On CNL B0 stepping GAM is not able to detect some deadlock
condition and then rise the rise the gam_coh_flush.
WA database and spec both mentions to set 4AB8[24]=1 as
workaround. Alghouth register offset 0x4AB8 is not
documented for any platform.
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_engine_cs.c | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e2908ae34004..bbacdac5c794 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2373,6 +2373,7 @@ enum i915_power_well_id {
#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)
#if 0
#define PRB0_TAIL _MMIO(0x2030)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index a6ac9d0a4156..f087eb6b0134 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1070,6 +1070,11 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine)
struct drm_i915_private *dev_priv = engine->i915;
int ret;
+ /* WaDisableI2mCycleOnWRPort: cnl (pre-prod) */
+ if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0))
+ WA_SET_BIT(GAMT_CHKN_BIT_REG,
+ GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT);
+
/* WaForceContextSaveRestoreNonCoherent:cnl */
WA_SET_BIT_MASKED(CNL_HDC_CHICKEN0,
HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT);
--
2.13.2
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