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[alsa-ucm-conf,2/2] sof-soundwire: cs42l43: Control hardware volume to avoid clipping

Message ID 20250328083619.1262150-2-mstrozek@opensource.cirrus.com
State New
Headers show
Series [alsa-ucm-conf,1/2] sof-soundwire: cs42l43: Drop headset mic from mic mute LED | expand

Commit Message

Maciej Strozek March 28, 2025, 8:36 a.m. UTC 
Hardware volume control in cs42l43 can go up to +31.5dB which can cause audio
degradation. For best results, keep the hardware volume set to 0dB and let
software volume control the output.

Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
---
 ucm2/sof-soundwire/cs42l43-spk.conf | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

--
2.39.5
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Patch

diff --git a/ucm2/sof-soundwire/cs42l43-spk.conf b/ucm2/sof-soundwire/cs42l43-spk.conf
index 693c450b..b2b32e57 100644
--- a/ucm2/sof-soundwire/cs42l43-spk.conf
+++ b/ucm2/sof-soundwire/cs42l43-spk.conf
@@ -1,5 +1,14 @@ 
 # Use case Configuration for sof-soundwire card

+LibraryConfig.remap.Config {
+	ctl.default.map {
+		"name='cs42l43 Speaker Playback Switch'" {
+			"name='cs42l43 Speaker Digital Switch'".vindex.0 0
+			"name='cs42l43 Speaker Digital Switch'".vindex.1 1
+		}
+	}
+}
+
 SectionDevice."Speaker" {
 	Comment "Speaker"

@@ -8,6 +17,7 @@  SectionDevice."Speaker" {
 	]

 	EnableSequence [
+		cset "name='cs42l43 Speaker Digital Volume' 128"
 		cset "name='cs42l43 Speaker L Input 1' 'DP6RX1'"
 		cset "name='cs42l43 Speaker R Input 1' 'DP6RX2'"
 	]
@@ -20,6 +30,7 @@  SectionDevice."Speaker" {
 	Value {
 		PlaybackPriority 100
 		PlaybackPCM "hw:${CardId},2"
-		PlaybackMixerElem "cs42l43 Speaker Digital"
+		PlaybackMixer "default:${CardId}"
+		PlaybackMixerElem "cs42l43 Speaker"
 	}
 }