On Tue, 2 Oct 2012 17:43:38 -0500 Jesse Barnes <jbarnes at virtuousgeek.org> wrote: > References: https://bugs.freedesktop.org/show_bug.cgi?id=50250 > Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org> Reviewed-by: Ben Widawsky <ben at bwidawsk.net> > --- > drivers/gpu/drm/i915/i915_reg.h | 3 +++ > drivers/gpu/drm/i915/intel_pm.c | 8 ++++++++ > 2 files changed, 11 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index 3b75052..c75539b 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -3448,6 +3448,9 @@ > #define GEN7_WA_L3_CHICKEN_MODE 0x20000000 > #define GEN7_WA_DOP_CLOCK_GATING_DISABLE 0x08000000 > > +#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 6be5910..0659317 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -3549,6 +3549,10 @@ static void ivybridge_init_clock_gating(struct drm_device *dev) > I915_WRITE(GEN7_ROW_CHICKEN2, > _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE)); > > + /* WaForceL3Serialization */ > + I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) & > + ~L3SQ_URB_READ_CAM_MATCH_DISABLE); > + > /* 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 > @@ -3623,6 +3627,10 @@ static void valleyview_init_clock_gating(struct drm_device *dev) > I915_WRITE(GEN7_ROW_CHICKEN2, > _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE)); > > + /* WaForceL3Serialization */ > + I915_WRITE(GEN7_L3SQCREG4, I915_READ(GEN7_L3SQCREG4) & > + ~L3SQ_URB_READ_CAM_MATCH_DISABLE); > + > /* This is required by WaCatErrorRejectionIssue */ > I915_WRITE(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG, > I915_READ(GEN7_SQ_CHICKEN_MBCUNIT_CONFIG) | -- Ben Widawsky, Intel Open Source Technology Center
