GPU_HDP_FLUSH_REQ 3538 drivers/gpu/drm/radeon/cik.c 	radeon_ring_write(ring, GPU_HDP_FLUSH_REQ >> 2);
GPU_HDP_FLUSH_REQ  184 drivers/gpu/drm/radeon/cik_sdma.c 	radeon_ring_write(ring, GPU_HDP_FLUSH_REQ);