ASoC: core - PCM mutex per rtd

In preparation for the new ASoC Dynamic PCM support (AKA DSP support).

The new ASoC Dynamic PCM core allows DAIs to be dynamically re-routed
at runtime between the PCM device end (or Frontend - FE) and the physical DAI
(Backend - BE) using regular kcontrols (just like a hardware CODEC routes
audio in the analog domain). The Dynamic PCM core therefore must be
able to call PCM operations for both the Frontend and Backend(s) DAIs at
the same time.

Currently we have a global pcm_mutex that is used to serialise
the ASoC PCM operations. This patch removes the global mutex
and adds a mutex per RTD allowing the PCM operations to be reentrant and
allow control of more than one DAI at at time. e.g. a frontend PCM hw_params()
could configure multiple backend DAI hw_params() with similar or different
hw parameters at the same time.

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 15 insertions, 14 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 32d7d2f8147c..32bc50387f61 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1032,6 +1032,7 @@ static int soc_post_component_init(struct snd_soc_card *card,
 	rtd->dev.parent = card->dev;
 	rtd->dev.release = rtd_release;
 	rtd->dev.init_name = name;
+	mutex_init(&rtd->pcm_mutex);
 	ret = device_register(&rtd->dev);
 	if (ret < 0) {
 		dev_err(card->dev,
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 9bebee82bc15..f4864b088d2c 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -81,7 +81,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 	struct snd_soc_dai_driver *codec_dai_drv = codec_dai->driver;
 	int ret = 0;
 
-	mutex_lock(&pcm_mutex);
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	/* startup the audio subsystem */
 	if (cpu_dai->driver->ops->startup) {
@@ -211,7 +211,7 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 	cpu_dai->active++;
 	codec_dai->active++;
 	rtd->codec->active++;
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return 0;
 
 config_err:
@@ -230,7 +230,7 @@ platform_err:
 	if (cpu_dai->driver->ops->shutdown)
 		cpu_dai->driver->ops->shutdown(substream, cpu_dai);
 out:
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }
 
@@ -245,7 +245,7 @@ static void close_delayed_work(struct work_struct *work)
 			container_of(work, struct snd_soc_pcm_runtime, delayed_work.work);
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 
-	mutex_lock(&pcm_mutex);
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	pr_debug("pop wq checking: %s status: %s waiting: %s\n",
 		 codec_dai->driver->playback.stream_name,
@@ -260,7 +260,7 @@ static void close_delayed_work(struct work_struct *work)
 			SND_SOC_DAPM_STREAM_STOP);
 	}
 
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 }
 
 /*
@@ -276,7 +276,7 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = rtd->codec;
 
-	mutex_lock(&pcm_mutex);
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		cpu_dai->playback_active--;
@@ -321,7 +321,7 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
 			SND_SOC_DAPM_STREAM_STOP);
 	}
 
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return 0;
 }
 
@@ -338,7 +338,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret = 0;
 
-	mutex_lock(&pcm_mutex);
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	if (rtd->dai_link->ops && rtd->dai_link->ops->prepare) {
 		ret = rtd->dai_link->ops->prepare(substream);
@@ -391,7 +391,7 @@ static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 	snd_soc_dai_digital_mute(codec_dai, 0);
 
 out:
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }
 
@@ -409,7 +409,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	int ret = 0;
 
-	mutex_lock(&pcm_mutex);
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_params) {
 		ret = rtd->dai_link->ops->hw_params(substream, params);
@@ -449,7 +449,7 @@ static int soc_pcm_hw_params(struct snd_pcm_substream *substream,
 	rtd->rate = params_rate(params);
 
 out:
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 
 platform_err:
@@ -464,7 +464,7 @@ codec_err:
 	if (rtd->dai_link->ops && rtd->dai_link->ops->hw_free)
 		rtd->dai_link->ops->hw_free(substream);
 
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return ret;
 }
 
@@ -479,7 +479,7 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_codec *codec = rtd->codec;
 
-	mutex_lock(&pcm_mutex);
+	mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
 
 	/* apply codec digital mute */
 	if (!codec->active)
@@ -500,7 +500,7 @@ static int soc_pcm_hw_free(struct snd_pcm_substream *substream)
 	if (cpu_dai->driver->ops->hw_free)
 		cpu_dai->driver->ops->hw_free(substream, cpu_dai);
 
-	mutex_unlock(&pcm_mutex);
+	mutex_unlock(&rtd->pcm_mutex);
 	return 0;
 }