linux-kernel - Re: [PATCH v1 03/35] drm/atomic: Add TV subconnector property to get/set

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Date:   Mon, 15 Aug 2022 12:48:20 +0200
From:   Noralf Trønnes <noralf@...nnes.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>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Phil Elwell <phil@...pberrypi.com>,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        Dom Cobley <dom@...pberrypi.com>,
        Noralf Trønnes <noralf@...nnes.org>
Subject: Re: [PATCH v1 03/35] drm/atomic: Add TV subconnector property to
 get/set_property



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@...no.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.