drm/i915/gtt: Record the scratch pte
Record the scratch PTE encoding upon creation rather than recomputing the bits everytime. This is important for the next patch where we forgo having a valid scratch page with which we may compute the bits and so require keeping the PTE value instead. v2: Fix up scrub_64K to use scratch_pte as well. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Matthew Auld <matthew.auld@intel.com> Reviewed-by: NMatthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181029182721.29568-1-chris@chris-wilson.co.uk
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