On Fri, Mar 01, 2013 at 01:14:10PM -0800, Jesse Barnes wrote: > References: https://bugs.freedesktop.org/show_bug.cgi?id=50250 > Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org> > --- > drivers/gpu/drm/i915/i915_reg.h | 3 +++ > drivers/gpu/drm/i915/intel_pm.c | 4 ++++ > 2 files changed, 7 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 766518b..09b9072 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -3583,6 +3583,9 @@ > #define GEN7_L3SQCREG4 0xb034 > #define L3SQ_URB_READ_CAM_MATCH_DISABLE (1<<27) > > +#define GEN7_L3SQCREG4 0xb034 > +#define L3SQ_URB_READ_CAM_MATCH_DISABLE (1<<27) > + > /* WaCatErrorRejectionIssue */ > #define GEN7_SQ_CHICKEN_MBCUNIT_CONFIG 0x9030 > #define GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB (1<<11) > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index 61fee7f..0f1adc8 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -3830,6 +3830,10 @@ static void ivybridge_init_clock_gating(struct > drm_device *dev) > I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) & > ~L3SQ_URB_READ_CAM_MATCH_DISABLE); > > + /* WaForceL3Serialization */ > + I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) & > + ~L3SQ_URB_READ_CAM_MATCH_DISABLE);
I suspect doing it twice won't serialize things any further ;) Actually it seems we're already clearing the bit twice. So this is the third one you're adding. > + > /* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock > * gating disable must be set. Failure to set it results in > * flickering pixels due to Z write ordering failures after > -- > 1.7.9.5 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Ville Syrjälä Intel OTC _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
