[Alsa-user] USB audio on riscv64

[Kip Warner]

On Fri, 2021-11-05 at 11:17 +0100, Takashi Iwai wrote:
> Check the contents in /proc/asound/cards.  Is that empty as well?

Thanks for getting back to me, Takashi. Looks like it's empty:

   $ sudo tree /proc/asound/
   /proc/asound/
   ├── Device -> card1
   ├── card1
   │   ├── id
   │   ├── pcm0p
   │   │   ├── info
   │   │   └── sub0
   │   │       ├── hw_params
   │   │       ├── info
   │   │       ├── status
   │   │       └── sw_params
   │   ├── stream0
   │   ├── usbbus
   │   ├── usbid
   │   └── usbmixer
   ├── cards
   ├── devices
   ├── hwdep
   ├── modules
   ├── oss
   │   ├── devices
   │   └── sndstat
   ├── pcm
   ├── seq
   │   ├── clients
   │   ├── drivers
   │   ├── queues
   │   └── timer
   ├── timers
   └── version
   
   6 directories, 23 files

> If the card is recognized there, check the /sys/class/sound/*.

This is what I see in that directory:

   $ sudo tree /sys/class/sound/
   /sys/class/sound/
   ├── card1 -> ../../devices/platform/soc/e00000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:02.0/0000:04:00.0/usb1/1-2/1-2.1/1-2.1:1.0/sound/card1
   ├── controlC1 -> ../../devices/platform/soc/e00000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:02.0/0000:04:00.0/usb1/1-2/1-2.1/1-2.1:1.0/sound/card1/controlC1
   ├── pcmC1D0p -> ../../devices/platform/soc/e00000000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/0000:02:02.0/0000:04:00.0/usb1/1-2/1-2.1/1-2.1:1.0/sound/card1/pcmC1D0p
   ├── seq -> ../../devices/virtual/sound/seq
   └── timer -> ../../devices/virtual/sound/timer
   
   5 directories, 0 files

> If a PCM device is found there, it must be the lack of the
> corresponding device in /dev/snd/* that is usually created via udev.

And this is what I see there:

   $ sudo tree /dev/snd/
   /dev/snd/
   ├── by-id
   │   └── usb-Generic_USB2.0_Device_20130100ph0-00 -> ../controlC1
   ├── by-path
   │   └── platform-e00000000.pcie-pci-0000:04:00.0-usb-0:2.1:1.0 -> ../controlC1
   ├── controlC1
   ├── pcmC1D0p
   ├── seq
   └── timer
   
   2 directories, 6 files

A bit of information on my system:

   $ uname -a
   Linux kip-unmatched 5.11.0-1021-generic #22-Ubuntu SMP Tue Sep 28 15:19:16 UTC 2021 riscv64 riscv64 riscv64 GNU/Linux
   
   $ lscpu 
   Architecture:        riscv64
   Byte Order:          Little Endian
   CPU(s):              4
   On-line CPU(s) list: 0-3
   Thread(s) per core:  4
   Core(s) per socket:  1
   Socket(s):           1
   L1d cache:           32 KiB
   L1i cache:           32 KiB
   L2 cache:            2 MiB

I've also attached the output of the alsa-info(1) generated log.

-- 
Kip Warner -- Senior Software Engineer
OpenPGP signed/encrypted mail preferred
https://www.thevertigo.com
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