drm/i915/gen9: Implement WaEnableYV12BugFixInHalfSliceChicken7

Move WaEnableYV12BugFixInHalfSliceChicken7 to gen9_init_workarounds

v2: Add stepping check.

Signed-off-by: Nick Hoath <nicholas.hoath@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index dab4c1ebbc08..4ee1964d2c7b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6216,6 +6216,9 @@ enum skl_disp_power_wells {
 #define   GEN9_DISABLE_OCL_OOB_SUPPRESS_LOGIC   (1<<5)
 #define   GEN8_SAMPLER_POWER_BYPASS_DIS (1<<1)
 
+#define GEN9_HALF_SLICE_CHICKEN7        0xe194
+#define   GEN9_ENABLE_YV12_BUGFIX       (1<<4)
+
 /* Audio */
 #define G4X_AUD_VID_DID                 (dev_priv->info.display_mmio_offset + 0x62020)
 #define   INTEL_AUDIO_DEVCL             0x808629FB
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 909430ffa7fe..2ab447c711bc 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -896,6 +896,12 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
                         ~GEN9_DG_MIRROR_FIX_ENABLE);
         }
 
+        if (INTEL_REVID(dev) >= SKL_REVID_C0) {
+                /* WaEnableYV12BugFixInHalfSliceChicken7:skl */
+                WA_SET_BIT_MASKED(GEN9_HALF_SLICE_CHICKEN7,
+                                  GEN9_ENABLE_YV12_BUGFIX);
+        }
+
         return 0;
 }