[Intel-gfx] [PATCH 16/22] drm/i915/icl: Wa_1405779004

[Oscar Mateo]

Disable MSC clock gating to prevent data corruption.

BSpec: 19257

Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 1 +
 drivers/gpu/drm/i915/intel_pm.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 f2a42a3..18f8c41 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3825,6 +3825,7 @@ enum {
 #define SLICE_UNIT_LEVEL_CLKGATE	_MMIO(0x94d4)
 #define  SARBUNIT_CLKGATE_DIS		(1 << 5)
 #define  RCCUNIT_CLKGATE_DIS		(1 << 7)
+#define  MSCUNIT_CLKGATE_DIS		(1 << 10)
 
 #define SUBSLICE_UNIT_LEVEL_CLKGATE	_MMIO(0x9524)
 #define  GWUNIT_CLKGATE_DIS		(1 << 16)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8f1d028..68f1b60 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8558,6 +8558,12 @@ static void icl_init_clock_gating(struct drm_i915_private *dev_priv)
 	I915_WRITE(GEN11_LSN_UNSLCVC, (I915_READ(GEN11_LSN_UNSLCVC) |
 				       GEN11_LSN_UNSLCVC_GAFS_HALF_SF_MAXALLOC |
 				       GEN11_LSN_UNSLCVC_GAFS_HALF_CL2_MACALLOC));
+
+	/* Wa_1405779004:icl (pre-prod) */
+	if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_B0))
+		I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE,
+			   (I915_READ(SLICE_UNIT_LEVEL_CLKGATE) |
+			    MSCUNIT_CLKGATE_DIS));
 }
 
 static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
-- 
1.9.1