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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2021-10-28 16:03:25 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-10-28 18:33:11 +0300 |
| commit | cddcd5472abb7b8a9c37ccbcf0908b79740a01b5 (patch) | |
| tree | 75f78075ef4e548a50bc8b9fa7aa50617b5f7718 /sound/firewire/oxfw/oxfw.h | |
| parent | 407359d44ed33974137b9158da356d53f999dcf2 (diff) | |
| download | linux-cddcd5472abb7b8a9c37ccbcf0908b79740a01b5.tar.xz | |
ALSA: oxfw: fix functional regression for Mackie Onyx 1640i in v5.14 or later
A user reports functional regression for Mackie Onyx 1640i that the device
generates slow sound with ALSA oxfw driver which supports media clock
recovery. Although the device is based on OXFW971 ASIC, it does not
transfer isochronous packet with own event frequency as expected. The
device seems to adjust event frequency according to events in received
isochronous packets in the beginning of packet streaming. This is
unknown quirk.
This commit fixes the regression to turn the recovery off in driver
side. As a result, nominal frequency is used in duplex packet streaming
between device and driver. For stability of sampling rate in events of
transferred isochronous packet, 4,000 isochronous packets are skipped
in the beginning of packet streaming.
Reference: https://github.com/takaswie/snd-firewire-improve/issues/38
Fixes: 029ffc429440 ("ALSA: oxfw: perform sequence replay for media clock recovery")
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20211028130325.45772-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/oxfw/oxfw.h')
| -rw-r--r-- | sound/firewire/oxfw/oxfw.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sound/firewire/oxfw/oxfw.h b/sound/firewire/oxfw/oxfw.h index c13034f6c2ca..d728e451a25c 100644 --- a/sound/firewire/oxfw/oxfw.h +++ b/sound/firewire/oxfw/oxfw.h @@ -47,6 +47,11 @@ enum snd_oxfw_quirk { // the device to process audio data even if the value is invalid in a point of // IEC 61883-1/6. SND_OXFW_QUIRK_IGNORE_NO_INFO_PACKET = 0x10, + // Loud Technologies Mackie Onyx 1640i seems to configure OXFW971 ASIC so that it decides + // event frequency according to events in received isochronous packets. The device looks to + // performs media clock recovery voluntarily. In the recovery, the packets with NO_INFO + // are ignored, thus driver should transfer packets with timestamp. + SND_OXFW_QUIRK_VOLUNTARY_RECOVERY = 0x20, }; /* This is an arbitrary number for convinience. */ |