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[yocto]SGTL5000: Restart SGTL5000- card registration fails

Question asked by Joel Munoz on May 9, 2017
Latest reply on May 10, 2017 by Joel Munoz

Dears members

 

I have a Wandboard platform (which has an SGTL5000 audio codec) running a Linux image (Linux wandboard 3.14.28_1.0.0_ga-wandboard). While I use this platform with headphones

<WANDBOARD/LINEOUT> ------> <HEADPHONES>

it works OK.

 

On the other side, when I used a little amplifier LM386

<WANDBOARD/LINEOUT>-------> <resistor><LM386><SPEAKER>

-------------------------                          -------------------------------------------

POWER SOURCE 1                              POWER SOURCE 2 (Both grounds are connected)

, it works fine. However, after some minutes, it stop working. In order to recover it, I rebooted the system, but without any success.  In addition, once the reboot was finished, the "dmesg" command returned the following lines

 

[ 5.491631] imx-sgtl5000 sound.20: ASoC: CODEC (null) not registered
[ 5.496951] imx-sgtl5000 sound.20: snd_soc_register_card failed (-517)
[ 5.502196] platform sound.20: Driver imx-sgtl5000 requests probe deferra

 

The only way I found to restart the system is power-cycling the board.

 

Do you know any way I have to follow in order to recover the IC without need power-cycling the board? In addition, which circuit recommendation do you suggest?

 

Thank you very much for your help and support.

 

Regards

Joel

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