Disable MSC clock gating to prevent data corruption.
BSpec: 19257
v2: Rebased on top of the WA refactoring
v3: Added References (Mika)
v4:
- Rebased
- C, not lisp (Chris)
- A0 only (Mika)
References: HSDES#1405779004
Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_workarounds.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 dd23af3..950ec8e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3840,6 +3840,7 @@ 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_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 3547403..469a83d 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -739,6 +739,12 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
*/
I915_WRITE(GAMW_ECO_DEV_RW_IA_REG, I915_READ(GAMW_ECO_DEV_RW_IA_REG) |
GAMW_ECO_DEV_CTX_RELOAD_DISABLE);
+
+ /* Wa_1405779004:icl (pre-prod) */
+ if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_A0))
+ I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE,
+ I915_READ(SLICE_UNIT_LEVEL_CLKGATE) |
+ MSCUNIT_CLKGATE_DIS);
}
void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)
--
1.9.1
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