ALSA: rme32: Use SNDRV_PCM_INFO_SYNC_APPLPTR info flag

The recently introduced PCM info flag assures the call of ack ops at
each applptr change, and this is mandatory for the indirect PCM
helpers.

Also, with the proper ack callback, we need no longer prefill at
trigger start.  The relevant code can be killed.
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/rme32.c

@@ -319,7 +319,8 @@ static const struct snd_pcm_hardware snd_rme32_spdif_info = {
 			 SNDRV_PCM_INFO_MMAP_VALID |
 			 SNDRV_PCM_INFO_INTERLEAVED | 
 			 SNDRV_PCM_INFO_PAUSE |
-			 SNDRV_PCM_INFO_SYNC_START),
+			 SNDRV_PCM_INFO_SYNC_START |
+			 SNDRV_PCM_INFO_SYNC_APPLPTR),
 	.formats =	(SNDRV_PCM_FMTBIT_S16_LE | 
 			 SNDRV_PCM_FMTBIT_S32_LE),
 	.rates =	(SNDRV_PCM_RATE_32000 |
@@ -346,7 +347,8 @@ static const struct snd_pcm_hardware snd_rme32_adat_info =
 			      SNDRV_PCM_INFO_MMAP_VALID |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE |
-			      SNDRV_PCM_INFO_SYNC_START),
+			      SNDRV_PCM_INFO_SYNC_START |
+			      SNDRV_PCM_INFO_SYNC_APPLPTR),
 	.formats=            SNDRV_PCM_FMTBIT_S16_LE,
 	.rates =             (SNDRV_PCM_RATE_44100 | 
 			      SNDRV_PCM_RATE_48000),
@@ -370,7 +372,8 @@ static const struct snd_pcm_hardware snd_rme32_spdif_fd_info = {
 			 SNDRV_PCM_INFO_MMAP_VALID |
 			 SNDRV_PCM_INFO_INTERLEAVED | 
 			 SNDRV_PCM_INFO_PAUSE |
-			 SNDRV_PCM_INFO_SYNC_START),
+			 SNDRV_PCM_INFO_SYNC_START |
+			 SNDRV_PCM_INFO_SYNC_APPLPTR),
 	.formats =	(SNDRV_PCM_FMTBIT_S16_LE | 
 			 SNDRV_PCM_FMTBIT_S32_LE),
 	.rates =	(SNDRV_PCM_RATE_32000 |
@@ -397,7 +400,8 @@ static const struct snd_pcm_hardware snd_rme32_adat_fd_info =
 			      SNDRV_PCM_INFO_MMAP_VALID |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE |
-			      SNDRV_PCM_INFO_SYNC_START),
+			      SNDRV_PCM_INFO_SYNC_START |
+			      SNDRV_PCM_INFO_SYNC_APPLPTR),
 	.formats=            SNDRV_PCM_FMTBIT_S16_LE,
 	.rates =             (SNDRV_PCM_RATE_44100 | 
 			      SNDRV_PCM_RATE_48000),
@@ -1104,16 +1108,6 @@ snd_rme32_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 		snd_pcm_trigger_done(s, substream);
 	}
 	
-	/* prefill playback buffer */
-	if (cmd == SNDRV_PCM_TRIGGER_START && rme32->fullduplex_mode) {
-		snd_pcm_group_for_each_entry(s, substream) {
-			if (s == rme32->playback_substream) {
-				s->ops->ack(s);
-				break;
-			}
-		}
-	}
-
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		if (rme32->running && ! RME32_ISWORKING(rme32))