[PATCH] ALSA: oxfw: fix functional regression for Mackie Onyx 1640i in v5.14 or later

[Takashi Iwai]

On Thu, 28 Oct 2021 15:03:25 +0200,
Takashi Sakamoto wrote:
> 
> 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 at sakamocchi.jp>

Thanks, applied.


Takashi