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Message-ID: <e0867d71-37c7-777f-0df2-0cd74909caaf@gmail.com>
Date: Sun, 16 Oct 2022 21:02:16 +0200
From: Mateusz Kwiatkowski <kfyatek@...il.com>
To: Maxime Ripard <maxime@...no.tech>,
Karol Herbst <kherbst@...hat.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
David Airlie <airlied@...ux.ie>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Lyude Paul <lyude@...hat.com>,
Maxime Ripard <mripard@...nel.org>,
Emma Anholt <emma@...olt.net>, Chen-Yu Tsai <wens@...e.org>,
Samuel Holland <samuel@...lland.org>,
Ben Skeggs <bskeggs@...hat.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Jernej Skrabec <jernej.skrabec@...il.com>
Cc: Dom Cobley <dom@...pberrypi.com>, linux-sunxi@...ts.linux.dev,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Noralf Trønnes <noralf@...nnes.org>,
intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
nouveau@...ts.freedesktop.org,
Geert Uytterhoeven <geert@...ux-m68k.org>,
linux-arm-kernel@...ts.infradead.org,
dri-devel@...ts.freedesktop.org,
Hans de Goede <hdegoede@...hat.com>,
Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v5 21/22] drm/vc4: vec: Add support for more analog TV
standards
Hi Maxime,
W dniu 13.10.2022 o 15:19, Maxime Ripard pisze:
> From: Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>
>
> Add support for the following composite output modes (all of them are
> somewhat more obscure than the previously defined ones):
>
> - NTSC_443 - NTSC-style signal with the chroma subcarrier shifted to
> 4.43361875 MHz (the PAL subcarrier frequency). Never used for
> broadcasting, but sometimes used as a hack to play NTSC content in PAL
> regions (e.g. on VCRs).
> - PAL_N - PAL with alternative chroma subcarrier frequency,
> 3.58205625 MHz. Used as a broadcast standard in Argentina, Paraguay
> and Uruguay to fit 576i50 with colour in 6 MHz channel raster.
> - PAL60 - 480i60 signal with PAL-style color at normal European PAL
> frequency. Another non-standard, non-broadcast mode, used in similar
> contexts as NTSC_443. Some displays support one but not the other.
The current version actually does not support PAL-60. Proper PAL-60 output from
VEC requires configuring it differently than for regular PAL. We have unified
the PAL and PAL-60 modes for the "TV mode" property, but the code here has not
been adjusted appropriately.
I'll try to submit an additional patch that fixes this shortly.
> - SECAM - French frequency-modulated analog color standard; also have
> been broadcast in Eastern Europe and various parts of Africa and Asia.
> Uses the same 576i50 timings as PAL.
>
> Also added some comments explaining color subcarrier frequency
> registers.
>
> Acked-by: Noralf Trønnes <noralf@...nnes.org>
> Signed-off-by: Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
(snip)
Best regards,
Mateusz Kwiatkowski
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