On Tue, Apr 9, 2013 at 5:37 AM, Ville Syrj?l? <ville.syrjala at linux.intel.com
> wrote:
> On Mon, Apr 08, 2013 at 06:49:44PM -0300, Rodrigo Vivi wrote:
> > Display register 46500h bit 23 must be set to 1b for the entire time that
> > Frame Buffer Compression is enabled.
>
> So should we enable it again after FBC is disabled to avoid wasting
> power?
>
I didn't take the opposite direction because it wasn't explicit.
I tested to enabled it again after FBC is disabled but I didn't see any
difference.
So, you suggestion is to enable back anyway?
>
> >
> > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
> > ---
> > drivers/gpu/drm/i915/i915_reg.h | 3 +++
> > drivers/gpu/drm/i915/intel_pm.c | 2 ++
> > 2 files changed, 5 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h
> > index 2340bc2..2ef0292 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -863,6 +863,9 @@
> > _HSW_PIPE_SLICE_CHICKEN_1_A,
> + \
> > _HSW_PIPE_SLICE_CHICKEN_1_B)
> >
> > +#define HSW_CLKGATE_DISABLE_PART_1 0x46500
> > +#define HSW_DPFC_GATING_DISABLE (1<<23)
> > +
> > /*
> > * GPIO regs
> > */
> > diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> > index 0628a84..f2ce541 100644
> > --- a/drivers/gpu/drm/i915/intel_pm.c
> > +++ b/drivers/gpu/drm/i915/intel_pm.c
> > @@ -281,6 +281,8 @@ static void haswell_enable_fbc(struct drm_crtc
> *crtc, unsigned long interval)
> > /* WaFbcAsynchFlipDisableFbcQueue */
> > I915_WRITE(HSW_PIPE_SLICE_CHICKEN_1(intel_crtc->pipe),
> > HSW_BYPASS_FBC_QUEUE);
> > + /* WaFbcDisableDpfcClockGating */
> > + I915_WRITE(HSW_CLKGATE_DISABLE_PART_1, HSW_DPFC_GATING_DISABLE);
> >
> > if (obj->fence_reg != I915_FENCE_REG_NONE) {
> > I915_WRITE(SNB_DPFC_CTL_SA,
> > --
> > 1.8.1.4
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Ville Syrj?l?
> Intel OTC
>
--
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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