[Intel-gfx] [PATCH v3 3/3] drm/i915/bxt: Add WaDisablePooledEuLoadBalancingFix

[Arun Siluvery]

This is a WA affecting pooled eu which is a bxt specific feature.

Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
Cc: Winiarski, Michal <michal.winiarski at intel.com>
Cc: Zou, Nanhai <nanhai.zou at intel.com>
Cc: Yang, Rong R <rong.r.yang at intel.com>
Cc: Jeff McGee <jeff.mcgee at intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h         | 1 +
 drivers/gpu/drm/i915/intel_ringbuffer.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1d97321e..5268aed 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6072,6 +6072,7 @@ enum skl_disp_power_wells {
 
 #define FF_SLICE_CS_CHICKEN2			_MMIO(0x20e4)
 #define  GEN9_TSG_BARRIER_ACK_DISABLE		(1<<8)
+#define  GEN9_POOLED_EU_LOAD_BALANCING_FIX_DISABLE  (1<<10)
 
 #define GEN9_CS_DEBUG_MODE1		_MMIO(0x20ec)
 #define GEN8_CS_CHICKEN1		_MMIO(0x2580)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8d35a39..a21eced 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1145,6 +1145,12 @@ static int bxt_init_workarounds(struct intel_engine_cs *engine)
 	WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
 			  STALL_DOP_GATING_DISABLE);
 
+	/* WaDisablePooledEuLoadBalancingFix:bxt */
+	if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) {
+		WA_SET_BIT_MASKED(FF_SLICE_CS_CHICKEN2,
+				  GEN9_POOLED_EU_LOAD_BALANCING_FIX_DISABLE);
+	}
+
 	/* WaDisableSbeCacheDispatchPortSharing:bxt */
 	if (IS_BXT_REVID(dev_priv, 0, BXT_REVID_B0)) {
 		WA_SET_BIT_MASKED(
-- 
1.9.1