Wa for B-stepping only.
A for a hang issue that requires throttling EU performace
to 12.5% to avoid back pressure to thread dispatch
v2: Rebased. No change from v1.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Reviewed-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_engine_cs.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 5651081ff789..8f3645cd8370 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8058,6 +8058,7 @@ enum {
#define FLOW_CONTROL_ENABLE (1<<15)
#define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8)
#define STALL_DOP_GATING_DISABLE (1<<5)
+#define THROTTLE_12_5 (7<<2)
#define GEN7_ROW_CHICKEN2 _MMIO(0xe4f4)
#define GEN7_ROW_CHICKEN2_GT2 _MMIO(0xf4f4)
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 23812ec23969..b8e9a234af2d 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1079,6 +1079,10 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine)
WA_SET_BIT_MASKED(CNL_HDC_CHICKEN0,
HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT);
+ /* WaThrottleEUPerfToAvoidTDBackPressure:cnl(pre-prod) */
+ if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0))
+ WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN, THROTTLE_12_5);
+
/* WaDisableReplayBufferBankArbitrationOptimization:cnl */
WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2,
GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION);
--
2.13.2
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