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drm/i915: Add fb format modifier support
Currently we don't support anything but X tiled. And for an easier transition it makes a lot of sense to just keep requiring that X tiled is properly fenced. Which means we need to do absolutely nothing in old code to support fb modifiers, yay! v2: Fix the Y tiling check, noticed by Tvrtko. v3: Catch Y-tiled fb for legacy addfb again (Tvrtko) and explain why we want X tiling to match in the comment. Cc: Tvrtko Ursulin <[email protected]> Reviewed-by: Tvrtko Ursulin <[email protected]> Signed-off-by: Daniel Vetter <[email protected]>
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