[Intel-gfx] [PATCH 5/6] drm/i915/gen9: WA ST Unit Power Optimization Disable

[Arun Siluvery]

From: Robert Beckett <robert.beckett at intel.com>

WaDisableSTUnitPowerOptimization:skl,bxt

Signed-off-by: Robert Beckett <robert.beckett at intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h         | 3 +++
 drivers/gpu/drm/i915/intel_ringbuffer.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2c719b0..9b47dd4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6940,6 +6940,9 @@ enum skl_disp_power_wells {
 #define HSW_ROW_CHICKEN3		0xe49c
 #define  HSW_ROW_CHICKEN3_L3_GLOBAL_ATOMICS_DISABLE    (1 << 6)
 
+#define HALF_SLICE_CHICKEN2		0xe180
+#define   GEN8_ST_PO_DISABLE		(1<<13)
+
 #define HALF_SLICE_CHICKEN3		0xe184
 #define   HSW_SAMPLE_C_PERFORMANCE	(1<<9)
 #define   GEN8_CENTROID_PIXEL_OPT_DIS	(1<<8)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 0e1ed0b..028c099 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;
 }
 
-- 
1.9.1