linux-kernel - Re: [PATCH v16 3/7] drm/vkms: Drop YUV formats TODO

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Message-ID: <Z5zJ1h91AINbQRVF@louis-chauvet-laptop>
Date: Fri, 31 Jan 2025 14:02:14 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: José Expósito <jose.exposito89@...il.com>
Cc: airlied@...il.com, arthurgrillo@...eup.net, corbet@....net,
	dri-devel@...ts.freedesktop.org, hamohammed.sa@...il.com,
	jeremie.dautheribes@...tlin.com, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
	mairacanal@...eup.net, marcheu@...gle.com, melissa.srw@...il.com,
	miquel.raynal@...tlin.com, mripard@...nel.org,
	nicolejadeyee@...gle.com, pekka.paalanen@...oniitty.fi,
	rdunlap@...radead.org, rodrigosiqueiramelo@...il.com,
	seanpaul@...gle.com, simona.vetter@...ll.ch, simona@...ll.ch,
	thomas.petazzoni@...tlin.com, tzimmermann@...e.de
Subject: Re: [PATCH v16 3/7] drm/vkms: Drop YUV formats TODO

On 31/01/25 - 09:40, José Expósito wrote:
> Hi Louis,
> 
> Thanks a lot for the patches.
> 
> I'm not well versed in YUV color formats, so I did my best reading the kernel
> documentation before reviewing this series... But I'll most likely ask some
> basic/dump questions.
> 
> > From: Arthur Grillo <arthurgrillo@...eup.net>
> > 
> > VKMS has support for YUV formats now. Remove the task from the TODO
> > list.
> > 
> > Signed-off-by: Arthur Grillo <arthurgrillo@...eup.net>
> > Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> > ---
> >  Documentation/gpu/vkms.rst | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
> > index ba04ac7c2167a9d484c54c69a09a2fb8f2d9c0aa..13b866c3617cd44043406252d3caa912c931772f 100644
> > --- a/Documentation/gpu/vkms.rst
> > +++ b/Documentation/gpu/vkms.rst
> > @@ -122,8 +122,7 @@ There's lots of plane features we could add support for:
> >  
> >  - Scaling.
> >  
> > -- Additional buffer formats, especially YUV formats for video like NV12.
> > -  Low/high bpp RGB formats would also be interesting.
> > +- Additional buffer formats. Low/high bpp RGB formats would be interesting.
> 
> I see that you implemented support for 6 DRM_FORMAT_NV* formats, but
> DRM_FORMAT_NV15, DRM_FORMAT_NV20 and DRM_FORMAT_NV30 are not implemented.
> 
> The same applies to DRM_FORMAT_Y210 or DRM_FORMAT_YUV410 among others.
> 
> Could it be useful to implement all of them in the future? If so, should we add
> it to the ToDo list?

I don't think we need "all of them" (there are ≈100 + all the modifiers), 
but definitly all the commonly used ones (I have some of the "common" one 
ready here [1], I just wait for the YUV series to be accepted to avoid 
conflicts).

> It might be a great task to get started in kernel development, as there are
> already similar examples and tests.

I don't think we need to specify which format are missing, the point 
"Additionnal buffer formats. [...]" seems sufficient. If you think this is 
relevant, I can add "Easy task" so beginners will find it easier?
 
[1]:https://lore.kernel.org/all/20241122-b4-new-color-formats-v3-0-23f7776197c9@bootlin.com/

> >  
> >  - Async updates (currently only possible on cursor plane using the legacy
> >    cursor api).
> >