drm/i915/gen9: Implement WaDisableDgMirrorFixInHalfSliceChicken5

Move WaDisableDgMirrorFixInHalfSliceChicken5 to gen9_init_workarounds

v2: Added stepping check

v3: Removed unused register bitmap

Signed-off-by: Nick Hoath <nicholas.hoath@intel.com>
[danvet: Bikesheds.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index b869f1c68753..248db5157e02 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -882,6 +882,16 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
         WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
                           PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);
 
+        if (INTEL_REVID(dev) == SKL_REVID_A0) {
+                /*
+                * WaDisableDgMirrorFixInHalfSliceChicken5:skl
+                * This is a pre-production w/a.
+                */
+                I915_WRITE(GEN9_HALF_SLICE_CHICKEN5,
+                        I915_READ(GEN9_HALF_SLICE_CHICKEN5) &
+                        ~GEN9_DG_MIRROR_FIX_ENABLE);
+        }
+
         return 0;
 }