We have deployed a Yocto build rpb console image.
root@dragonboard-845c:~# cat /etc/os-release
ID=poky
NAME="Poky (Yocto Project Reference Distro)"
VERSION="4.0.3 (kirkstone)"
VERSION_ID=4.0.3
PRETTY_NAME="Poky (Yocto Project Reference Distro) 4.0.3 (kirkstone)"
DISTRO_CODENAME="kirkstone"
root@dragonboard-845c:~# uname -a
Linux dragonboard-845c 5.15.7-linaro-lt-qcom #1 SMP PREEMPT Tue Dec 14 00:11:28 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
The sound cards seem to be detected
root@dragonboard-845c:~# ls /dev/snd
by-path comprC0D3 controlC0 pcmC0D0c pcmC0D0p pcmC0D1c pcmC0D1p pcmC0D2c pcmC0D2p timer
root@dragonboard-845c:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: DB845c [DB845c], device 0: MultiMedia1 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: DB845c [DB845c], device 1: MultiMedia2 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: DB845c [DB845c], device 2: MultiMedia3 (*) []
Subdevices: 1/1
Subdevice #0: subdevice #0
However, trying to play any audio file like
root@dragonboard-845c:~# aplay /mnt/sample01.wav
Playing WAVE '/mnt/sample01.wav' : Float 32 bit Little Endian, R[ 2666.991328] Multiate 192000 Hz, Mono
[ 2667.003115] MultiMedia1: ASoC: dpcm_fe_dai_prepare() failed (-22)
aplay: set_params:1416: Unable to install hw params:
ACCESS: RW_INTERLEAVED
FORMAT: FLOAT_LE
SUBFORMAT: STD
SAMPLE_BITS: 32
FRAME_BITS: 32
CHANNELS: 1
RATE: 192000
PERIOD_TIME: (85333 85334)
PERIOD_SIZE: 16384
PERIOD_BYTES: 65536
PERIODS: 6
BUFFER_TIME: 512000
BUFFER_SIZE: 98304
BUFFER_BYTES: 393216
TICK_TIME: 0
Checking in dmesg shows
[ 79.214823] MultiMedia1: ASoC: no backend DAIs enabled for MultiMedia1
[ 79.222824] MultiMedia1: ASoC: dpcm_fe_dai_prepare() failed (-22)
[ 2666.991328] MultiMedia1: ASoC: no backend DAIs enabled for MultiMedia1
[ 2667.003115] MultiMedia1: ASoC: dpcm_fe_dai_prepare() failed (-22)
I have also tried with Linaro release on this link and get the same result. Linaro Releases
Can someone help with getting this working? Ideally, we wanted to check compressed offload support provided by comprC0D3 node, but it seems even basic audio playback is broken.
On the hardware side, Audio mezzanine is connected to RB3. Is there some hardware setting that we might be missing?
