@@ -101,6 +101,8 @@ struct snd_soc_dpcm_runtime {
/* state and update */
enum snd_soc_dpcm_update runtime_update;
enum snd_soc_dpcm_state state;
+
+ int trigger_pending; /* trigger cmd + 1 if pending, 0 if not */
};
/* can this BE stop and free */
@@ -1155,13 +1155,36 @@ static void dpcm_set_fe_runtime(struct snd_pcm_substream *substream)
}
}
+static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd);
+
+/* Set FE's runtime_update state; the state is protected via PCM stream lock
+ * for avoiding the race with trigger callback.
+ * If the state is unset and a trigger is pending while the previous operation,
+ * process the pending trigger action here.
+ */
+static void dpcm_set_fe_update_state(struct snd_soc_pcm_runtime *fe,
+ int stream, enum snd_soc_dpcm_update state)
+{
+ struct snd_pcm_substream *substream =
+ snd_soc_dpcm_get_substream(fe, stream);
+
+ snd_pcm_stream_lock_irq(substream);
+ if (state == SND_SOC_DPCM_UPDATE_NO && fe->dpcm[stream].trigger_pending) {
+ dpcm_fe_dai_do_trigger(substream,
+ fe->dpcm[stream].trigger_pending - 1);
+ fe->dpcm[stream].trigger_pending = 0;
+ }
+ fe->dpcm[stream].runtime_update = state;
+ snd_pcm_stream_unlock_irq(substream);
+}
+
static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
{
struct snd_soc_pcm_runtime *fe = fe_substream->private_data;
struct snd_pcm_runtime *runtime = fe_substream->runtime;
int stream = fe_substream->stream, ret = 0;
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
ret = dpcm_be_dai_startup(fe, fe_substream->stream);
if (ret < 0) {
@@ -1183,13 +1206,13 @@ static int dpcm_fe_dai_startup(struct snd_pcm_substream *fe_substream)
dpcm_set_fe_runtime(fe_substream);
snd_pcm_limit_hw_rates(runtime);
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
return 0;
unwind:
dpcm_be_dai_startup_unwind(fe, fe_substream->stream);
be_err:
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
return ret;
}
@@ -1236,7 +1259,7 @@ static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
struct snd_soc_pcm_runtime *fe = substream->private_data;
int stream = substream->stream;
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
/* shutdown the BEs */
dpcm_be_dai_shutdown(fe, substream->stream);
@@ -1250,7 +1273,7 @@ static int dpcm_fe_dai_shutdown(struct snd_pcm_substream *substream)
dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_STOP);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_CLOSE;
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
return 0;
}
@@ -1298,7 +1321,7 @@ static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
int err, stream = substream->stream;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
dev_dbg(fe->dev, "ASoC: hw_free FE %s\n", fe->dai_link->name);
@@ -1313,7 +1336,7 @@ static int dpcm_fe_dai_hw_free(struct snd_pcm_substream *substream)
err = dpcm_be_dai_hw_free(fe, stream);
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_FREE;
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
mutex_unlock(&fe->card->mutex);
return 0;
@@ -1406,7 +1429,7 @@ static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
int ret, stream = substream->stream;
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
memcpy(&fe->dpcm[substream->stream].hw_params, params,
sizeof(struct snd_pcm_hw_params));
@@ -1429,7 +1452,7 @@ static int dpcm_fe_dai_hw_params(struct snd_pcm_substream *substream,
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_HW_PARAMS;
out:
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
mutex_unlock(&fe->card->mutex);
return ret;
}
@@ -1543,7 +1566,7 @@ static int dpcm_be_dai_trigger(struct snd_soc_pcm_runtime *fe, int stream,
}
EXPORT_SYMBOL_GPL(dpcm_be_dai_trigger);
-static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
+static int dpcm_fe_dai_do_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *fe = substream->private_data;
int stream = substream->stream, ret;
@@ -1617,6 +1640,23 @@ out:
return ret;
}
+static int dpcm_fe_dai_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_soc_pcm_runtime *fe = substream->private_data;
+ int stream = substream->stream;
+
+ /* if FE's runtime_update is already set, we're in race;
+ * process this trigger later at exit
+ */
+ if (fe->dpcm[stream].runtime_update != SND_SOC_DPCM_UPDATE_NO) {
+ fe->dpcm[stream].trigger_pending = cmd + 1;
+ return 0; /* delayed, assuming it's successful */
+ }
+
+ /* we're alone, let's trigger */
+ return dpcm_fe_dai_do_trigger(substream, cmd);
+}
+
static int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
{
struct snd_soc_dpcm *dpcm;
@@ -1660,7 +1700,7 @@ static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
dev_dbg(fe->dev, "ASoC: prepare FE %s\n", fe->dai_link->name);
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_FE);
/* there is no point preparing this FE if there are no BEs */
if (list_empty(&fe->dpcm[stream].be_clients)) {
@@ -1687,7 +1727,7 @@ static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
out:
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
mutex_unlock(&fe->card->mutex);
return ret;
@@ -1834,11 +1874,11 @@ static int dpcm_run_new_update(struct snd_soc_pcm_runtime *fe, int stream)
{
int ret;
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
ret = dpcm_run_update_startup(fe, stream);
if (ret < 0)
dev_err(fe->dev, "ASoC: failed to startup some BEs\n");
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
return ret;
}
@@ -1847,11 +1887,11 @@ static int dpcm_run_old_update(struct snd_soc_pcm_runtime *fe, int stream)
{
int ret;
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_BE;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_BE);
ret = dpcm_run_update_shutdown(fe, stream);
if (ret < 0)
dev_err(fe->dev, "ASoC: failed to shutdown some BEs\n");
- fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
+ dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
return ret;
}