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| author | Erwin Burema <e.burema@gmail.com> | 2020-05-10 20:29:11 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-05-15 19:14:29 +0200 |
| commit | 10ce77e4817fef99e1166be7e6685a80c63bf77f (patch) | |
| tree | 249422b14e8db6b079f8c5ee232fcb918cb9dded /sound/usb/card.h | |
| parent | 47b4f5f5b65680fbef7a7a9a4796b35f38a6e43e (diff) | |
| download | linux-10ce77e4817fef99e1166be7e6685a80c63bf77f.tar.gz | |
ALSA: usb-audio: Add duplex sound support for USB devices using implicit feedback
For USB sound devices using implicit feedback the endpoint used for
this feedback should be able to be opened twice, once for required
feedback and second time for audio data. This way these devices can be
put in duplex audio mode. Since this only works if the settings of the
endpoint don't change a check is included for this.
This fixes bug 207023 ("MOTU M2 regression on duplex audio") and
should also fix bug 103751 ("M-Audio Fast Track Ultra usb audio device
will not operate full-duplex")
Fixes: c249177944b6 ("ALSA: usb-audio: add implicit fb quirk for MOTU M Series")
Signed-off-by: Erwin Burema <e.burema@gmail.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=207023
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=103751
Link: https://lore.kernel.org/r/2410739.SCZni40SNb@alpha-wolf
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.h')
| -rw-r--r-- | sound/usb/card.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h index 820e564656ed..d6219fba9699 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -108,6 +108,7 @@ struct snd_usb_endpoint { int iface, altsetting; int skip_packets; /* quirks for devices to ignore the first n packets in a stream */ + bool is_implicit_feedback; /* This endpoint is used as implicit feedback */ spinlock_t lock; struct list_head list; |