[Intel-gfx] [PATCH v2 2/2] drm/i915/tgl: Add Wa_1408615072

[Radhakrishna Sripada]

Disable VS Unit Clockgating.

v2: Fix VSUNIT instead of VFUNIT(Ville)

BSpec: 52857
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 1 +
 drivers/gpu/drm/i915/intel_pm.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 478f5ff6c554..8fb3d2082806 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4178,6 +4178,7 @@ enum {
 
 #define UNSLICE_UNIT_LEVEL_CLKGATE	_MMIO(0x9434)
 #define  VFUNIT_CLKGATE_DIS		(1 << 20)
+#define  VSUNIT_CLKGATE_DIS		(1 << 3)
 
 #define INF_UNIT_LEVEL_CLKGATE		_MMIO(0x9560)
 #define   CGPSF_CLKGATE_DIS		(1 << 3)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 05ba9e1bd247..3aaad4957675 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6580,6 +6580,10 @@ static void tgl_init_clock_gating(struct drm_i915_private *dev_priv)
 
 	I915_WRITE(POWERGATE_ENABLE,
 		   I915_READ(POWERGATE_ENABLE) | vd_pg_enable);
+
+	/* Wa_1408615072:tgl */
+	I915_WRITE(UNSLICE_UNIT_LEVEL_CLKGATE,
+		   I915_READ(UNSLICE_UNIT_LEVEL_CLKGATE) | VSUNIT_CLKGATE_DIS);
 }
 
 static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
-- 
2.20.1