From: Damien Lespiau <damien.lespiau@intel.com>
Date: Mon, 9 Feb 2015 19:33:20 +0000 (+0000)
Subject: drm/i915/skl: Implement WaDisableChickenBitTSGBarrierAckForFFSliceCS
X-Git-Tag: firefly_0821_release~176^2~1915^2~35^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2caa3b260aa6a3d015352c07d1bce1461825fa6c;p=firefly-linux-kernel-4.4.55.git

drm/i915/skl: Implement WaDisableChickenBitTSGBarrierAckForFFSliceCS

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 75227009d0bb..ecc14f558744 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5236,6 +5236,9 @@ enum skl_disp_power_wells {
 #define HSW_NDE_RSTWRN_OPT	0x46408
 #define  RESET_PCH_HANDSHAKE_ENABLE	(1<<4)
 
+#define FF_SLICE_CS_CHICKEN2			0x02e4
+#define  GEN9_TSG_BARRIER_ACK_DISABLE		(1<<8)
+
 /* GEN7 chicken */
 #define GEN7_COMMON_SLICE_CHICKEN1		0x7010
 # define GEN7_CSC1_RHWO_OPT_DISABLE_IN_RCC	((1<<10) | (1<<26))
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a2b9c3e213f9..325f640c16c4 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -66,11 +66,16 @@ static void skl_init_clock_gating(struct drm_device *dev)
 			   GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
 	}
 
-	if (INTEL_REVID(dev) <= SKL_REVID_D0)
+	if (INTEL_REVID(dev) <= SKL_REVID_D0) {
 		/* WaDisableHDCInvalidation:skl */
 		I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
 			   BDW_DISABLE_HDC_INVALIDATION);
 
+		/* WaDisableChickenBitTSGBarrierAckForFFSliceCS:skl */
+		I915_WRITE(FF_SLICE_CS_CHICKEN2,
+			   I915_READ(FF_SLICE_CS_CHICKEN2) |
+			   GEN9_TSG_BARRIER_ACK_DISABLE);
+	}
 
 	if (INTEL_REVID(dev) <= SKL_REVID_E0)
 		/* WaDisableLSQCROPERFforOCL:skl */