2 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f5701ff8847d..b87945d5dceb 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -660,6 +660,7 @@
 #define   ARB_MODE_SWIZZLE_SNB  (1<<4)
 #define   ARB_MODE_SWIZZLE_IVB  (1<<5)
 #define GAMTARBMODE             0x04a08
+#define   ARB_MODE_BWGTLB_DISABLE (1<<9)
 #define   ARB_MODE_SWIZZLE_BDW  (1<<1)
 #define RENDER_HWS_PGA_GEN7     (0x04080)
 #define RING_FAULT_REG(ring)    (0x4094 + 0x100*(ring)->id)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 6d186757dc33..8249be5f83fc 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5286,6 +5286,8 @@ static void gen8_init_clock_gating(struct drm_device *dev)
         /* FIXME(BDW): Check all the w/a, some might only apply to
          * pre-production hw. */
 
+        I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_BWGTLB_DISABLE));
+
         /* WaSwitchSolVfFArbitrationPriority */
         I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) | HSW_ECOCHK_ARB_PRIO_SOL);