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

[Takashi Sakamoto]

On Thu, Oct 28, 2021 at 05:44:37PM +0200, Takashi Iwai wrote:
> 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

Oops. I forget to add tag to stable. It's preferable to apply the
patch to current stable (5.14.15) and mainline RC (5.15-rc7) as well...

Would I request you to post the patch for the purpose alternatively?
(It is perhaps too late for mainline, I guess...)


Regards

Takashi Sakamoto