wm8962 0-001a: ASoC: error at soc_component_read_no_lock on wm8962.0-001a: -16

[Wang, Xiaolei]

On 9/29/2022 5:24 PM, Charles Keepax wrote:
> [Please note: This e-mail is from an EXTERNAL e-mail address]
>
> On Wed, Sep 28, 2022 at 02:44:30AM +0000, Wang, Xiaolei wrote:
>> Hi Jaroslav
>>
>> When I tested the audio, I found that some registers in the
>> codec of wm8962.c will fail to read in the mainline kernel. I
>> found that wm8962_i2c_probe will enter runtime suspend after
>> startup, but in the following program:
>>
>> snd_soc_bind_card
>>       snd_soc_dapm_new_widgets
>>           soc_dapm_read
>>               snd_soc_component_read(dapm->component, reg);
>>
>> There is no runtime resume, which cannot perform normal
>> reading and writing for volatile reg, because it has been
>> switched to regcache only in the process of runtime suspend. I
>> can't find the right place to resume, can you give me any
>> advice?
>>
> I think the first step would be could you clarify which register
> is being read here? Reading a volatile register as part of
> setting up the widgets does feel rather problematic.

Yes, this is reading the 0x30 register of the wm8962, it can adjust 
Microphone Bias Voltage.

thanks

xiaolei

>
> Thanks,
> Charles