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According to BSpec, trickle feed should be disabled for BW and mobile CL. Those constraints seem to match all of our gen4 chipsets. Trickle feed is disabled via the MI_ARB_STATE register instead of per plane controls on gen4. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>