linux-kernel - Re: [PATCH v3 4/6] drm/panel: simple: Add support for Samsung LSN122DL01-C01 2560x1600 panel

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Date:	Mon, 13 Jun 2016 10:00:45 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Yakir Yang <ykk@...k-chips.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Thierry Reding <thierry.reding@...il.com>,
	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>,
	Emil Velikov <emil.l.velikov@...il.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/6] drm/panel: simple: Add support for Samsung
 LSN122DL01-C01 2560x1600 panel

Yakir,

On Sat, Jun 11, 2016 at 7:56 PM, Yakir Yang <ykk@...k-chips.com> wrote:
> The Samsung LSN122DL01-C01 is an 12.2" 2560x1600 (WQXGA) TFT-LCD panel
> connected using eDP interfaces.
>
> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
> ---
> Changes in v3:
> - Correct the size of panel_desc to active area 262mmx164mm (Emil, Stéphane)
>
> 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 2d40a21..17cc973 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1246,6 +1246,28 @@ static const struct panel_desc qd43003c0_40 = {
>         .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
>  };
>
> +static const struct drm_display_mode samsung_lsn122dl01_c01_mode = {
> +       .clock = 271560,
> +       .hdisplay = 2560,
> +       .hsync_start = 2560 + 48,
> +       .hsync_end = 2560 + 48 + 32,
> +       .htotal = 2560 + 48 + 32 + 80,
> +       .vdisplay = 1600,
> +       .vsync_start = 1600 + 2,
> +       .vsync_end = 1600 + 2 + 5,
> +       .vtotal = 1600 + 2 + 5 + 57,
> +       .vrefresh = 60,
> +};
> +
> +static const struct panel_desc samsung_lsn122dl01_c01 = {
> +       .modes = &samsung_lsn122dl01_c01_mode,
> +       .num_modes = 1,
> +       .size = {
> +               .width = 262,
> +               .height = 164,

Earlier you said that the active area of this panel was:

> Display area     262.656(H) X 164.16(V)         (12.2”diagonal)

In other panels I looked at the EDID tended to round numbers, not
truncate them.  For instance the Starry panel that I sent the patch
for says in the manual "262.7712 (H) x 164.232 (V)" but then the EDID
says "263 x 164".

That would mean your width should be 263 mm, not 262 mm.

-Doug