ASoC: qcom: sc8280xp: limit speaker volumes

The UCM configuration for the Lenovo ThinkPad X13s has up until now
been setting the speaker PA volume to the minimum -3 dB when enabling
the speakers, but this does not prevent the user from increasing the
volume further.

Limit the digital gain and PA volumes to a combined -3 dB in the machine
driver to reduce the risk of speaker damage until we have active speaker
protection in place (or higher safe levels have been established).

Note that the PA volume limit cannot be set lower than 0 dB or
PulseAudio gets confused when the first 16 levels all map to -3 dB.

Also note that this will probably need to be generalised using
machine-specific limits, but a common limit should do for now.

Cc:  <stable@vger.kernel.org>	# 6.5
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://msgid.link/r/20240122181819.4038-3-johan+linaro@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c
index ed4bb551bfbb92c965eba25c048ce4fa12648283..b7fd503a166668d3fe41500bf52e58de129c92de 100644 (file)
--- a/sound/soc/qcom/sc8280xp.c
+++ b/sound/soc/qcom/sc8280xp.c
@@ -32,12 +32,14 @@ static int sc8280xp_snd_init(struct snd_soc_pcm_runtime *rtd)
        case WSA_CODEC_DMA_RX_0:
        case WSA_CODEC_DMA_RX_1:
                /*
-                * set limit of 0dB on Digital Volume for Speakers,
-                * this can prevent damage of speakers to some extent without
-                * active speaker protection
+                * Set limit of -3 dB on Digital Volume and 0 dB on PA Volume
+                * to reduce the risk of speaker damage until we have active
+                * speaker protection in place.
                 */
-               snd_soc_limit_volume(card, "WSA_RX0 Digital Volume", 84);
-               snd_soc_limit_volume(card, "WSA_RX1 Digital Volume", 84);
+               snd_soc_limit_volume(card, "WSA_RX0 Digital Volume", 81);
+               snd_soc_limit_volume(card, "WSA_RX1 Digital Volume", 81);
+               snd_soc_limit_volume(card, "SpkrLeft PA Volume", 17);
+               snd_soc_limit_volume(card, "SpkrRight PA Volume", 17);
                break;
        default:
                break;