From ba6e4b997181497e51419fad2b73d229bffa1787 Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Mon, 4 Dec 2023 12:47:36 +0000 Subject: [PATCH] ASoC: qcom: sc8280xp: Limit speaker digital volumes 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 Reviewed-by: Johan Hovold Tested-by: Johan Hovold Link: https://lore.kernel.org/r/20231204124736.132185-3-srinivas.kandagatla@linaro.org Signed-off-by: Mark Brown [ johan: backport to 6.6; rename snd_soc_rtd_to_cpu() ] Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- sound/soc/qcom/sc8280xp.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/sound/soc/qcom/sc8280xp.c b/sound/soc/qcom/sc8280xp.c index 14d9fea..c61cad0 100644 --- 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 = asoc_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); } -- 2.7.4