[ALSA] usb-audio: add SNDRV_PCM_INFO_BATCH flag

USB generic driver
Add the SNDRV_PCM_INFO_BATCH flag to the PCM hardware information to
indicate that the driver uses double buffering.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index bfbec58..da22f25 100644 (file)
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1439,9 +1439,11 @@ static int snd_usb_pcm_prepare(snd_pcm_substream_t *substream)
 
 static snd_pcm_hardware_t snd_usb_playback =
 {
-       .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
-                                SNDRV_PCM_INFO_BLOCK_TRANSFER |
-                                SNDRV_PCM_INFO_MMAP_VALID),
+       .info =                 SNDRV_PCM_INFO_MMAP |
+                               SNDRV_PCM_INFO_MMAP_VALID |
+                               SNDRV_PCM_INFO_BATCH |
+                               SNDRV_PCM_INFO_INTERLEAVED |
+                               SNDRV_PCM_INFO_BLOCK_TRANSFER,
        .buffer_bytes_max =     (256*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),
@@ -1451,9 +1453,11 @@ static snd_pcm_hardware_t snd_usb_playback =
 
 static snd_pcm_hardware_t snd_usb_capture =
 {
-       .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
-                                SNDRV_PCM_INFO_BLOCK_TRANSFER |
-                                SNDRV_PCM_INFO_MMAP_VALID),
+       .info =                 SNDRV_PCM_INFO_MMAP |
+                               SNDRV_PCM_INFO_MMAP_VALID |
+                               SNDRV_PCM_INFO_BATCH |
+                               SNDRV_PCM_INFO_INTERLEAVED |
+                               SNDRV_PCM_INFO_BLOCK_TRANSFER,
        .buffer_bytes_max =     (256*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (128*1024),