[v4,PATCH 1/3] drm/mediatek: dpi dual edge sample mode support

[Chun-Kuang Hu]

Rex-BC Chen <rex-bc.chen at mediatek.com> 於 2021年5月26日 週三 上午9:51寫道：
>
> Hello CK,
>
> Thanks for your review.
>
> On Wed, 2021-05-26 at 08:01 +0800, Chun-Kuang Hu wrote:
> > Hi, Rex:
> >
> > Rex-BC Chen <rex-bc.chen at mediatek.com> 於 2021年5月25日 週二 下午8:15寫道：
> > >
> > > DPI can sample on falling, rising or both edge.
> > > When DPI sample the data both rising and falling edge.
> > > It can reduce half data io pins.
> > > Use num_output_fmts to determine whether it is dual edge mode.
> > >
> > > Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
> > > Signed-off-by: Rex-BC Chen <rex-bc.chen at mediatek.com>
> > > ---
> > >  drivers/gpu/drm/mediatek/mtk_dpi.c | 17 ++++++++++++++++-
> > >  1 file changed, 16 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > > b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > > index bea91c81626e..d3b883c97aaf 100644
> > > --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> > > +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> > > @@ -83,6 +83,7 @@ struct mtk_dpi {
> > >         struct pinctrl *pinctrl;
> > >         struct pinctrl_state *pins_gpio;
> > >         struct pinctrl_state *pins_dpi;
> > > +       bool ddr_edge_sel;
> >
> > I would like to keep output_fmt instead of ddr_edge_sel.
> > Initialize output_fmt to MEDIA_BUS_FMT_RGB888_1X24 in this patch.
> >
> It means that I may initialize output_fmt in probe and set value in
> mtk_dpi_bridge_atomic_check() of patch[3/3]?

Yes.

> > >         int refcount;
> > >  };
> > >