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Message-ID: <53216533-d0d6-90d5-b9d1-c7d935867a54@tronnes.org>
Date:   Mon, 15 Aug 2022 12:48:20 +0200
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Subject: Re: [PATCH v1 03/35] drm/atomic: Add TV subconnector property to
 get/set_property
To:     Maxime Ripard <maxime@cerno.tech>
Cc:     Jernej Skrabec <jernej.skrabec@gmail.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Chen-Yu Tsai <wens@csie.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Jerome Brunet <jbrunet@baylibre.com>,
        Samuel Holland <samuel@sholland.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Daniel Vetter <daniel@ffwll.ch>, Emma Anholt <emma@anholt.net>,
        David Airlie <airlied@linux.ie>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org,
        Phil Elwell <phil@raspberrypi.com>,
        Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>,
        linux-arm-kernel@lists.infradead.org,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        linux-amlogic@lists.infradead.org, dri-devel@lists.freedesktop.org,
        Dom Cobley <dom@raspberrypi.com>,
        =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
References: <20220728-rpi-analog-tv-properties-v1-0-3d53ae722097@cerno.tech>
 <20220728-rpi-analog-tv-properties-v1-3-3d53ae722097@cerno.tech>
 <6e47ce2d-25c7-7254-703d-2a1d3bb64373@tronnes.org>
 <20220815073546.4isrl7o3bt5g23pk@houat>
From:   =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
In-Reply-To: <20220815073546.4isrl7o3bt5g23pk@houat>
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Den 15.08.2022 09.35, skrev Maxime Ripard:
> Hi Noralf,
> 
> Thanks for your review
> 
> On Mon, Aug 08, 2022 at 02:30:42PM +0200, Noralf Trønnes wrote:
>> Den 29.07.2022 18.34, skrev Maxime Ripard:
>>> The subconnector property was created by drm_mode_create_tv_properties(),
>>> but wasn't exposed to the userspace through the generic
>>> atomic_get/set_property implementation, and wasn't stored in any generic
>>> state structure.
>>>
>>> Let's solve this.
>>>
>>> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
>>
>> I just realised that this and the select_subconnector property isn't
>> used by any drivers. Do you plan to use them? Maybe they don't need to
>> be wired up at all.
> 
> I'm not sure really
> 
> It's true that the subconnector and select_subconnector fields in the TV
> connector state aren't used by any driver, but the ch7006 and nouveau
> will update the property content through a call to
> drm_object_property_set_value
> 
> https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/i2c/ch7006_drv.c#L217
> https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c#L185
> 
> I think it could still be useful to report it in the connector state, if
> only for consistency?
> 

Yeah maybe.

I just realised that I have support in the GUD protocol for these
properties so any future devices that rely on them them will need this
patch, so I'm now suddenly in favor of this :)

Noralf.