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authorJohan Hovold <johan+linaro@kernel.org>2024-01-22 19:18:17 +0100
committerMark Brown <broonie@kernel.org>2024-01-22 19:38:10 +0000
commitc481016bb4f8a9c059c39ac06e7b65e233a61f6a (patch)
tree9f201461d10768620bf209d7be53d6c7ec61e739 /sound
parent92c02d74ba7b7cdf3887ed56bc9af38c3ee17a8b (diff)
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>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/qcom/sc8280xp.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c
index ed4bb551bfbb..b7fd503a1666 100644
--- 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;