linux-kernel - Re: [PATCH v3 1/2] drm/panel: simple: Add Waveshare 13.3" panel support

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Message-ID: <CAMuHMdXHKJYcP78WLUfGrN8v+PmChj7jEsjhnVXYnSOzZ7mkpw@mail.gmail.com>
Date: Mon, 19 Jan 2026 16:56:14 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Marek Vasut <marek.vasut+renesas@...lbox.org>
Cc: dri-devel@...ts.freedesktop.org, Conor Dooley <conor+dt@...nel.org>, 
	David Airlie <airlied@...il.com>, Jessica Zhang <jesszhan0024@...il.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Magnus Damm <magnus.damm@...il.com>, Maxime Ripard <mripard@...nel.org>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Rob Herring <robh@...nel.org>, 
	Sam Ravnborg <sam@...nborg.org>, Simona Vetter <simona@...ll.ch>, 
	Thierry Reding <thierry.reding@...il.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v3 1/2] drm/panel: simple: Add Waveshare 13.3" panel support

Hi Marek,

On Sat, 17 Jan 2026 at 01:50, Marek Vasut
<marek.vasut+renesas@...lbox.org> wrote:
> Add WaveShare 13.3inch 1920x1080 DSI Capacitive Touch Display support.
>
> While the panel is described as DPI panel, it is part of a larger unit
> in non-removable metal casing, so the actual internal configuration is
> not known. The panel is attached to "waveshare,dsi2dpi" bridge via DT.
> It is likely that internally, this panel is an LVDS panel, connected to
> ICN6211 DSI-to-DPI bridge and then another unknown DPI-to-LVDS bridge.
>
> Current device link is at https://www.waveshare.com/13.3inch-dsi-lcd.htm
>
> Signed-off-by: Marek Vasut <marek.vasut+renesas@...lbox.org>

Thanks for your patch!

> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -4998,6 +4998,33 @@ static const struct panel_desc vl050_8048nt_c01 = {
>         .bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
>  };
>
> +static const struct drm_display_mode waveshare_133inch_mode = {
> +       .clock = 148500,
> +       .hdisplay = 1920,
> +       .hsync_start = 1920 + 88,
> +       .hsync_end = 1920 + 88 + 44,
> +       .htotal = 1920 + 88 + 44 + 148,
> +       .vdisplay = 1080,
> +       .vsync_start = 1080 + 4,
> +       .vsync_end = 1080 + 4 + 5,
> +       .vtotal = 1080 + 4 + 5 + 36,
> +       .flags = DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_PHSYNC,
> +};

That looks like the plain standard 60Hz Full HD mode.
Is there really no other copy of that structure available in the kernel?

auo_t215hvn01_mode is almost the same, except for .clock and .flags.
drivers/video/fbdev/core/modedb.c has the same mode, but in a different
structure.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds