drm/radeon/kms: Schedule host path read cache flush through the ring V2
R300 family will hard lockup if host path read cache flush is
done through MMIO to HOST_PATH_CNTL. But scheduling same flush
through ring seems harmless. This patch remove the hdp_flush
callback and add a flush after each fence emission which means
a flush after each IB schedule. Thus we should have same behavior
without the hard lockup.
Tested on R100,R200,R300,R400,R500,R600,R700 family.
V2: Adjust fence counts in r600_blit_prepare_copy()
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/r600_blit_kms.c b/drivers/gpu/drm/radeon/r600_blit_kms.c
index 9aecafb..8787ea8 100644
--- a/drivers/gpu/drm/radeon/r600_blit_kms.c
+++ b/drivers/gpu/drm/radeon/r600_blit_kms.c
@@ -577,9 +577,9 @@
ring_size = num_loops * dwords_per_loop;
/* set default + shaders */
ring_size += 40; /* shaders + def state */
- ring_size += 5; /* fence emit for VB IB */
+ ring_size += 7; /* fence emit for VB IB */
ring_size += 5; /* done copy */
- ring_size += 5; /* fence emit for done copy */
+ ring_size += 7; /* fence emit for done copy */
r = radeon_ring_lock(rdev, ring_size);
WARN_ON(r);