drm/radeon/kms/cayman/blit: specify CP_COHER_CNTL2 with surface_sync
CP_COHER_CNTL2 has to be programmed manually when submitting packets to the ring directly rather than programmed via an IB. Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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