On Wed, Sep 6, 2017 at 3:03 PM, Rodrigo Vivi <[email protected]> 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
>
> v2: Rebased. No change from v1.
>
> Signed-off-by: Rodrigo Vivi <[email protected]>
> Reviewed-by: Oscar Mateo <[email protected]>
merged to dinq. thanks for reviewing it.
> ---
> 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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--
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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