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 <ronald-lists@klop.ws> 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.