target/linux/bcm27xx/patches-4.19/950-0777-sound-soc-only-first-codec-is-master-in-multicodec-s.patch

   1 From 4ca89eb8570cb86314a5a7b55a15d15f53ce5757 Mon Sep 17 00:00:00 2001
   2 From: Johannes Krude <johannes@krude.de>
   3 Date: Sat, 16 Nov 2019 12:41:06 +0100
   4 Subject: [PATCH] sound/soc: only first codec is master in multicodec
   5  setup
   6
   7 When using multiple codecs, at most one codec should generate the master
   8 clock. All codecs except the first are therefore configured for slave
   9 mode.
  10
  11 Signed-off-by: Johannes Krude <johannes@krude.de>
  12 ---
  13  sound/soc/soc-core.c | 9 ++++++++-
  14  1 file changed, 8 insertions(+), 1 deletion(-)
  15
  16 --- a/sound/soc/soc-core.c
  17 +++ b/sound/soc/soc-core.c
  18 @@ -1688,8 +1688,15 @@ int snd_soc_runtime_set_dai_fmt(struct s
  19
  20         for (i = 0; i < rtd->num_codecs; i++) {
  21                 struct snd_soc_dai *codec_dai = codec_dais[i];
  22 +               unsigned int codec_dai_fmt = dai_fmt;
  23
  24 -               ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
  25 +               // there can only be one master when using multiple codecs
  26 +               if (i && (codec_dai_fmt & SND_SOC_DAIFMT_MASTER_MASK)) {
  27 +                       codec_dai_fmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
  28 +                       codec_dai_fmt |= SND_SOC_DAIFMT_CBS_CFS;
  29 +               }
  30 +
  31 +               ret = snd_soc_dai_set_fmt(codec_dai, codec_dai_fmt);
  32                 if (ret != 0 && ret != -ENOTSUPP) {
  33                         dev_warn(codec_dai->dev,
  34                                  "ASoC: Failed to set DAI format: %d\n", ret);