ASoC: soc-compress: Stop running dpcm on free

If the last trigger that the compr device received is a DRAIN then the
DPCM is left in running state (no stop trigger is sent).
Before we execute the free we need to send a STOP trigger to make sure that
both BE and FE is in expected state and prepared for closing.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/soc-compress.c

@@ -207,6 +207,16 @@ static int soc_compr_free_fe(struct snd_compr_stream *cstream)
 	struct snd_soc_dpcm *dpcm;
 	int stream = cstream->direction; /* SND_COMPRESS_xxx is same as SNDRV_PCM_STREAM_xxx */
 
+	/*
+	 * The core will not send a STOP trigger on free if the device is in
+	 * DRAIN state, but we need to stop BE and FE before we can proceed to
+	 * free the stream.
+	 * Run the a STOP trigger if the DPCM state is START (DRAIN is not
+	 * changing the DPCM state).
+	 */
+	if (fe->dpcm[stream].state == SND_SOC_DPCM_STATE_START)
+		cstream->ops->trigger(cstream, SNDRV_PCM_TRIGGER_STOP);
+
 	snd_soc_card_mutex_lock(fe->card);
 
 	snd_soc_dpcm_mutex_lock(fe);