2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e1a1bb71896a..2b9e66c0c6cf 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5001,6 +5001,7 @@
 #define GEN7_HALF_SLICE_CHICKEN1        0xe100 /* IVB GT1 + VLV */
 #define GEN7_HALF_SLICE_CHICKEN1_GT2    0xf100
 #define   GEN7_MAX_PS_THREAD_DEP                (8<<12)
+#define   GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE   (1<<10)
 #define   GEN7_PSD_SINGLE_PORT_DISPATCH_ENABLE  (1<<3)
 
 #define GEN7_ROW_CHICKEN2               0xe4f4
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ccd1b88bc24a..0a07d7c9cafc 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5300,6 +5300,9 @@ static void gen8_init_clock_gating(struct drm_device *dev)
         I915_WRITE(COMMON_SLICE_CHICKEN2,
                    _MASKED_BIT_ENABLE(GEN8_CSC2_SBE_VUE_CACHE_CONSERVATIVE));
 
+        I915_WRITE(GEN7_HALF_SLICE_CHICKEN1,
+                   _MASKED_BIT_ENABLE(GEN7_SINGLE_SUBSCAN_DISPATCH_ENABLE));
+
         /* WaSwitchSolVfFArbitrationPriority */
         I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);