[PATCH] drm/radeon: revert "Prefer lower feedback dividers"

[Alex Deucher]

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

On Fri, Sep 11, 2020 at 3:35 AM Christian König
<ckoenig.leichtzumerken at gmail.com> wrote:
>
> Ping, we need to revert this ASAP.
>
> Christian.
>
> Am 09.09.20 um 13:16 schrieb Christian König:
> > Turns out this breaks a lot of different hardware.
> >
> > This reverts commit 522ff3a8b6d73a31084b4b087b458f7fa0ac1e14.
> >
> > Signed-off-by: Christian König <christian.koenig at amd.com>
> > ---
> >   drivers/gpu/drm/radeon/radeon_display.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
> > index 7b69d6dfe44a..e0ae911ef427 100644
> > --- a/drivers/gpu/drm/radeon/radeon_display.c
> > +++ b/drivers/gpu/drm/radeon/radeon_display.c
> > @@ -933,7 +933,7 @@ static void avivo_get_fb_ref_div(unsigned nom, unsigned den, unsigned post_div,
> >
> >       /* get matching reference and feedback divider */
> >       *ref_div = min(max(den/post_div, 1u), ref_div_max);
> > -     *fb_div = max(nom * *ref_div * post_div / den, 1u);
> > +     *fb_div = DIV_ROUND_CLOSEST(nom * *ref_div * post_div, den);
> >
> >       /* limit fb divider to its maximum */
> >       if (*fb_div > fb_div_max) {
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx