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Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0777-sound-soc-only-first-codec-is-master-in-multicodec-s.patch')
-rw-r--r--target/linux/bcm27xx/patches-4.19/950-0777-sound-soc-only-first-codec-is-master-in-multicodec-s.patch34
1 files changed, 34 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0777-sound-soc-only-first-codec-is-master-in-multicodec-s.patch b/target/linux/bcm27xx/patches-4.19/950-0777-sound-soc-only-first-codec-is-master-in-multicodec-s.patch
new file mode 100644
index 0000000000..dcfbb9dd1a
--- /dev/null
+++ b/target/linux/bcm27xx/patches-4.19/950-0777-sound-soc-only-first-codec-is-master-in-multicodec-s.patch
@@ -0,0 +1,34 @@
+From 4ca89eb8570cb86314a5a7b55a15d15f53ce5757 Mon Sep 17 00:00:00 2001
+From: Johannes Krude <johannes@krude.de>
+Date: Sat, 16 Nov 2019 12:41:06 +0100
+Subject: [PATCH] sound/soc: only first codec is master in multicodec
+ setup
+
+When using multiple codecs, at most one codec should generate the master
+clock. All codecs except the first are therefore configured for slave
+mode.
+
+Signed-off-by: Johannes Krude <johannes@krude.de>
+---
+ sound/soc/soc-core.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+--- a/sound/soc/soc-core.c
++++ b/sound/soc/soc-core.c
+@@ -1688,8 +1688,15 @@ int snd_soc_runtime_set_dai_fmt(struct s
+
+ for (i = 0; i < rtd->num_codecs; i++) {
+ struct snd_soc_dai *codec_dai = codec_dais[i];
++ unsigned int codec_dai_fmt = dai_fmt;
+
+- ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
++ // there can only be one master when using multiple codecs
++ if (i && (codec_dai_fmt & SND_SOC_DAIFMT_MASTER_MASK)) {
++ codec_dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
++ codec_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
++ }
++
++ ret = snd_soc_dai_set_fmt(codec_dai, codec_dai_fmt);
+ if (ret != 0 && ret != -ENOTSUPP) {
+ dev_warn(codec_dai->dev,
+ "ASoC: Failed to set DAI format: %d\n", ret);