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

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Message-ID: <20220829143357.rih7vmxnd434n5eo@houat>
Date:   Mon, 29 Aug 2022 16:33:57 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Mateusz Kwiatkowski <kfyatek@...il.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jerome Brunet <jbrunet@...libre.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Emma Anholt <emma@...olt.net>,
        David Airlie <airlied@...ux.ie>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-sunxi@...ts.linux.dev,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Phil Elwell <phil@...pberrypi.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Dom Cobley <dom@...pberrypi.com>
Subject: Re: [PATCH v1 04/35] drm/modes: Introduce 480i and 576i modes

On Mon, Aug 29, 2022 at 04:14:54PM +0200, Geert Uytterhoeven wrote:
> Hi Maxime,
> 
> On Mon, Aug 29, 2022 at 3:30 PM Maxime Ripard <maxime@...no.tech> 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.

Yeah, sorry I meant wider as in larger than the active area, without any
direction in mind. Thanks for the correction :)

Maxime

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