"Clock gating bug in GWL may not clear barrier state when an EOT
is received, causing a hang the next time that barrier is used."
HSDES: 2201832410
Cc: Rafael Antognolli <rafael.antognolli@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +++
drivers/gpu/drm/i915/intel_pm.c | 5 +++++
2 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a060726fed7e..42baf90edb6f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3953,6 +3953,9 @@ enum {
#define SARBUNIT_CLKGATE_DIS (1 << 5)
#define RCCUNIT_CLKGATE_DIS (1 << 7)
+#define SUBSLICE_UNIT_LEVEL_CLKGATE _MMIO(0x9524)
+#define GWUNIT_CLKGATE_DIS (1 << 16)
+
#define UNSLICE_UNIT_LEVEL_CLKGATE _MMIO(0x9434)
#define VFUNIT_CLKGATE_DIS (1 << 20)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3e60279f18b1..be01012bb65f 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8522,6 +8522,11 @@ static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
val |= SARBUNIT_CLKGATE_DIS;
I915_WRITE(SLICE_UNIT_LEVEL_CLKGATE, val);
+ /* Wa_2201832410:cnl */
+ val = I915_READ(SUBSLICE_UNIT_LEVEL_CLKGATE);
+ val |= GWUNIT_CLKGATE_DIS;
+ I915_WRITE(SUBSLICE_UNIT_LEVEL_CLKGATE, val);
+
/* WaDisableVFclkgate:cnl */
val = I915_READ(UNSLICE_UNIT_LEVEL_CLKGATE);
val |= VFUNIT_CLKGATE_DIS;
--
2.13.6
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