linux-kernel - Re: [PATCH v2 2/6] drm/panel: simple: Add support for LG LP097QX1-SPA1 2048x1536 panel

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Message-ID: <20160610132617.GH27142@ulmo.ba.sec>
Date:	Fri, 10 Jun 2016 15:26:17 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Emil Velikov <emil.l.velikov@...il.com>
Cc:	Yakir Yang <ykk@...k-chips.com>, David Airlie <airlied@...ux.ie>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	devicetree <devicetree@...r.kernel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v2 2/6] drm/panel: simple: Add support for LG
 LP097QX1-SPA1 2048x1536 panel

On Wed, Jun 08, 2016 at 01:20:22PM +0100, Emil Velikov wrote:
> Hi Yakir,
> 
> On 8 June 2016 at 12:52, Yakir Yang <ykk@...k-chips.com> wrote:
> > The LG LP097QX1-SPA1 is an 9.7", 2048x1536 (QXGA) TFT-LCD panel
> > connected using eDP interfaces.
> >
> > Signed-off-by: Yakir Yang <ykk@...k-chips.com>
> > ---
> > Changes in v2: None
> >
> >  drivers/gpu/drm/panel/panel-simple.c | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index 3a7bdf1..41020e1 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -1040,6 +1040,28 @@ static const struct panel_desc lg_lp120up1 = {
> >         },
> >  };
> >
> > +static const struct drm_display_mode lg_lp097qx1_spa1_mode = {
> I believe that lg_lp097qx1_spa1 should be moved/sorted before lg_lp120up1.
> 
> > +static const struct panel_desc lg_lp097qx1_spa1 = {
> > +       .modes = &lg_lp097qx1_spa1_mode,
> > +       .num_modes = 1,
> > +       .size = {
> > +               .width = 2048,
> > +               .height = 1536,
> These are the physical dimensions of the panel. From the documentation
> (at the top of the file)
> 
> @width: width (in millimeters) of the panel's active display area
> ...
> 
> Thierry, perhaps it's worth renaming 'size' it to
> "physical_{size,dimensions}" and/or alike to make it clearer ?

I like size because it's nice and short, and it's accurate. 2048x1536 is
a resolution, not a size. Like you said, it's already documented, and if
people looked at other descriptors they should realize that it's not the
same as the horizontal and vertical resolutions.

> Looks like we have a few cases were people got confused -
> innolux_zj070na_01p and samsung_ltn101nt05.

Yeah, well, I'm to blame for that, I should've reviewed more carefully.
Thanks for bringing that to my attention, I'll go fix those up.

Thierry

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