topic Re: Dose imx6 yocto BSP including fsl-alsa-plugin? in i.MX Processors

Dose imx6 yocto BSP including fsl-alsa-plugin?

arc_lin — Thu, 29 Nov 2018 07:51:04 GMT

Hi All,

I am trying to use hardware ASRC, and it supported by fsl-alsa-plugin.

But according to kernel log, while calling aplay or arecoed with alsa plugin, hardware ASRC doesn't be called.

Does iMX yocto BS support fsl-alsa-plugin or not, or how to use it, Thanks!

Re: Dose imx6 yocto BSP including fsl-alsa-plugin?

igorpadykov — Fri, 30 Nov 2018 00:15:49 GMT

Hi arc

hardware asrc is supported in i.mx official nxp bsps described on

i.MX Software|NXP

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: Dose imx6 yocto BSP including fsl-alsa-plugin?

arc_lin — Fri, 30 Nov 2018 03:40:55 GMT

Hi Igor,

Do you know how to enable fsl-alsa-plugin ASRC feature in iMX BSP?

I'am follow the instruction modify /etc/asound.conf

but arecord -vD asrc result shows no ASRC was enabled.

Thanks!

Arc.

Re: Dose imx6 yocto BSP including fsl-alsa-plugin?

igorpadykov — Sat, 01 Dec 2018 03:42:35 GMT

Hi Arc

for asrc usage one can check its driver description in sect.7.2

Asynchronous Sample Rate Converter (ASRC) attached Linux Manual.

Re: Dose imx6 yocto BSP including fsl-alsa-plugin?

arc_lin — Mon, 03 Dec 2018 10:12:43 GMT

Hi Igor,

I am simply copy tmp/sysroots/imx6qsabresd/usr/lib/alsa-lib/ directory from yocto to rootfs, and alsa-plugin executes successfully.

As follows i.MX_Reference_Manual.pdf, unit_tests works fine

"@@ fsl_asrc_ioctl_config_pair " is a printed log make sure ASRC has been called

But while using fsl-alsa-plugin to SPDIF device,

it shows

but without any SPDIF signal output

Should i open another thread for this discussion?

Thanks!
Arc.

Re: Dose imx6 yocto BSP including fsl-alsa-plugin?

youngOne — Thu, 16 Sep 2021 13:23:12 GMT

Hello @igorpadykov

I tried the ~/.asoundrc configuration as mentioned in 7.2.3.2 of attached manual.

But when I do, aplay -l | grep ASRC, it returns blank.

aplay -l , lists only card0, device0.

So what could have gone wrong? How to ensure alsa resampling by ASRC?

Further info on my imx6 yocto:

1. snd-soc-fsl-asrc kernel module is loaded

2. /dev/mxc_asrc exists

3. /proc/driver/asrc doesn't exist

4. cat /proc/asound/cards lists only card0

Thanks!