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

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Date:   Wed, 24 May 2023 14:59:00 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Zhu Ning <zhuning0077@...il.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        David Yang <yangxiaohua@...rest-semi.com>,
        Daniel Drake <drake@...lessm.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, kernel@...labora.com
Subject: Re: [PATCH 1/3] ASoC: es8316: Increment max value for ALC Capture
 Target Volume control

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.

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