ASoC: Allow mulitple usage count of codec and cpu dai

If we are to have a snd_soc_dai i.e, cpu_dai and codec_dai, shared among two
or more dai_links we need to log the number of active users of the dai.
For that, we change semantics of the snd_soc_dai.active flag from indicator
to reference counter.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 19 insertions, 14 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 27a2ad9a6b8b..f792c1881b0a 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -375,7 +375,7 @@ struct snd_soc_pcm_stream {
         unsigned int rate_max;          /* max rate */
         unsigned int channels_min;      /* min channels */
         unsigned int channels_max;      /* max channels */
-        unsigned int active:1;          /* stream is in use */
+        unsigned int active;            /* num of active users of the stream */
 };
 
 /* SoC audio ops */
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 1215a0ec2df0..f30959cc954a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -454,11 +454,15 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
         pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
                  runtime->hw.rate_max);
 
-        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-                cpu_dai->playback.active = codec_dai->playback.active = 1;
-        else
-                cpu_dai->capture.active = codec_dai->capture.active = 1;
-        cpu_dai->active = codec_dai->active = 1;
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                cpu_dai->playback.active++;
+                codec_dai->playback.active++;
+        } else {
+                cpu_dai->capture.active++;
+                codec_dai->capture.active++;
+        }
+        cpu_dai->active++;
+        codec_dai->active++;
         card->codec->active++;
         mutex_unlock(&pcm_mutex);
         return 0;
@@ -530,15 +534,16 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
 
         mutex_lock(&pcm_mutex);
 
-        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-                cpu_dai->playback.active = codec_dai->playback.active = 0;
-        else
-                cpu_dai->capture.active = codec_dai->capture.active = 0;
-
-        if (codec_dai->playback.active == 0 &&
-                codec_dai->capture.active == 0) {
-                cpu_dai->active = codec_dai->active = 0;
+        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+                cpu_dai->playback.active--;
+                codec_dai->playback.active--;
+        } else {
+                cpu_dai->capture.active--;
+                codec_dai->capture.active--;
         }
+
+        cpu_dai->active--;
+        codec_dai->active--;
         codec->active--;
 
         /* Muting the DAC suppresses artifacts caused during digital