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Date: Tue, 16 Jan 2024 15:10:08 +0000
From: Mark Brown <broonie@kernel.org>
To: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Johan Hovold <johan+linaro@kernel.org>,
	Banajit Goswami <bgoswami@quicinc.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	alsa-devel@alsa-project.org, linux-sound@vger.kernel.org,
	linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH 1/7] ASoC: qcom: sc8280xp: limit speaker volumes
Message-ID: <029c8d1b-a621-41cb-a577-dd5829fe8427@sirena.org.uk>
References: <20240116093903.19403-1-johan+linaro@kernel.org>
 <20240116093903.19403-2-johan+linaro@kernel.org>
 <1cc50979-741b-4341-9e9e-2fdee1dd2e65@linaro.org>
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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.
> >=20
> > 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 inplac=
e.

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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