Hi,
On Mon, 2019-12-16 at 11:30 +0100, Enric Balletbo Serra wrote:
> Hi all,
>
> Missatge de Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> del dia dl., 16 de des.
> 2019 a les 3:42:
> >
> > On Fri, Dec 13, 2019 at 9:52 AM Jitao Shi <jitao.shi@xxxxxxxxxxxx> wrote:
> > >
> > > There are some extra data transfer in dsi.
> > > ex. LPX, hs_prepare, hs_zero, hs_exit and the sof/eof of dsi packet.
> > > This signal will enlarge the line time. So the real frame on dsi bus
> > > will be lower than calc by video timing.
> > >
> > > So dsi driver reduces the hbp and hfp to keep the line time.
> > >
>
> This patch not only reduces the hbp and hfp for phy timing, it also
> fixes an actual issue for MT8173 boards (i.e. Acer Chromebook R 13)
> which is that the display is not working anymore (black screen) after
> 7a5bc4e22ecfd74dc3662342beaa909770a3b786 "drm/mediatek: change the dsi
> phytiming calculate method". So the patch is probably missing a:
>
> Fixes: 7a5bc4e22ecf ("drm/mediatek: change the dsi phytiming calculate method")
>
> And would be nice to have this patch applied for 5.5
>
> > > Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
> > Tested-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
>
> If it helps, you can also add my
>
> Tested-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
>
> Thanks,
> Enric
Applied to mediatek-drm-fixes-5.5 [1], thank you all.
[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-fixes-5.5
Regards,
CK
>
> > > ---
> >
> > Tested on mt8183 and mt8173
> >
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek
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