linux-kernel - Re: [PATCH v1 05/35] drm/connector: Add TV standard property

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Date:   Tue, 16 Aug 2022 16:11:16 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
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

On Tue, Aug 16, 2022 at 03:29:07PM +0200, Geert Uytterhoeven wrote:
> Hi Maxime,
> 
> On Tue, Aug 16, 2022 at 3:20 PM Maxime Ripard <maxime@...no.tech> wrote:
> > On Fri, Aug 12, 2022 at 03:25:18PM +0200, Geert Uytterhoeven wrote:
> > > > --- a/drivers/gpu/drm/drm_connector.c
> > > > +++ b/drivers/gpu/drm/drm_connector.c
> > > > @@ -1649,11 +1650,40 @@ EXPORT_SYMBOL(drm_mode_create_tv_margin_properties);
> > > >   * 0 on success or a negative error code on failure.
> > > >   */
> > > >  int drm_mode_create_tv_properties(struct drm_device *dev,
> > > > +                                 unsigned int supported_tv_norms,
> > > >                                   unsigned int num_modes,
> > > >                                   const char * const modes[])
> > > >  {
> > > > +       static const struct drm_prop_enum_list tv_norm_values[] = {
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_NTSC_443) - 1, "NTSC-443" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_NTSC_J) - 1, "NTSC-J" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_NTSC_M) - 1, "NTSC-M" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_60) - 1, "PAL-60" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_B) - 1, "PAL-B" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_D) - 1, "PAL-D" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_G) - 1, "PAL-G" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_H) - 1, "PAL-H" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_I) - 1, "PAL-I" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_M) - 1, "PAL-M" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_N) - 1, "PAL-N" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_PAL_NC) - 1, "PAL-Nc" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_60) - 1, "SECAM-60" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_B) - 1, "SECAM-B" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_D) - 1, "SECAM-D" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_G) - 1, "SECAM-G" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_K) - 1, "SECAM-K" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_K1) - 1, "SECAM-K1" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_SECAM_L) - 1, "SECAM-L" },
> > >
> > > The above are analog standards, with a variable horizontal resolution.
> > >
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_HD480I) - 1, "hd480i" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_HD480P) - 1, "hd480p" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_HD576I) - 1, "hd576i" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_HD576P) - 1, "hd576p" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_HD720P) - 1, "hd720p" },
> > > > +               { __builtin_ffs(DRM_MODE_TV_NORM_HD1080I) - 1, "hd1080i" },
> > >
> > > The above are digital standards, with a fixed resolution.
> >
> > Are they?
> >
> > It's not clear to me from looking at nouveau, but I was under the
> > impression that they were modes for a component output, so CEA 770.3. I
> > don't have the spec though, so I can't check.
> 
> Oh right, I forgot about analog HD over component, where you can use
> other pixel clocks than in the digital standard.
> 
> > > You seem to have missed "hd1080p"?
> >
> > Nobody is using it. If we ever have a driver that uses it I think we can
> > add it.
> 
> The PS3 supports 1080p over component
> https://manuals.playstation.net/document/en/ps3/current/settings/videooutput.html

Yeah, and iirc the Xbox360 did too, but what I meant by nobody is using
it is that there's no driver using it currently.

> > > In addition, "hd720p", "hd080i", and "hd1080p" are available in both 50
> > > and 60 (actually 59.94) Hz, while "hd1080p" can also use 24 or 25 Hz.
> >
> > It looks like nouveau only exposes modes for 480p at 59.94Hz, 576p at
> > 50Hz, 720p at 60Hz, 1080i at 30Hz.
> 
> PS3 supports both 50 and 60 Hz (same link above).

I'm probably wary on this, but I'd rather stay at feature parity for
this series. There's already plenty of occasion to screw up something
that I'd rather not introduce new stuff I haven't been able to test :)

Provided we can easily extend it to support these additional features of
course :)

> > > 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

Maxime

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