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drm/i915/cnl: WaThrottleEUPerfToAvoidTDBackPressure:cnl(pre-prod) 

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@intel.com>
Reviewed-by: Oscar Mateo <oscar.mateo@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170906220325.24524-1-rodrigo.vivi@intel.com
This commit is contained in:
Rodrigo Vivi 2017-09-06 15:03:25 -07:00
parent 88c880bbde
commit aa9f4c4f19
2 changed files with 5 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -8061,6 +8061,7 @@ 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)

4
drivers/gpu/drm/i915/intel_engine_cs.c
View File

@ -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);