Re: [PATCH v1 04/35] drm/modes: Introduce 480i and 576i modes

[Geert Uytterhoeven]

Hi Maxime,

On Mon, Aug 29, 2022 at 3:30 PM Maxime Ripard <maxime@xxxxxxxxxx> wrote:
> On Wed, Aug 24, 2022 at 06:42:18PM +0200, Mateusz Kwiatkowski wrote:
> > - Speaking of closed captioning... a lot of different stuff were put in the
> >   blanking interval over the years. Like teletext in Europe. There are projects
> >   like VBIT2 <https://github.com/peterkvt80/vbit2> which intentionally
> >   reconfigure the Raspberry Pi composite output to include the blanking interval
> >   in the framebuffer so that teletext can be output by drawing on the edge of
> >   the "screen" (from the computer point of view).
>
> I'm not sure how we would support this in KMS to be honest. Asking for a
> wider mode and the userspace putting whatever it wants in the margins
> seems like a good choice.

s/wider/higher/

Teletext is transmitted in the "visible" parts of (horizontal) lines, but during
the vertical blank.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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