drm/radeon/cayman: setup hdp to invalidate and flush when asked

On cayman we need to set the bit to cause HDP flushes to invalidate the
HDP cache also.

Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/ni.c b/drivers/gpu/drm/radeon/ni.c
index 7aade20f63a8..57d3d6c208d8 100644
--- a/drivers/gpu/drm/radeon/ni.c
+++ b/drivers/gpu/drm/radeon/ni.c
@@ -931,6 +931,10 @@ static void cayman_gpu_init(struct radeon_device *rdev)
         WREG32(CB_PERF_CTR3_SEL_0, 0);
         WREG32(CB_PERF_CTR3_SEL_1, 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/nid.h b/drivers/gpu/drm/radeon/nid.h
index 0f9a08b53fbd..b2088c1981d8 100644
--- a/drivers/gpu/drm/radeon/nid.h
+++ b/drivers/gpu/drm/radeon/nid.h
@@ -136,6 +136,8 @@
 #define HDP_NONSURFACE_INFO                             0x2C08
 #define HDP_NONSURFACE_SIZE                             0x2C0C
 #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_SYS_RB_BACKEND_DISABLE                  0x3F8C