i.MX ProcessorsのトピックRe: i.mx6Q audio codec wm8962 sometimes failed to play

i.mx6Q audio codec wm8962 sometimes failed to play

wallyyeh — Thu, 12 Jun 2014 05:48:33 GMT

Hi, our product is using base on SDK_3.0.35-4.1.0_GA, audio codec is the same as i.mx6Q SabrdSD board(wm8962 but without PMIC)

Recently, our customer complain about our i.mx6Q product sometimes can't play or record sound.

and I only got one line error message: "wm8962 0-001a: DC servo timed out"

When this issue happen, aplay or arecord will just stuck, 'till press ctrl+c to interrupt the paly/record process.

and after the interruption done, aplay/arecord once again working fine.

I search the entire community about keyword "wm8962", and found nothing useful. could some one give me a hint or suggestion what I should check?

p.s: in order to using alsamixer, there is a /etc/asound.conf:

/********************************************************************/

defaults.pcm.rate_converter "linear"

pcm.dmix_48000 {

type dmix

ipc_key 5778292

ipc_key_add_uid false

ipc_perm 0666

slave {

pcm "hw:0,0"

period_time 10000

buffer_time 512000

format S16_LE

rate 48000

}

pcm.dsnoop_48000 {

type dsnoop

ipc_key 5778293

ipc_key_add_uid false

ipc_perm 0666

slave{

pcm "hw:0,0"

period_time 10000

buffer_time 512000

format S16_LE

rate 48000

}

pcm.asymed {

type asym

playback.pcm "dmix_48000"

capture.pcm "dsnoop_48000"

}

pcm.dsp0 {

type plug

slave.pcm "asymed"

}

pcm.!default {

type plug

route_policy "average"

slave.pcm "asymed"

}

ctl.dmixer {

type hw

card 0

}

/********************************************************************/

not sure is this file related to this issue.

Re: i.mx6Q audio codec wm8962 sometimes failed to play

igorpadykov — Fri, 13 Jun 2014 02:35:26 GMT

Hi Wally

this issue and wm8962 error is well known (see link below)

and caused by power-up issues. So it make sense check board power-up

sequence.

http://comments.gmane.org/gmane.linux.alsa.devel/109219

Best regards

chip

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Re: i.mx6Q audio codec wm8962 sometimes failed to play

wallyyeh — Fri, 13 Jun 2014 03:09:09 GMT

Hi, chipexpert:

thanks for reply, but the patch you post seems like for SDK_3.10.17? our product is for sale now, and it is based on old SDK_3.0.35_4.1.0_GA.

In the kernel-3.0.35/sound/soc/codecs/wm8962.c, there's no function named "wm8962_runtime_resume", could you suggest me which part should modification ?

Wally

Re: i.mx6Q audio codec wm8962 sometimes failed to play

igorpadykov — Fri, 13 Jun 2014 03:39:52 GMT

Hi Wally

Please post this to meta-fsl-arm mailing list, so that someone familiar with wm8962 could try to assist you.

https://lists.yoctoproject.org/listinfo/meta-freescale

Best regards

chip

Re: Re: i.mx6Q audio codec wm8962 sometimes failed to play

wallyyeh — Thu, 03 Jul 2014 06:52:08 GMT

After a lot of code review and try, I merge some code from linux-3.0.101 and 3.10.17-GA. now the sound works fine.

the patches file is in attach, hope this will be helpful for someone who stick to SDK_3.0.35_4.1.0-GA.