--- zzzz-none-000/linux-2.6.39.4/drivers/gpu/drm/radeon/evergreen.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/gpu/drm/radeon/evergreen.c	2021-11-10 13:38:14.000000000 +0000
@@ -1601,7 +1601,7 @@
 	u32 sq_stack_resource_mgmt_2;
 	u32 sq_stack_resource_mgmt_3;
 	u32 vgt_cache_invalidation;
-	u32 hdp_host_path_cntl, tmp;
+	u32 hdp_host_path_cntl;
 	int i, j, num_shader_engines, ps_thread_count;
 
 	switch (rdev->family) {
@@ -2164,10 +2164,6 @@
 	for (i = SQ_ALU_CONST_BUFFER_SIZE_HS_0; i < 0x29000; i += 4)
 		WREG32(i, 0);
 
-	tmp = RREG32(HDP_MISC_CNTL);
-	tmp |= HDP_FLUSH_INVALIDATE_CACHE;
-	WREG32(HDP_MISC_CNTL, tmp);
-
 	hdp_host_path_cntl = RREG32(HDP_HOST_PATH_CNTL);
 	WREG32(HDP_HOST_PATH_CNTL, hdp_host_path_cntl);