]> git.baikalelectronics.ru Git - kernel.git/commit
ALSA: oxfw: perform sequence replay for media clock recovery
authorTakashi Sakamoto <o-takashi@sakamocchi.jp>
Mon, 31 May 2021 02:51:00 +0000 (11:51 +0900)
committerTakashi Iwai <tiwai@suse.de>
Tue, 1 Jun 2021 06:19:12 +0000 (08:19 +0200)
commitca5b9acfa0a62e1ac53618aef08087967695bcef
tree86de12a6b781daaec135c4c907beaa0bc659c99d
parent79143593a7d9d3c396bfe0b3bb58a55d0c62d11c
ALSA: oxfw: perform sequence replay for media clock recovery

This commit takes ALSA oxfw driver to perform sequence replay for media
clock recovery. Unfortunately, OXFW970 ASIC and its firmware has a quirk
called jumbo payload which skips several isochronous cycles for packet
transmission, thus the sequence replay is just adopted to OXFW971 ASIC.
As well as Fireworks, OXFW ASICs also ignores presentation time against
the way in IEC 61883-1/6.

The sequence replay is tested with below models:
 * Tascam FireOne
 * Stanton Magnetics SCS.1m
 * Apogee Duet FireWire

For below models, the sequence replay is tested to be disabled:

 * Griffin FireWave
 * Behringer F-Control Audio 202
 * Loud Technology Tapco Link.FireWire 4x6
 * Loud Technology Mackie Onyx Satellite

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210531025103.17880-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/firewire/oxfw/oxfw-stream.c