File 0001-sof-soundwire-third-fix-for-multi-codec.patch of Package alsa-ucm-conf

From d57d800c6a5a77e6c475719b0297bebb098f7533 Mon Sep 17 00:00:00 2001
From: Maciej Strozek <mstrozek@opensource.cirrus.com>
Date: Tue, 9 Dec 2025 13:00:44 +0000
Subject: [PATCH 1/3] sof-soundwire: third fix for multi-codec

Ensure MultiCodec-based actions are only done when MultiCodec1 is not empty

Closes: https://github.com/alsa-project/alsa-ucm-conf/pull/658
Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 ucm2/sof-soundwire/sof-soundwire.conf | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/ucm2/sof-soundwire/sof-soundwire.conf b/ucm2/sof-soundwire/sof-soundwire.conf
index 7f9c7dcf0d8d..895f479933f4 100644
--- a/ucm2/sof-soundwire/sof-soundwire.conf
+++ b/ucm2/sof-soundwire/sof-soundwire.conf
@@ -72,8 +72,9 @@ If.multi_init {
 If.multi_speaker {
 	Condition {
 		Type RegexMatch
-		Regex "(${var:MultiCodec1}(-sdca)?)"
-		String "${var:SpeakerCodec1}"
+		# guard with "=" to avoid empty string matching
+		Regex "=(${var:MultiCodec1}(-sdca)?)="
+		String "=${var:SpeakerCodec1}="
 	}
 	True {
 		Define.SpeakerCodec1 ""
@@ -83,8 +84,9 @@ If.multi_speaker {
 If.multi_mic {
 	Condition {
 		Type RegexMatch
-		Regex "(${var:MultiCodec1}(-sdca)?)"
-		String "${var:MicCodec1}"
+		# guard with "=" to avoid empty string matching
+		Regex "=(${var:MultiCodec1}(-sdca)?)="
+		String "=${var:MicCodec1}="
 	}
 	True {
 		Define.MicCodec1 ""
@@ -94,8 +96,9 @@ If.multi_mic {
 If.multi_headset {
 	Condition {
 		Type RegexMatch
-		Regex "(${var:MultiCodec1}(-sdca)?)"
-		String "${var:HeadsetCodec1}"
+		# guard with "=" to avoid empty string matching
+		Regex "=(${var:MultiCodec1}(-sdca)?)="
+		String "=${var:HeadsetCodec1}="
 	}
 	True {
 		Define.HeadsetCodec1 ""
-- 
2.52.0