On 04/06/2017 12:16 PM, Rodrigo Vivi wrote:
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 Signed-off-by: Rodrigo Vivi <[email protected]> --- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_engine_cs.c | 4 ++++ 2 files changed, 5 insertions(+)
Reviewed-by: Oscar Mateo <[email protected]>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 67f306e..8b25119 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7839,6 +7839,7 @@ 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 b5599fa..754b370 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -951,6 +951,10 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine) struct drm_i915_private *dev_priv = engine->i915; int ret;+ /* 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);
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