(snd_pcm_hw_open) failed (-22): Invalid argument

27 Sep 2022


      Hi
I am facing an issue while doing the bring-up of the ZL38050 Audio Card
from Microsemi on the Ambarella ARM platform.
I am able to see the card entry in /proc/asound/cards.
On executing aplay/arecord I get below error:
[image: Screenshot from 2022-09-26 14-44-30.png]
On enabling the LIBASOUND_DEBUG=1 I could see below error line :
ALSA lib ../../../src/pcm/pcm_hw.c:1715:(snd_pcm_hw_open) open
'/dev/snd/pcmC0D0p' failed (-22): Invalid argument
Can anyone guide where the problem could be, is it due to any configuration
mismatch in dtsi or in driver.
Also sharing the dtsi changes made to enable this codec.
sound {
compatible = "fsl,ms-dac";
       model = "zl380tw";
       //codec-name = "zl380tw @ AMBEVK";
       //codec-name = "ZL380TW0";
       codec-name = "codec";
       cpu-dai = <&i2s0>;
       audio-codec = <&zl380tw>;
       codec-dai-name = "zl380tw0-hifi";
       stream-name = "ZL380TW0-STREAM";
}
Following node added in SPI :
            zl380tw: codec@1 {
                compatible = "ms,zl380tw";
                spi-max-frequency = <20000000>;
                #sound-dai-cells = <0>;
                spi-cpha;
                spi-cpol;
                reg = <0>;
                status = "ok";
            };

(snd_pcm_hw_open) failed (-22): Invalid argument

Arjav Parikh