Rodrigo Vivi <[email protected]> writes: > On CNL B0 stepping GAM is not able to detect some deadlock > condition and then rise the rise the gam_coh_flush. > > WA database and spec both mentions to set 4AB8[24]=1 as > workaround. Alghouth register offset 0x4AB8 is not s/Alghouth/Although
> documented for any platform. > References: HSD#1945815, BSID#1112 > Cc: Mika Kuoppala <[email protected]> > Signed-off-by: Rodrigo Vivi <[email protected]> Reviewed-by: Mika Kuoppala <[email protected]> > --- > drivers/gpu/drm/i915/i915_reg.h | 1 + > drivers/gpu/drm/i915/intel_engine_cs.c | 5 +++++ > 2 files changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index e2908ae34004..bbacdac5c794 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -2373,6 +2373,7 @@ enum i915_power_well_id { > > #define GAMT_CHKN_BIT_REG _MMIO(0x4ab8) > #define GAMT_CHKN_DISABLE_DYNAMIC_CREDIT_SHARING (1<<28) > +#define GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT (1<<24) > > #if 0 > #define PRB0_TAIL _MMIO(0x2030) > diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c > b/drivers/gpu/drm/i915/intel_engine_cs.c > index a6ac9d0a4156..f087eb6b0134 100644 > --- a/drivers/gpu/drm/i915/intel_engine_cs.c > +++ b/drivers/gpu/drm/i915/intel_engine_cs.c > @@ -1070,6 +1070,11 @@ static int cnl_init_workarounds(struct intel_engine_cs > *engine) > struct drm_i915_private *dev_priv = engine->i915; > int ret; > > + /* WaDisableI2mCycleOnWRPort: cnl (pre-prod) */ > + if (IS_CNL_REVID(dev_priv, CNL_REVID_B0, CNL_REVID_B0)) > + WA_SET_BIT(GAMT_CHKN_BIT_REG, > + GAMT_CHKN_DISABLE_I2M_CYCLE_ON_WR_PORT); > + > /* WaForceContextSaveRestoreNonCoherent:cnl */ > WA_SET_BIT_MASKED(CNL_HDC_CHICKEN0, > HDC_FORCE_CONTEXT_SAVE_RESTORE_NON_COHERENT); > -- > 2.13.2 > > _______________________________________________ > Intel-gfx mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
