[Intel-gfx] [PATCH 13/13 v2] drm/i915/skl: Prefer even dividers for SKL DPLLs

[Daniel Vetter]

On Fri, Jun 26, 2015 at 02:08:30PM -0300, Paulo Zanoni wrote:
> 2015-06-25 12:19 GMT-03:00 Damien Lespiau <damien.lespiau at intel.com>:
> > Currently, if an odd divider improves the deviation (minimizes it), we
> > take that divider. The recommendation is to prefer even dividers.
> >
> > v2: Move the check at the right place after having inverted the two for
> >     loops in the previous patch.
> >
> > Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
> 
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

Last two patches merged, thanks.
-Daniel

> 
> > ---
> >  drivers/gpu/drm/i915/intel_ddi.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > index 6e964ef..f6b3ccc 100644
> > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > @@ -1317,6 +1317,13 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
> >                                                       p);
> >                         }
> >                 }
> > +
> > +               /*
> > +                * If a solution is found with an even divider, prefer
> > +                * this one.
> > +                */
> > +               if (d == 0 && ctx.p)
> > +                       break;
> >         }
> >
> >         if (!ctx.p) {
> > --
> > 2.1.0
> >
> 
> 
> 
> -- 
> Paulo Zanoni
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> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch