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authorTakashi Iwai <tiwai@suse.de>2021-10-11 12:36:50 +0200
committerTakashi Iwai <tiwai@suse.de>2021-10-12 14:32:46 +0200
commit53451b6da8271905941eb1eb369db152c4bd92f2 (patch)
treea74735bf09aa103b55a1f948c1bf173c03177e30 /sound/usb/pcm.c
parentALSA: usb-audio: Add support for the Pioneer DJM 750MK2 Mixer/Soundcard (diff)
downloadlinux-53451b6da8271905941eb1eb369db152c4bd92f2.tar.xz
linux-53451b6da8271905941eb1eb369db152c4bd92f2.zip
ALSA: usb-audio: Less restriction for low-latency playback mode
The recent support for the improved low-latency playback mode applied the SNDRV_PCM_INFO_EXPLICIT_SYNC flag for the target streams, but this was a slight overkill. The use of the flag above disables effectively both PCM status and control mmaps, while basically what we want to track is only about the appl_ptr update. For less restriction, use a more proper flag, SNDRV_PCM_INFO_SYNC_APPLPTR instead, which disables only the control mmap. Fixes: d5f871f89e21 ("ALSA: usb-audio: Improved lowlatency playback support") Link: https://lore.kernel.org/r/20211011103650.10182-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/pcm.c')
-rw-r--r--sound/usb/pcm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 3bb095a3c9b6..95ec8eec1bb0 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1102,7 +1102,7 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
/* need an explicit sync to catch applptr update in low-latency mode */
if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
as->chip->lowlatency)
- runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
+ runtime->hw.info |= SNDRV_PCM_INFO_SYNC_APPLPTR;
runtime->private_data = subs;
subs->pcm_substream = substream;
/* runtime PM is also done there */