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Date: Wed, 17 Aug 2022 15:05:52 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Maxime Ripard <maxime@...no.tech> Cc: 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>, Mateusz Kwiatkowski <kfyatek+publicgit@...il.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 05/35] drm/connector: Add TV standard property Hi Maxime, On Wed, Aug 17, 2022 at 1:15 PM Maxime Ripard <maxime@...no.tech> wrote: > On Wed, Aug 17, 2022 at 10:35:07AM +0200, Geert Uytterhoeven wrote: > > On Wed, Aug 17, 2022 at 9:47 AM Maxime Ripard <maxime@...no.tech> wrote: > > > On Wed, Aug 17, 2022 at 09:31:18AM +0200, Geert Uytterhoeven wrote: > > > > On Tue, Aug 16, 2022 at 5:50 PM Maxime Ripard <maxime@...no.tech> wrote: > > > > > On Tue, Aug 16, 2022 at 04:43:44PM +0200, Geert Uytterhoeven wrote: > > > > > > > > > > Either you have to add them here (e.g. "hd720p50" and "hd720p60"), or > > > > > > > > > > handle them through "@<refresh>". The latter would impact "[PATCH v1 > > > > > > > > > > 09/35] drm/modes: Move named modes parsing to a separate function", as > > > > > > > > > > currently a named mode and a refresh rate can't be specified both. > > > > > > > > > > > > > > > > > > I think the former would make more sense. It simplifies a bit the > > > > > > > > > parser, and we're going to use a named mode anyway. > > > > > > > > > > > > > > > > > > > As "[PATCH v1 34/35] drm/modes: Introduce the tv_mode property as a > > > > > > > > > > command-line option" uses a separate "tv_mode" option, and not the main > > > > > > > > > > mode name, I think you want to add them here. > > > > > > > > > > > > > > > > > > It's a separate story I think, we could have a named mode hd720p50, > > > > > > > > > which would be equivalent to 1280x720,tv_mode=hd720p > > > > > > > > > > > > > > > > So where's the field rate in "1280x720,tv_mode=hd720p"? > > > > > > > > > > > > > > Yeah, sorry I meant 1280x720@50,tv_mode=hd720p > > > > > > > > > > > > Above you said "I think the former would make more sense", so that > > > > > > should be "1280x720,tv_mode=hd720p50"? > > > > > > > > > > No, 720p at 50Hz would be either hd720p50 or 1280x720@50,tv_mode=hd720p > > > > > and 60Hz would be hd720p60 or 1280x720@60,tv_mode=hd720p > > > > > > > > I disagree: hd720p50 and hd720p60 are different TV modes. > > > > > > I agree, and I don't see how that command-line doesn't express that? > > > > Oh, I see what you mean: yes, it expresses that. > > But it is inconsistent with the NTSC/PAL/SECAM/hd{480,576}[ip] modes, > > where the TV mode specifies both number of lines and frame rate. > > Only if we're using a named mode, and naming is hard :) That's not true: "640x480,tv_mode=PAL-N" would give me a mode with 625 lines and 25 frames/s, "640x480,tv_mode=PAL-M" would give me a mode with 525 lines and 30 frames/s. > Honestly, I'd be inclined to drop the hd* for now from this series. I > don't have a hardware to test it with, for some we don't even have > drivers that could implement these modes, we don't have a spec to work > from, it looks like a recipe for failure :) OK. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org 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
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