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The registers are the same as on Sandybridge. Fixes scrambled display in X when it does software drawing to the GTT, and scans the results out as tiled. Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Keith Packard <keithp@keithp.com>