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

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f123c3e..f238b7b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/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)

diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index e9c00b0..b1ab56a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/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)