[alsa-devel] Fwd: Issue on Linux 4.12-rc7 on iMX6 based board

[Fabio Estevam]

Hi Gianluca,

On Wed, Jun 28, 2017 at 12:34 PM, gianluca
<gianlucarenzi at eurekelettronica.it> wrote:

> Hello list,
>
> I have some issue using the sgtl5000 on two custom boards based with iMX6.
> One board has iMX6DL and the other has iMX6QP.
>
> The issue is I have a (dramatically high) strange value on mixer settings
> (looks like a int32 limit or similar)
>
> This is the output of amixer:
>>
>> # amixer
>> Simple mixer control 'Headphone',0
>>   Capabilities: pvolume pswitch pswitch-joined
>>   Playback channels: Front Left - Front Right
>>   Limits: Playback 0 - 127
>>   Mono:
>>   Front Left: Playback 0 [2147483647%] [-51.50dB] [on]
>>   Front Right: Playback 0 [2147483647%] [-51.50dB] [on]

Double check the codec hardware: is I2C communication working, are you
able to dump the SGTL5000 registers, check the codec power supplies,
MCLK, etc.