ASoC: ssm2602: Fix priv substreams refs

Clean up our record of the active streams in shutdown(), fixing
subsequent failures of snd_pcm_hw_constraints_complete after closure of
a stream.

NOTE:
- The ssm2602 allows pairs of non-matching PB/REC rates.
- This is a fix for less evil:
  The logic is flawed (e.g. the slave might startup before the
  master's rate and sample_bits are set).

Signed-off-by: Karl Beldan <karl.beldan@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/sound/soc/codecs/ssm2602.c b/sound/soc/codecs/ssm2602.c
index 44ef0dacd564..0e522e718dfc 100644
--- a/sound/soc/codecs/ssm2602.c
+++ b/sound/soc/codecs/ssm2602.c
@@ -292,9 +292,15 @@ static int ssm2602_hw_params(struct snd_pcm_substream *substream,
         struct snd_soc_device *socdev = rtd->socdev;
         struct snd_soc_codec *codec = socdev->codec;
         struct ssm2602_priv *ssm2602 = codec->private_data;
+        struct i2c_client *i2c = codec->control_data;
         u16 iface = ssm2602_read_reg_cache(codec, SSM2602_IFACE) & 0xfff3;
         int i = get_coeff(ssm2602->sysclk, params_rate(params));
 
+        if (substream == ssm2602->slave_substream) {
+                dev_dbg(&i2c->dev, "Ignoring hw_params for slave substream\n");
+                return 0;
+        }
+
         /*no match is found*/
         if (i == ARRAY_SIZE(coeff_div))
                 return -EINVAL;
@@ -330,13 +336,19 @@ static int ssm2602_startup(struct snd_pcm_substream *substream)
         struct snd_soc_device *socdev = rtd->socdev;
         struct snd_soc_codec *codec = socdev->codec;
         struct ssm2602_priv *ssm2602 = codec->private_data;
+        struct i2c_client *i2c = codec->control_data;
         struct snd_pcm_runtime *master_runtime;
 
         /* The DAI has shared clocks so if we already have a playback or
          * capture going then constrain this substream to match it.
+         * TODO: the ssm2602 allows pairs of non-matching PB/REC rates
          */
         if (ssm2602->master_substream) {
                 master_runtime = ssm2602->master_substream->runtime;
+                dev_dbg(&i2c->dev, "Constraining to %d bits at %dHz\n",
+                        master_runtime->sample_bits,
+                        master_runtime->rate);
+
                 snd_pcm_hw_constraint_minmax(substream->runtime,
                                              SNDRV_PCM_HW_PARAM_RATE,
                                              master_runtime->rate,
@@ -370,9 +382,15 @@ static void ssm2602_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 ssm2602_priv *ssm2602 = codec->private_data;
         /* deactivate */
         if (!codec->active)
                 ssm2602_write(codec, SSM2602_ACTIVE, 0);
+
+        if (ssm2602->master_substream == substream)
+                ssm2602->master_substream = ssm2602->slave_substream;
+
+        ssm2602->slave_substream = NULL;
 }
 
 static int ssm2602_mute(struct snd_soc_dai *dai, int mute)