1 files changed, 54 insertions, 0 deletions

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index b07d8d68a939..4199498a8918 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -122,6 +122,9 @@ struct twl4030_priv {
         unsigned int bypass_state;
         unsigned int codec_powered;
         unsigned int codec_muted;
+
+        struct snd_pcm_substream *master_substream;
+        struct snd_pcm_substream *slave_substream;
 };
 
 /*
@@ -1217,6 +1220,50 @@ static int twl4030_set_bias_level(struct snd_soc_codec *codec,
         return 0;
 }
 
+static int twl4030_startup(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        struct twl4030_priv *twl4030 = codec->private_data;
+
+        /* If we already have a playback or capture going then constrain
+         * this substream to match it.
+         */
+        if (twl4030->master_substream) {
+                struct snd_pcm_runtime *master_runtime;
+                master_runtime = twl4030->master_substream->runtime;
+
+                snd_pcm_hw_constraint_minmax(substream->runtime,
+                                             SNDRV_PCM_HW_PARAM_RATE,
+                                             master_runtime->rate,
+                                             master_runtime->rate);
+
+                snd_pcm_hw_constraint_minmax(substream->runtime,
+                                             SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
+                                             master_runtime->sample_bits,
+                                             master_runtime->sample_bits);
+
+                twl4030->slave_substream = substream;
+        } else
+                twl4030->master_substream = substream;
+
+        return 0;
+}
+
+static void twl4030_shutdown(struct snd_pcm_substream *substream)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->codec;
+        struct twl4030_priv *twl4030 = codec->private_data;
+
+        if (twl4030->master_substream == substream)
+                twl4030->master_substream = twl4030->slave_substream;
+
+        twl4030->slave_substream = NULL;
+}
+
 static int twl4030_hw_params(struct snd_pcm_substream *substream,
                            struct snd_pcm_hw_params *params,
                            struct snd_soc_dai *dai)
@@ -1224,8 +1271,13 @@ static int twl4030_hw_params(struct snd_pcm_substream *substream,
         struct snd_soc_pcm_runtime *rtd = substream->private_data;
         struct snd_soc_device *socdev = rtd->socdev;
         struct snd_soc_codec *codec = socdev->card->codec;
+        struct twl4030_priv *twl4030 = codec->private_data;
         u8 mode, old_mode, format, old_format;
 
+        if (substream == twl4030->slave_substream)
+                /* Ignoring hw_params for slave substream */
+                return 0;
+
         /* bit rate */
         old_mode = twl4030_read_reg_cache(codec,
                         TWL4030_REG_CODEC_MODE) & ~TWL4030_CODECPDZ;
@@ -1384,6 +1436,8 @@ static int twl4030_set_dai_fmt(struct snd_soc_dai *codec_dai,
 #define TWL4030_FORMATS  (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FORMAT_S24_LE)
 
 static struct snd_soc_dai_ops twl4030_dai_ops = {
+        .startup        = twl4030_startup,
+        .shutdown       = twl4030_shutdown,
         .hw_params      = twl4030_hw_params,
         .set_sysclk     = twl4030_set_dai_sysclk,
         .set_fmt        = twl4030_set_dai_fmt,