RPI4B: what is needed for /dev/video10 to work ( v4l_m2m )

[Maxime Ripard]

Hi,

On Wed, Dec 27, 2023 at 04:19:19PM +0100, AL13N wrote:
> I have a RPI4B with upstream kernel 6.1 64bit and there is no /dev/video10
> present. I thought if I waited a bit more, it would appear in the kernel,
> but that was folly on my part.
> 
> Currently, watching a movie is painful since the software decoding is way
> too slow and it has very low fps on 1080p (or even 720p or even 480p)
> 
> IIRC, someone told me something else has to be fixed before the codecs can
> be done, but I don't remember what it was, or i didn't find it in my
> email/the archives.
> 
> Can someone tell me what exactly needs to be done (in kernel) so that I can
> take a crack at it, (hopefully with some help)?
> 
> I don't remember if this was relevant, but there was some talk of needing to
> use opengl output with a specific texture format for it to work? or is that
> seperate?

That's something for linux-media. The hardware codec isn't part of vc4
or v3d, it's a separate controller that requires a separate driver (in
v4l2).

That driver isn't upstream, and that would need the first thing to
tackle.

Maxime
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