linux-kernel - Re: [PATCH 2/2] drm/panel: simple: Add support for Sharp LD-D5116Z01B panel

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Message-ID: <CAOCk7NrVSCt18QfMs+_nW1rDMuhK_dPKWL0roESmwEEy4u3BZQ@mail.gmail.com>
Date:   Fri, 5 Jul 2019 12:35:30 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     thierry.reding@...il.com, Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        DTML <devicetree@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] drm/panel: simple: Add support for Sharp LD-D5116Z01B panel

On Fri, Jul 5, 2019 at 11:21 AM Sam Ravnborg <sam@...nborg.org> wrote:
>
> Hi Jeffrey.
>
> Patch looks good, but there is a few fields that are not initialized.
> Did you forget them, or are they not needed?

Thanks for the review.  Overlooked some of them.

>
> On Fri, Jul 05, 2019 at 09:57:55AM -0700, Jeffrey Hugo wrote:
> > The Sharp LD-D5116Z01B is a 12.3" eDP panel with a 1920X1280 resolution.
> >
> > Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> > ---
> >  drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index 5a93c4edf1e4..e6f578667324 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -2354,6 +2354,29 @@ static const struct panel_desc samsung_ltn140at29_301 = {
> >       },
> >  };
> >
> > +static const struct drm_display_mode sharp_ld_d5116z01b_mode = {
> > +     .clock = 168480,
> > +     .hdisplay = 1920,
> > +     .hsync_start = 1920 + 48,
> > +     .hsync_end = 1920 + 48 + 32,
> > +     .htotal = 1920 + 48 + 32 + 80,
> > +     .vdisplay = 1280,
> > +     .vsync_start = 1280 + 3,
> > +     .vsync_end = 1280 + 3 + 10,
> > +     .vtotal = 1280 + 3 + 10 + 57,
> > +     .vrefresh = 60,
> > +};
> No .flags? Is it not needed for an eDP panel?

The flags don't appear to make sense per my understanding of eDP.
Therefore I intended .flags to be 0, which it implicitly is because
this is a static struct.  Would you prefer I explicitly list .flags =
0?

>
> > +
> > +static const struct panel_desc sharp_ld_d5116z01b = {
> > +     .modes = &sharp_ld_d5116z01b_mode,
> > +     .num_modes = 1,
> > +     .bpc = 8,
> > +     .size = {
> > +             .width = 260,
> > +             .height = 120,
> > +     },
> > +};
> No .bus_format?

Ah, yes.  Looks like it should be MEDIA_BUS_FMT_RGB888_1X24
Will fix.

> No .bus_flags?

eDP is differential signaling, so what I see generally doesn't apply,
but DRM_BUS_FLAG_DATA_MSB_TO_LSB does apply, so I'll add that.