[ALSA] remove incorrect usage of SNDRV_PCM_INFO_SYNC_START and snd_pcm_set_sync()

Set the SNDRV_PCM_INFO_SYNC_START flag and the substream's sync ID
(only) if the substream actually can be linked to another one.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 11 insertions, 5 deletions

diff --git a/sound/pci/emu10k1/p16v.c b/sound/pci/emu10k1/p16v.c
index 6ace1076c19b..d619a3842cdd 100644
--- a/sound/pci/emu10k1/p16v.c
+++ b/sound/pci/emu10k1/p16v.c
@@ -124,11 +124,12 @@
 
  /* hardware definition */
 static struct snd_pcm_hardware snd_p16v_playback_hw = {
-        .info =                 (SNDRV_PCM_INFO_MMAP | 
-                                 SNDRV_PCM_INFO_INTERLEAVED |
-                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
-                                 SNDRV_PCM_INFO_RESUME |
-                                 SNDRV_PCM_INFO_MMAP_VALID),
+        .info =                 SNDRV_PCM_INFO_MMAP | 
+                                SNDRV_PCM_INFO_INTERLEAVED |
+                                SNDRV_PCM_INFO_BLOCK_TRANSFER |
+                                SNDRV_PCM_INFO_RESUME |
+                                SNDRV_PCM_INFO_MMAP_VALID |
+                                SNDRV_PCM_INFO_SYNC_START,
         .formats =              SNDRV_PCM_FMTBIT_S32_LE, /* Only supports 24-bit samples padded to 32 bits. */
         .rates =                SNDRV_PCM_RATE_192000 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_44100, 
         .rate_min =             44100,
@@ -207,6 +208,11 @@ static int snd_p16v_pcm_open_playback_channel(struct snd_pcm_substream *substrea
         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
                 return err;
 
+        runtime->sync.id32[0] = substream->pcm->card->number;
+        runtime->sync.id32[1] = 'P';
+        runtime->sync.id32[2] = 16;
+        runtime->sync.id32[3] = 'V';
+
         return 0;
 }
 /* open_capture callback */