This is a note to let you know that I've just added the patch titled
ASoC: qcom: sc8280xp: Limit speaker digital volumes
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-qcom-sc8280xp-limit-speaker-digital-volumes.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 716d4e5373e9d1ae993485ab2e3b893bf7104fb1 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Date: Mon, 4 Dec 2023 12:47:36 +0000
Subject: ASoC: qcom: sc8280xp: Limit speaker digital volumes
From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
commit 716d4e5373e9d1ae993485ab2e3b893bf7104fb1 upstream.
Limit the speaker digital gains to 0dB so that the users will not damage them.
Currently there is a limit in UCM, but this does not stop the user form
changing the digital gains from command line. So limit this in driver
which makes the speakers more safer without active speaker protection in
place.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Reviewed-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Tested-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231204124736.132185-3-srinivas.kandagatla@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/soc/qcom/sc8280xp.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
--- a/sound/soc/qcom/sc8280xp.c
+++ b/sound/soc/qcom/sc8280xp.c
@@ -27,6 +27,23 @@ struct sc8280xp_snd_data {
static int sc8280xp_snd_init(struct snd_soc_pcm_runtime *rtd)
{
struct sc8280xp_snd_data *data = snd_soc_card_get_drvdata(rtd->card);
+ struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+ struct snd_soc_card *card = rtd->card;
+
+ switch (cpu_dai->id) {
+ 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
+ */
+ snd_soc_limit_volume(card, "WSA_RX0 Digital Volume", 84);
+ snd_soc_limit_volume(card, "WSA_RX1 Digital Volume", 84);
+ break;
+ default:
+ break;
+ }
return qcom_snd_wcd_jack_setup(rtd, &data->jack, &data->jack_setup);
}
Patches currently in stable-queue which might be from srinivas.kandagatla@xxxxxxxxxx are
queue-6.6/asoc-qcom-sc8280xp-limit-speaker-digital-volumes.patch
queue-6.6/asoc-ops-add-correct-range-check-for-limiting-volume.patch
