To avoid a potential hang condition with TLB invalidation we need to enable masked bit 5 of MMIO 0xE5F0 at boot. Same workaround was in place for previous platforms, but the register offset has changed for CNL. But also BSpec doesn't mention the bit 15 as set on gen9 platforms and mark bit as reserved on CNL. v2: Improve commit message accepting Oscar's suggestion. Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> Cc: Oscar Mateo <oscar.mateo@xxxxxxxxx> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> Reviewed-by: Oscar Mateo <oscar.mateo@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20170822232715.3220-1-rodrigo.vivi@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 d9b0249fe5a1..c59c590e45c4 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7024,6 +7024,7 @@ enum { /* GEN8 chicken */ #define HDC_CHICKEN0 _MMIO(0x7300) +#define CNL_HDC_CHICKEN0 _MMIO(0xE5F0) #define HDC_FORCE_CSR_NON_COHERENT_OVR_DISABLE (1<<15) #define HDC_FENCE_DEST_SLM_DISABLE (1<<14) #define HDC_DONOT_FETCH_MEM_WHEN_MASKED (1<<11) diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index d7e1ccf778a2..a6ac9d0a4156 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -1070,6 +1070,10 @@ static int cnl_init_workarounds(struct intel_engine_cs *engine) struct drm_i915_private *dev_priv = engine->i915; int ret; + /* WaForceContextSaveRestoreNonCoherent:cnl */ + WA_SET_BIT_MASKED(CNL_HDC_CHICKEN0, + HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT); + /* WaDisableReplayBufferBankArbitrationOptimization:cnl */ WA_SET_BIT_MASKED(COMMON_SLICE_CHICKEN2, GEN8_SBE_DISABLE_REPLAY_BUF_OPTIMIZATION); -- 2.13.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
