Not detecting any sound cards

Products Support DragonBoard 820c
#1

Hi Team,

I am working with kernel 4.14, debian build and 820 SoM.

When I look for the sound cards,

cat /proc/asound/cards

— no soundcards —

How to bring up the sound cards?

Thanks,
Ashik

#2

I believe qrtr package does some configuration to get soundcards up.
Does anyone know how this qrtr package is getting sound up??
Thanks…

#3

qrtr is used by slimbus to initialize the master on the adsp, which the rest of the audio pieces is waiting for. Ensuring that qrtr-ns is running (qrtr-ns 1 or qrtr-cfg 1; qrtr-ns) should be enough for that piece of the puzzle.

Regards,
Bjorn

#4

Thanks for the help…
Do we have to set it manually 1 everytime board boots ?
As sound output is a must can we modify the qrtr-ns API in a way that its always set to 1.

#5

qrtr-ns must be running, so you need to start that every time. And yes you need to launch it with the argument 1.

But isn’t there a systemd service that does this already?

#6

I am working with linaro’s snapshot : Linaro Snapshots
In this I didn’t find any system service for this purpose.
Do you know which service is enabling qrtr ??
Or is there any more reliable/stable release amongst those snapshots for DB820c??

Thanks…

#7

@ymj The qrtr package is installed [1], the service should be run at init, check with,

systemctl status qrtr.service

To discard any problems at init.

[1] https://snapshots.linaro.org/96boards/dragonboard820c/linaro/debian/228/linaro-buster-alip-dragonboard-820c-228.packages

#8

Hey
I found this strange issue that randomly once in 5-10 times soundcard doesn’t get registered.
And on reboot I found soundcard & also properly working qrtr.service :slight_smile:
Donno the cause of this strange behaviour… Though thanks for your help…

#9

Any update on the query??

I found that the instance when :
$ ps -eaf | grep wcd
root 2253 2 0 10:12 ? 00:00:00 [irq/203-wcd9335]

is running soundcard is registered.
On a reboot, there is no such process leading to no soundcard found issue.

Thanks in advance for any help in this…

#10

can you share both working/failing log (dmesg) via pastebin.

#11

Yes, logs are piled at soundcard_not_found - Pastebin.com.
The crash occured while stopping adsprpcd.service is collected at : root@820-devkit:~# reboot Stopping Hostname Service... Stopp - Pastebin.com

System goes to RamDump mode, Soundcard is not found on next bootup too.
Please find the logs in pastebin above, Thanks in advance…
@Loic