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http://developer.amd.com/wordpress/media/2013/10/ R5xx_Acceleration_v1.5.pdf On page 281 you can see that register ZB:ZB_BW_CNTL is using 19th bit for enabling this feature on r500. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12861>