2 files changed, 7 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index c20eac3379e6..864e853cc0ec 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1578,7 +1578,7 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
         u32 sq_stack_resource_mgmt_2;
         u32 sq_stack_resource_mgmt_3;
         u32 vgt_cache_invalidation;
-        u32 hdp_host_path_cntl;
+        u32 hdp_host_path_cntl, tmp;
         int i, j, num_shader_engines, ps_thread_count;
 
         switch (rdev->family) {
@@ -2138,6 +2138,10 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
         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);
 
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index 94533849927e..75b57e394f2b 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -64,6 +64,8 @@
 #define GB_BACKEND_MAP                                  0x98FC
 #define DMIF_ADDR_CONFIG                                0xBD4
 #define HDP_ADDR_CONFIG                                 0x2F48
+#define HDP_MISC_CNTL                                   0x2F4C
+#define         HDP_FLUSH_INVALIDATE_CACHE              (1 << 0)
 
 #define CC_SYS_RB_BACKEND_DISABLE                       0x3F88
 #define GC_USER_RB_BACKEND_DISABLE                      0x9B7C