Re: [PATCH] Experimental vchiq and bcm2835_audio support for arm64

 
Van: Ronald Klop <[email protected]>
Datum: maandag, 7 februari 2022 21:05
Aan: Marco Devesas Campos <[email protected]>, [email protected]
Onderwerp: Re: [PATCH] Experimental vchiq and bcm2835_audio support for arm64
> 
> On 2/6/22 14:46, Marco Devesas Campos wrote:
> > Hi Ronald,
> >
> > Thanks so much for trying out the patch out.
> >
> >> On 6 Feb 2022, at 13:05, Ronald Klop <[email protected]> wrote:
> >>
> >> Hi,
> >>
> >> I compiled this on a RPI4 + 14-CURRENT. It boots, but I see no difference in available devices.
> >> I can try to boot it on a RPI3B+ on another time.
> >
> > I *think* the GPU/VC in RPI-4 is a very different beast from the others. I'll
> > look into it, but if you could give it a try on the 3+ I'd be much obliged.
> >
> >>
> >> What would be the expected outcome? Where should I look at (or listen to)?
> >>
> >
> > You should see something like
> >
> >    vchiq0: <BCM2835 VCHIQ> mem 0x7e00b840-0x7e00b87b irq 54 on simplebus0
> >    vchiq: local ver 8 (min 3), remote ver 8.
> >    pcm0: <VCHIQ audio> on vchiq0
> >
> > in your dmesg output.
> >
> > The file /dev/vchiq should exist, as well as the following sysctl-s (I'm
> > assuming no other audio devices are attached)
> >
> >    % sysctl dev.pcm
> >    dev.pcm.0.trace: 0
> >    ...
> >    dev.pcm.0.dest: 0
> >    ...
> >    dev.pcm.0.%parent: vchiq0
> >    ...
> >    dev.pcm.0.%driver: pcm
> >    dev.pcm.0.%desc: VCHIQ audio
> >    …
> >
> > Then if you `cat < /dev/random > /dev/dsp` you should hear some static coming
> > out of whatever is connected to hdmi (maybe headphones too? otherwise try
> > setting `sysctl dev.pcm.0.dest=1`)
> >
> > Best,
> > Marco
> 
> 
> Hi,
> 
> Booted the patched 14-CURRENT on the RPI3B+.
> 
> dmesg diff:
> +vchiq0: <BCM2835 VCHIQ> mem 0x7e00b840-0x7e00b87b irq 54 on simplebus0
> +vchiq: local ver 8 (min 3), remote ver 8.
> +pcm0: <VCHIQ audio> on vchiq0
> 
> [root@rpi3 ~]# cat /dev/sndstat
> Installed devices:
> pcm0: <VCHIQ audio> (play) default
> No devices installed from userspace.
> 
> [root@rpi3 ~]# sysctl dev.pcm
> dev.pcm.0.trace: 0
> dev.pcm.0.starved: 0
> dev.pcm.0.freebuffer: 40000
> dev.pcm.0.underruns: 0
> dev.pcm.0.retrieved: 0
> dev.pcm.0.submitted: 0
> dev.pcm.0.callbacks: 0
> dev.pcm.0.dest: 0
> dev.pcm.0.mode: 3
> dev.pcm.0.bitperfect: 0
> dev.pcm.0.buffersize: 0
> dev.pcm.0.play.vchanformat: s16le:2.0
> dev.pcm.0.play.vchanrate: 48000
> dev.pcm.0.play.vchanmode: fixed
> dev.pcm.0.play.vchans: 1
> dev.pcm.0.%parent: vchiq0
> dev.pcm.0.%pnpinfo:
> dev.pcm.0.%location:
> dev.pcm.0.%driver: pcm
> dev.pcm.0.%desc: VCHIQ audio
> dev.pcm.%parent:
> 
> 
> To play some audio I need to search some headphones first. :-)
> 
> Ronald.
>  
> 
> 
> 


Good morning,

Found headphones with a cable on the attic. Plugged it into the audio jack and played an mp3. Amazing!

Regards,
Ronald.