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Date:   Fri, 9 Sep 2022 16:00:59 +0200
From:   Maxime Ripard <maxime@cerno.tech>
To:     Mateusz Kwiatkowski <kfyatek@gmail.com>
Cc:     Ben Skeggs <bskeggs@redhat.com>, David Airlie <airlied@linux.ie>,
        Chen-Yu Tsai <wens@csie.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Lyude Paul <lyude@redhat.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
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        Samuel Holland <samuel@sholland.org>,
        Karol Herbst <kherbst@redhat.com>,
        Noralf =?utf-8?Q?Tr=C3=B8nnes?= <noralf@tronnes.org>,
        Emma Anholt <emma@anholt.net>, Daniel Vetter <daniel@ffwll.ch>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
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        Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v2 10/41] drm/modes: Add a function to generate analog
 display modes
Message-ID: <20220909140059.g57oihcmhuym62ei@houat>
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On Wed, Sep 07, 2022 at 11:31:21PM +0200, Mateusz Kwiatkowski wrote:
> The "canonical" modelines (at least for vc4's VEC, see the notes below):
>=20
> - (vfp=3D=3D4, vsync=3D=3D6, vbp=3D=3D39) for 576i
> - (vfp=3D=3D7, vsync=3D=3D6, vbp=3D=3D32) for 480i
> - (vfp=3D=3D5, vsync=3D=3D6, vbp=3D=3D28) for 486i (full frame NTSC as or=
iginally specified)

It's not clear to me either how you come up with those timings?

Maxime

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