[alsa-devel] [PATCH 2/4] ASoC: tlv320aic31xx: Add overflow detection support

[Andrew F. Davis]

On 09/03/2018 08:03 AM, Mark Brown wrote:
> On Fri, Aug 31, 2018 at 01:24:32PM -0500, Andrew F. Davis wrote:
>> Similar to short circuit detection, when the ADC/DAC is saturated and
>> overflows poor audio quality can result and should be reported to the
>> user. This device support Automatic Dynamic Range Compression (DRC)
>> to reduce this but it is not enabled currently in this driver.
> 
>> +	if (value & AIC31XX_DAC_OF_LEFT)
>> +		dev_err(dev, "Left-channel DAC overflow has occurred\n");
>> +	if (value & AIC31XX_DAC_OF_RIGHT)
>> +		dev_err(dev, "Right-channel DAC overflow has occurred\n");
> 
> So, this will sound terrible but I'm not sure that unconditionally
> shouting in the logs is the right thing to do here - people do sometimes
> put non-audio signals through sound cards (using them as generic DACs
> and ADCs) and it seems like it could get very spammy.  Perhaps a lower
> level warning message, some counters or even some control that allows
> the warnings to be masked.
> 

As these events do not stop the function of the sound card, I agree
warnings would be more appropriate than errors, I'll make that change.

Andrew