From 6b6d5626750d72a22180a6e094cf95acd1d85c9b Mon Sep 17 00:00:00 2001
From: Robert Beckett <robert.beckett@intel.com>
Date: Tue, 8 Sep 2015 10:31:52 +0100
Subject: drm/i915/gen9: WA ST Unit Power Optimization Disable

WaDisableSTUnitPowerOptimization:skl,bxt

Signed-off-by: Robert Beckett <robert.beckett@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 684e0693dae9..16a4eada60a1 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -990,6 +990,9 @@ static int gen9_init_workarounds(struct intel_engine_cs *ring)
 				  GEN8_SAMPLER_POWER_BYPASS_DIS);
 	}
 
+	/* WaDisableSTUnitPowerOptimization:skl,bxt */
+	WA_SET_BIT_MASKED(HALF_SLICE_CHICKEN2, GEN8_ST_PO_DISABLE);
+
 	return 0;
 }
 
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