empty ppgtt, as being non-existent it
> doesn't need restoring.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation