ASoC: Allow machines to ignore pmdown_time per-link

With this flag, each dai_link in machine driver can choose
to ignore pmdown_time during DAPM shut down sequence.

If the ignore_pmdown_time is set, the DAPM for corresponding DAI
will be executed immediately.

Signed-off-by: Ramesh Babu K V <ramesh.babu@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -718,6 +718,9 @@ struct snd_soc_dai_link {
 	/* Symmetry requirements */
 	unsigned int symmetric_rates:1;
 
+	/* pmdown_time is ignored at stop */
+	unsigned int ignore_pmdown_time:1;
+
 	/* codec/machine specific init - e.g. add machine controls */
 	int (*init)(struct snd_soc_pcm_runtime *rtd);
 

sound/soc/soc-pcm.c

@@ -319,7 +319,8 @@ static int soc_pcm_close(struct snd_pcm_substream *substream)
 	cpu_dai->runtime = NULL;
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		if (unlikely(codec->ignore_pmdown_time)) {
+		if (unlikely(codec->ignore_pmdown_time ||
+			rtd->dai_link->ignore_pmdown_time)) {
 			/* powered down playback stream now */
 			snd_soc_dapm_stream_event(rtd,
 				codec_dai->driver->playback.stream_name,