[PATCH] ALSA: oxfw: fix functioal regression for silence in Apogee Duet FireWire

[Takashi Iwai]

On Thu, 12 Aug 2021 04:28:39 +0200,
Takashi Sakamoto wrote:
> 
> OXFW 971 has no function to use the value in syt field of received
> isochronous packet for playback timing generation. In kernel prepatch for
> v5.14, ALSA OXFW driver got change to send NO_INFO value in the field
> instead of actual timing value. The change brings Apogee Duet FireWire to
> generate no playback sound, while output meter moves.
> 
> As long as I investigate, _any_ value in the syt field takes the device to
> generate sound. It's reasonable to think that the device just ignores data
> blocks in packet with NO_INFO value in its syt field for audio data
> processing.
> 
> This commit adds a new flag for the quirk to fix regression.
> 
> Fixes: 029ffc429440 ("ALSA: oxfw: perform sequence replay for media clock recovery")
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>

Applied now.  Thanks.


Takashi