diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 469a83d521ae7f507bd06ad63165bd81510d2158..a3fa01a47c86561afa188d5f7d986cc4456db312 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -745,6 +745,11 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
 		I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE,
 			   I915_READ(SLICE_UNIT_LEVEL_CLKGATE) |
 			   MSCUNIT_CLKGATE_DIS);
+
+	/* Wa_1406680159:icl */
+	I915_WRITE(SUBSLICE_UNIT_LEVEL_CLKGATE,
+		   I915_READ(SUBSLICE_UNIT_LEVEL_CLKGATE) |
+		   GWUNIT_CLKGATE_DIS);
 }
 
 void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)