Librem 5: hang with cam -C1

[Pavel Machek]

Hi!

> > > > With -C100, it actually works, for both front and back cameras.
> > >
> > > great news \o/
> >
> > :). There's still bug somewhere, -C2 results in two buffer captured
> > and exit, -C1 results in hang, which is quite confusing.
> 
> As Laurent mentioned the CSI-2 receiver driver might require a
> min_queued_buffer of 2.
> 
> If you don't provide at least two buffers, streaming never starts.
> I don't see it being specified in mainline imx8mq-mipi-csi2.c though
> but my understanding is that you're on a very old kernel ?

Official one from PureOS:

Linux pureos 6.6.0-1-librem5 #1 SMP PREEMPT Wed Mar 12 17:55:39 EDT 2025 aarch64 GNU/Linux

Changing kernels is hard on phones :(.
								Pavel
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