Hi 2012/10/17 Daniel Vetter <daniel.vetter at ffwll.ch>: > Found while strolling for ilk workarounds since this one is listed > there, too. I think that's a mistake though, since the w/a isn't > listed for snb/ivb, and the relevant register doesn't seem to exist on > ilk. > > Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch> Tested-by: Paulo Zanoni <paulo.r.zanoni at intel.com> This needs a comment saying that it's just for pre-production hardware, needs to be removed later. With that: Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com> > --- > drivers/gpu/drm/i915/i915_reg.h | 1 + > drivers/gpu/drm/i915/intel_pm.c | 7 +++++-- > 2 files changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h > index a4162dd..555a90f 100644 > --- a/drivers/gpu/drm/i915/i915_reg.h > +++ b/drivers/gpu/drm/i915/i915_reg.h > @@ -4126,6 +4126,7 @@ > # define GEN6_CSUNIT_CLOCK_GATE_DISABLE (1 << 7) > > #define GEN6_UCGCTL2 0x9404 > +# define GEN7_VFUNIT_CLOCK_GATE_DISABLE (1<<31) > # define GEN7_VDSUNIT_CLOCK_GATE_DISABLE (1 << 30) > # define GEN7_TDLUNIT_CLOCK_GATE_DISABLE (1 << 22) > # define GEN6_RCZUNIT_CLOCK_GATE_DISABLE (1 << 13) > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > index 72f41aa..48bbcc1 100644 > --- a/drivers/gpu/drm/i915/intel_pm.c > +++ b/drivers/gpu/drm/i915/intel_pm.c > @@ -3507,8 +3507,11 @@ static void haswell_init_clock_gating(struct drm_device *dev) > > /* According to the spec, bit 13 (RCZUNIT) must be set on IVB. > * This implements the WaDisableRCZUnitClockGating workaround. > - */ > - I915_WRITE(GEN6_UCGCTL2, GEN6_RCZUNIT_CLOCK_GATE_DISABLE); > + * New w/a on hsw: bit 31 must be set, too. This implements for > + * WaDisableVFUnitClockGating */ > + I915_WRITE(GEN6_UCGCTL2, > + GEN6_RCZUNIT_CLOCK_GATE_DISABLE | > + GEN7_VFUNIT_CLOCK_GATE_DISABLE); > > I915_WRITE(ILK_DSPCLK_GATE, IVB_VRHUNIT_CLK_GATE); > > -- > 1.7.10.4 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Paulo Zanoni
