drm/i915/icl: Wa_1406463099

Prevents an error in the GAM unit. Also known as WaGamTlbPendError

References: HSDES#1406463099
References: HSDES#1406465643
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1527285939-20113-12-git-send-email-oscar.mateo@intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -2306,8 +2306,9 @@ enum i915_power_well_id {
 #define   GAMW_ECO_ENABLE_64K_IPS_FIELD 0xF
 
 #define GAMT_CHKN_BIT_REG	_MMIO(0x4ab8)
-#define   GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING	(1<<28)
-#define   GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT	(1<<24)
+#define   GAMT_CHKN_DISABLE_L3_COH_PIPE			(1 << 31)
+#define   GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING	(1 << 28)
+#define   GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT	(1 << 24)
 
 #if 0
 #define PRB0_TAIL	_MMIO(0x2030)

drivers/gpu/drm/i915/intel_workarounds.c

@@ -859,6 +859,13 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
 		   PMFLUSHDONE_LNICRSDROP |
 		   PMFLUSH_GAPL3UNBLOCK |
 		   PMFLUSHDONE_LNEBLK);
+
+	/* Wa_1406463099:icl
+	 * Formerly known as WaGamTlbPendError
+	 */
+	I915_WRITE(GAMT_CHKN_BIT_REG,
+		   I915_READ(GAMT_CHKN_BIT_REG) |
+		   GAMT_CHKN_DISABLE_L3_COH_PIPE);
 }
 
 void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)