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intel: Fall back to X-tiling when larger than estimated aperture size.
If a region is larger than the estimated aperture size, we map/unmap it
by copying with the BLT engine. Which means we can't use Y-tiling.
Fixes Piglit max-texture-size and tex3d-maxsize, which regressed in my
recent change to use Y-tiling by default on Gen6+. This was due to a
botched merge conflict resolution.
v2: Return a mask of valid tilings from intel_miptree_select_tiling.
This allows us to avoid the X-tiling fallback if Y-tiling is actually
mandatory.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>