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Date: Fri, 9 Sep 2022 16:00:59 +0200
From: Maxime Ripard <maxime@...no.tech>
To: Mateusz Kwiatkowski <kfyatek@...il.com>
Cc: Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
Chen-Yu Tsai <wens@...e.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Lyude Paul <lyude@...hat.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>,
Karol Herbst <kherbst@...hat.com>,
Noralf Trønnes <noralf@...nnes.org>,
Emma Anholt <emma@...olt.net>, Daniel Vetter <daniel@...ll.ch>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Hans de Goede <hdegoede@...hat.com>,
linux-arm-kernel@...ts.infradead.org,
Phil Elwell <phil@...pberrypi.com>,
intel-gfx@...ts.freedesktop.org,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
dri-devel@...ts.freedesktop.org, Dom Cobley <dom@...pberrypi.com>,
linux-kernel@...r.kernel.org, nouveau@...ts.freedesktop.org,
linux-sunxi@...ts.linux.dev,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v2 10/41] drm/modes: Add a function to generate analog
display modes
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):
>
> - (vfp==4, vsync==6, vbp==39) for 576i
> - (vfp==7, vsync==6, vbp==32) for 480i
> - (vfp==5, vsync==6, vbp==28) for 486i (full frame NTSC as originally specified)
It's not clear to me either how you come up with those timings?
Maxime
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