From 02b44a2b2bdcee03cbb92484d31e9ca1b91b2a38 Mon Sep 17 00:00:00 2001 From: Stefan Binding Date: Wed, 30 Apr 2025 11:31:19 +0100 Subject: [PATCH 1/2] ASoC: intel/sdw_utils: Add volume limit to cs42l43 speakers The volume control for cs42l43 speakers has a maximum gain of +31.5 dB. However, for many use cases, this can cause distorted audio, depending various factors, such as other signal-processing elements in the chain, for example if the audio passes through a gain control before reaching the codec or the signal path has been tuned for a particular maximum gain in the codec. In the case of systems which use the soc_sdw_cs42l43 driver, audio will likely be distorted in all cases above 0 dB, therefore add a volume limit of 128, which is 0 dB maximum volume inside this driver. Signed-off-by: Stefan Binding Reviewed-by: Charles Keepax Link: https://patch.msgid.link/20250430103134.24579-2-sbinding@opensource.cirrus.com Signed-off-by: Mark Brown --- sound/soc/sdw_utils/soc_sdw_cs42l43.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/soc/sdw_utils/soc_sdw_cs42l43.c b/sound/soc/sdw_utils/soc_sdw_cs42l43.c index 668c9d28a1c1..b415d45d520d 100644 --- a/sound/soc/sdw_utils/soc_sdw_cs42l43.c +++ b/sound/soc/sdw_utils/soc_sdw_cs42l43.c @@ -20,6 +20,8 @@ #include #include +#define CS42L43_SPK_VOLUME_0DB 128 /* 0dB Max */ + static const struct snd_soc_dapm_route cs42l43_hs_map[] = { { "Headphone", NULL, "cs42l43 AMP3_OUT" }, { "Headphone", NULL, "cs42l43 AMP4_OUT" }, @@ -117,6 +119,14 @@ int asoc_sdw_cs42l43_spk_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_so return -ENOMEM; } + ret = snd_soc_limit_volume(card, "cs42l43 Speaker Digital Volume", + CS42L43_SPK_VOLUME_0DB); + if (ret) + dev_err(card->dev, "cs42l43 speaker volume limit failed: %d\n", ret); + else + dev_info(card->dev, "Setting CS42L43 Speaker volume limit to %d\n", + CS42L43_SPK_VOLUME_0DB); + ret = snd_soc_dapm_add_routes(&card->dapm, cs42l43_spk_map, ARRAY_SIZE(cs42l43_spk_map)); if (ret) From d5463e531c128ff1b141fdba2e13345cd50028a4 Mon Sep 17 00:00:00 2001 From: Stefan Binding Date: Wed, 30 Apr 2025 11:31:20 +0100 Subject: [PATCH 2/2] ASoC: intel/sdw_utils: Add volume limit to cs35l56 speakers The volume control for cs35l56 speakers has a maximum gain of +12 dB. However, for many use cases, this can cause distorted audio, depending various factors, such as other signal-processing elements in the chain, for example if the audio passes through a gain control before reaching the amp or the signal path has been tuned for a particular maximum gain in the amp. In the case of systems which use the soc_sdw_* driver, audio will likely be distorted in all cases above 0 dB, therefore add a volume limit of 400, which is 0 dB maximum volume inside this driver. The volume limit should be applied to both soundwire and soundwire bridge configurations. Signed-off-by: Stefan Binding Link: https://patch.msgid.link/20250430103134.24579-3-sbinding@opensource.cirrus.com Signed-off-by: Mark Brown --- include/sound/soc_sdw_utils.h | 1 + sound/soc/sdw_utils/soc_sdw_bridge_cs35l56.c | 4 ++++ sound/soc/sdw_utils/soc_sdw_cs_amp.c | 24 ++++++++++++++++++++ 3 files changed, 29 insertions(+) diff --git a/include/sound/soc_sdw_utils.h b/include/sound/soc_sdw_utils.h index 36a4a1e1d8ca..d8bd5d37131a 100644 --- a/include/sound/soc_sdw_utils.h +++ b/include/sound/soc_sdw_utils.h @@ -226,6 +226,7 @@ int asoc_sdw_cs_amp_init(struct snd_soc_card *card, bool playback); int asoc_sdw_cs_spk_feedback_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai *dai); +int asoc_sdw_cs35l56_volume_limit(struct snd_soc_card *card, const char *name_prefix); /* MAXIM codec support */ int asoc_sdw_maxim_init(struct snd_soc_card *card, diff --git a/sound/soc/sdw_utils/soc_sdw_bridge_cs35l56.c b/sound/soc/sdw_utils/soc_sdw_bridge_cs35l56.c index 246e5c2e0af5..c7e55f443351 100644 --- a/sound/soc/sdw_utils/soc_sdw_bridge_cs35l56.c +++ b/sound/soc/sdw_utils/soc_sdw_bridge_cs35l56.c @@ -60,6 +60,10 @@ static int asoc_sdw_bridge_cs35l56_asp_init(struct snd_soc_pcm_runtime *rtd) /* 4 x 16-bit sample slots and FSYNC=48000, BCLK=3.072 MHz */ for_each_rtd_codec_dais(rtd, i, codec_dai) { + ret = asoc_sdw_cs35l56_volume_limit(card, codec_dai->component->name_prefix); + if (ret) + return ret; + ret = snd_soc_dai_set_tdm_slot(codec_dai, tx_mask, rx_mask, 4, 16); if (ret < 0) return ret; diff --git a/sound/soc/sdw_utils/soc_sdw_cs_amp.c b/sound/soc/sdw_utils/soc_sdw_cs_amp.c index 4b6181cf2971..35b550bcd4de 100644 --- a/sound/soc/sdw_utils/soc_sdw_cs_amp.c +++ b/sound/soc/sdw_utils/soc_sdw_cs_amp.c @@ -16,6 +16,25 @@ #define CODEC_NAME_SIZE 8 #define CS_AMP_CHANNELS_PER_AMP 4 +#define CS35L56_SPK_VOLUME_0DB 400 /* 0dB Max */ + +int asoc_sdw_cs35l56_volume_limit(struct snd_soc_card *card, const char *name_prefix) +{ + char *volume_ctl_name; + int ret; + + volume_ctl_name = kasprintf(GFP_KERNEL, "%s Speaker Volume", name_prefix); + if (!volume_ctl_name) + return -ENOMEM; + + ret = snd_soc_limit_volume(card, volume_ctl_name, CS35L56_SPK_VOLUME_0DB); + if (ret) + dev_err(card->dev, "%s limit set failed: %d\n", volume_ctl_name, ret); + + kfree(volume_ctl_name); + return ret; +} +EXPORT_SYMBOL_NS(asoc_sdw_cs35l56_volume_limit, "SND_SOC_SDW_UTILS"); int asoc_sdw_cs_spk_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai *dai) { @@ -40,6 +59,11 @@ int asoc_sdw_cs_spk_rtd_init(struct snd_soc_pcm_runtime *rtd, struct snd_soc_dai snprintf(widget_name, sizeof(widget_name), "%s SPK", codec_dai->component->name_prefix); + + ret = asoc_sdw_cs35l56_volume_limit(card, codec_dai->component->name_prefix); + if (ret) + return ret; + ret = snd_soc_dapm_add_routes(&card->dapm, &route, 1); if (ret) return ret;