[PATCH 1/3] ASoC: es8316: Increment max value for ALC Capture Target Volume control

[Cristian Ciocaltea]

On 5/24/23 16:59, Mark Brown wrote:
> On Wed, May 24, 2023 at 04:49:37PM +0300, Cristian Ciocaltea wrote:
>> On 5/24/23 13:30, Mark Brown wrote:
> 
>>> Presumably you can check the effects of changing the value?  It seems
>>> plausible that what's written in the code might be accurate and the
>>> higher values might actually change the gain but it'd be better to
>>> check.
> 
>> I haven't noticed a (measurable) change in gain when switching between
>> 10 and 11, but my testing equipment is also not that great. Will try to
>> improve the tests accuracy.
> 
> I'd expect it should be really obvious with a scope if you've got one?
> Testing with something consistent like a sine wave (eg, from
> speaker-test) should also make a 1.5dB difference noticable enough to
> check if there's at least a volume change by ear even if you can't
> specifically quantify it.

Luckily arecord & aplay provide VU meter support (via -V,
--vumeter=TYPE'), so I could easily verify this without using any
additional tools:

 Volume  |  VU meter
---------+----------
-6.0 dB  |  30-31 %
-4.5 dB  |  35-36 %
-3.0 dB  |  42-43 %
-1.5 dB  |  50-51 %
-0.0 dB  |  50-51 %

So it seems the specs are correct, and the problem is the hardware default.

Is there a better approach to handle this than extending the volume range?

Regards,
Cristian