[Intel-gfx] [PATCH v2 1/2] drm/i915/tgl: Implement WA 18011464164

[José Roberto de Souza]

This fix some possible corruptions.

v2:
Renamed SLICE_UNIT_LEVEL_CLOCK_GATING_CTL to
SLICE_UNIT_LEVEL_CLKGATE_CTL_94D8

BSpec: 52755
BSpec: 52890
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 3 +++
 drivers/gpu/drm/i915/intel_pm.c | 8 +++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9d6536afc94b..76bc70d214b6 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4174,6 +4174,9 @@ enum {
 #define INF_UNIT_LEVEL_CLKGATE		_MMIO(0x9560)
 #define   CGPSF_CLKGATE_DIS		(1 << 3)
 
+#define SLICE_UNIT_LEVEL_CLKGATE_CTL_94D8	_MMIO(0x94D8)
+#define   GS_UNIT_CLOCK_GATING_DIS		REG_BIT(24)
+
 /*
  * Display engine regs
  */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2a32d6230795..80293e3e48ad 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7113,7 +7113,7 @@ static void tgl_init_clock_gating(struct drm_i915_private *dev_priv)
 	I915_WRITE(POWERGATE_ENABLE,
 		   I915_READ(POWERGATE_ENABLE) | vd_pg_enable);
 
-	/* Wa_1409825376:tgl (pre-prod)*/
+	/* Wa_1409825376:tgl (pre-prod) */
 	if (IS_TGL_REVID(dev_priv, TGL_REVID_A0, TGL_REVID_A0))
 		I915_WRITE(GEN9_CLKGATE_DIS_3, I915_READ(GEN9_CLKGATE_DIS_3) |
 			   TGL_VRH_GATING_DIS);
@@ -7121,6 +7121,12 @@ static void tgl_init_clock_gating(struct drm_i915_private *dev_priv)
 	/* Wa_14011059788:tgl */
 	intel_uncore_rmw(&dev_priv->uncore, GEN10_DFR_RATIO_EN_AND_CHICKEN,
 			 0, DFR_DISABLE);
+
+	/* Wa_18011464164:tgl */
+	if (IS_TGL_REVID(dev_priv, TGL_REVID_B0, TGL_REVID_B0))
+		intel_uncore_rmw(&dev_priv->uncore,
+				 SLICE_UNIT_LEVEL_CLKGATE_CTL_94D8, 0,
+				 GS_UNIT_CLOCK_GATING_DIS);
 }
 
 static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
-- 
2.27.0