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From:   Mateusz Kwiatkowski <kfyatek@gmail.com>
Message-ID: <aa510ec2-a72d-364b-424e-816872ab6923@gmail.com>
Date:   Thu, 8 Sep 2022 13:31:34 +0200
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Subject: Re: [PATCH v2 32/41] drm/vc4: vec: Convert to the new TV mode
 property
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To:     Maxime Ripard <maxime@cerno.tech>,
        =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
Cc:     Ben Skeggs <bskeggs@redhat.com>, David Airlie <airlied@linux.ie>,
        Chen-Yu Tsai <wens@csie.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Lyude Paul <lyude@redhat.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Samuel Holland <samuel@sholland.org>,
        Karol Herbst <kherbst@redhat.com>,
        Emma Anholt <emma@anholt.net>, Daniel Vetter <daniel@ffwll.ch>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Hans de Goede <hdegoede@redhat.com>,
        linux-arm-kernel@lists.infradead.org,
        Phil Elwell <phil@raspberrypi.com>,
        intel-gfx@lists.freedesktop.org,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        dri-devel@lists.freedesktop.org, Dom Cobley <dom@raspberrypi.com>,
        linux-kernel@vger.kernel.org, nouveau@lists.freedesktop.org,
        linux-sunxi@lists.linux.dev,
        Mateusz Kwiatkowski <kfyatek+publicgit@gmail.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>
References: <20220728-rpi-analog-tv-properties-v2-0-459522d653a7@cerno.tech>
 <20220728-rpi-analog-tv-properties-v2-32-459522d653a7@cerno.tech>
 <199cf4b3-8ace-e047-3050-b810cf0c6b63@tronnes.org>
 <20220908112312.hlb7mzneuxnethhr@houat>
In-Reply-To: <20220908112312.hlb7mzneuxnethhr@houat>
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Precedence: bulk

Hi Maxime,

W dniu 08.09.2022 o 13:23, Maxime Ripard pisze:
> Hi Noralf,
>
> On Tue, Aug 30, 2022 at 09:01:08PM +0200, Noralf Trønnes wrote:
>>> +static const struct drm_prop_enum_list tv_mode_names[] = {
>>
>> Maybe call it legacy_tv_mode_enums?
>>
>>>
>>> +    { VC4_VEC_TV_MODE_NTSC, "NTSC", },
>>>
>>> +    { VC4_VEC_TV_MODE_NTSC_J, "NTSC-J", },
>>>
>>> +    { VC4_VEC_TV_MODE_PAL, "PAL", },
>>>
>>> +    { VC4_VEC_TV_MODE_PAL_M, "PAL-M", },
>>
>> If you use DRM_MODE_TV_MODE_* here you don't need to translate the value
>> using the switch statement in get/set property, you can use the value
>> directly to get/set tv.mode.
>
> I'm sorry, I'm not quite sure what you mean by that. If we expose the
> DRM_MODE_TV_MODE_* properties there, won't that change the values the
> userspace will need to use to set that property?

I'd just like to point out that if numerical values of these enums are your
concern, then you're (or perhaps I am ;) already breaking this by adding new
modes in patch 33/41 in this series.

And the values (and names!) added by that patch (33/41) don't match those
currently used by the downstream version
(https://github.com/raspberrypi/linux/blob/rpi-5.15.y/drivers/gpu/drm/vc4/vc4_vec.c).
If any userspace software is manipulating this property, it's most likely
targeting the downstream code. But since you're not aiming for consistency with
that, I was under the impression that compatibility isn't a concern.

Best regards,
Mateusz Kwiatkowski