linux-kernel - Re: [PATCH 1/7] ASoC: qcom: sc8280xp: limit speaker volumes

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Message-ID: <029c8d1b-a621-41cb-a577-dd5829fe8427@sirena.org.uk>
Date: Tue, 16 Jan 2024 15:10:08 +0000
From: Mark Brown <broonie@...nel.org>
To: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	Banajit Goswami <bgoswami@...cinc.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	alsa-devel@...a-project.org, linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/7] ASoC: qcom: sc8280xp: limit speaker volumes

On Tue, Jan 16, 2024 at 11:11:47AM +0000, Srinivas Kandagatla wrote:
> On 16/01/2024 09:38, Johan Hovold wrote:
> > The current UCM configuration sets the speaker PA volume to 15 dB when
> > enabling the speakers but this does not prevent the user from increasing
> > the volume further.
> > 
> > Limit the PA volume to 15 dB in the machine driver to reduce the risk of
> > speaker damage until we have active speaker protection in place.

> LGTM, We can get rid of this limit once we have Speaker protection inplace.

There should be a userspace component for speaker protection so you'll
need to limit things when that's not running.

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