linux-kernel - Re: [PATCH 5/6] drm/panel: simple: Innolux TV123WAM is actually P120ZDG-BF1

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Message-ID: <CAD=FV=XjxwmntWs7WRR=8fksdy72=4whVFqWnB4+vn1rp-LZXQ@mail.gmail.com>
Date:   Thu, 25 Oct 2018 15:24:58 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     sean@...rly.run
Cc:     Sean Paul <seanpaul@...omium.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Sandeep Panda <spanda@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        ryandcase@...omium.org, David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 5/6] drm/panel: simple: Innolux TV123WAM is actually P120ZDG-BF1

Hi,

On Thu, Oct 25, 2018 at 11:13 AM Sean Paul <sean@...rly.run> wrote:
>
> On Mon, Oct 22, 2018 at 01:46:38PM -0700, Douglas Anderson wrote:
> > As far as I can tell the panel that was added in commit da50bd4258db
> > ("drm/panel: simple: Add Innolux TV123WAM panel driver support")
> > wasn't actually an Innolux TV123WAM but was actually an Innolux
> > P120ZDG-BF1.
> >
> > As far as I can tell the Innolux TV123WAM isn't a real panel and but
> > it's a mosh between the TI TV123WAM and the Innolux P120ZDG-BF1.
> > Let's unmosh.
> >
> > Here's my evidence:
> >
> > * Searching for TV123WAM on the Internet turns up a TI panel.  While
> >   it's possible that an Innolux panel has the same model number as the
> >   TI Panel, it seems a little doubtful.  Looking up the datasheet from
> >   the TI Panel shows that it's 1920 x 1280 and 259.2 mm x 172.8 mm.
> >
> > * As far as I know, the patch adding the Innolux Panel was supposed to
> >   be for the board that's sitting in front of me as I type this
> >   (support for that board is not yet upstream).  On the back of that
> >   panel I see Innolux P120ZDZ-EZ1 rev B1.
> >
> > * Someone pointed me at a datasheet that's supposed to be for the
> >   panel in front of me (sorry, I can't share the datasheet).  That
> >   datasheet has the string "p120zdg-bf1"
> >
> > * If I search for "P120ZDG-BF1" on the Internet I get hits for panels
> >   that are 2160x1440.  They don't have datasheets, but the fact that
> >   the resolution matches is a good sign.
> >
> > In any case, let's update the name and also the physical size to match
> > the correct panel.
> >
> > Fixes: da50bd4258db ("drm/panel: simple: Add Innolux TV123WAM panel driver support")
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > Cc: Sandeep Panda <spanda@...eaurora.org>
> > ---
> >
> >  drivers/gpu/drm/panel/panel-simple.c | 14 +++++++-------
> >  1 file changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index 937e97490c30..7ee1abc5d81b 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -1370,7 +1370,7 @@ static const struct panel_desc innolux_n156bge_l21 = {
> >       },
> >  };
> >
> > -static const struct drm_display_mode innolux_tv123wam_mode = {
> > +static const struct drm_display_mode innolux_p120zdg_bf1_mode = {
> >       .clock = 206016,
> >       .hdisplay = 2160,
> >       .hsync_start = 2160 + 48,
> > @@ -1384,13 +1384,13 @@ static const struct drm_display_mode innolux_tv123wam_mode = {
> >       .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
> >  };
> >
> > -static const struct panel_desc innolux_tv123wam = {
> > -     .modes = &innolux_tv123wam_mode,
> > +static const struct panel_desc innolux_p120zdg_bf1 = {
> > +     .modes = &innolux_p120zdg_bf1_mode,
> >       .num_modes = 1,
> >       .bpc = 8,
> >       .size = {
> > -             .width = 259,
> > -             .height = 173,
> > +             .width = 254,
> > +             .height = 169,
> >       },
> >       .delay = {
> >               .prepare = 200,
> > @@ -2454,8 +2454,8 @@ static const struct of_device_id platform_of_match[] = {
> >               .compatible = "innolux,n156bge-l21",
> >               .data = &innolux_n156bge_l21,
> >       }, {
> > -             .compatible = "innolux,tv123wam",
>
> I think we should update the struct, but we might want to keep this around.
> Given the tv123wam panel is TI, we're likely not going to have a collision on
> innolux,...
>
> That said, I'll defer to robh on this one, I'm not sure if changing names is
> cool once the bindings have hit mainline.

Rob gave the bindings patch a Reviewed-by tag, so I'm assuming he's
cool with it.  v2 still doesn't keep the "innolux,tv123wam" around.
If you disagree then let me know and I'll do a v3.

-Doug