[alsa-devel] snd-bebob : from kernel 4.13 to 5.3.19 and .20

[Michael Beer]

"Takashi Sakamoto" <o-takashi at sakamocchi.jp> – November 9, 2019 1:38 PM
> Hi,
> 
> I'm sorry to be late for reply but I have a short vacation in this week.
> 
> On Wed, Oct 30, 2019 at 03:40:03PM +0100, Jean-Paul Argudo wrote:
> > > * /proc/asound/cardX/firewire/firmware
> > 
> > $ cat /proc/asound/card3/firewire/firmware 
> > Manufacturer: bridgeCo
> > Protocol Ver: 1
> > Build Ver: 0
> > GUID: 0x00130E010004394C
> > Model ID: 0x02
> > Model Rev: 1
> > Firmware Date: 20061207
> > Firmware Time: 140826
> > Firmware ID: 0x0
> > Firmware Ver: 16850194
> > Base Addr: 0x20080000
> > Max Size: 1572864
> > Loader Date: 20051019
> > Loader Time: 094952
> 
> Before vacation I made arrangement to buy Focusrite Saffire LE in used
> market and today it arrived. As long as I can see, the unit uses the same
> firmware which your unit uses.
> 
> >>> At startup it lights green ok, but no sound is playable, then the
> >>> lights turn orange (like it is when it's not working), I hear a
> >>> "relay sound" (a electric clic of a relay), then, the Saffire LE
> >>> disapears from the sound menu in Ubuntu sound menu.
> 
> I can regenerate this phenomena.
> 
> >>> I can see this in dmesg:
> >>> 
> >>> [ 19.083583] snd-bebob fw1.0: Detect discontinuity of CIP: 10 50
> >>> [ 19.746665] snd-bebob fw1.0: Detect discontinuity of CIP: A0 A8
> >>> ...
> >>> [ 284.965508] snd-bebob fw1.0: Detect discontinuity of CIP: D0 10
> >>> [ 285.469348] snd-bebob fw1.0: Detect discontinuity of CIP: 68 A8
> >>> [ 285.965174] snd-bebob fw1.0: Detect discontinuity of CIP: 20 60
> >>> [ 285.981618] firewire_core 0000:05:01.0: phy config: new root=ffc1,
> >>> gap_count=5
> >>> [ 290.103982] firewire_core 0000:05:01.0: phy config: new root=ffc1,
> gap_count=5
> 
> I can see as well.
> 
> Then, I realized that these discontinuity occurs in packet streaming
> of 'second or later'. In short, once disconnection of packet streaming,
> the unit transfers packets with discontinuity in packet streaming of
> reconnection. Furthermore, the discontinuity is in the early isoc
> cycles of packet streaming.
> 
> I've already commit to avoid the detection of discontinuity in recent
> commit for v5.5 kernel (under development):
> git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/sound/firewire/bebob
> 
> In this patch, isoc packets from the device are captured enough after
> connection to skip early cycles of packet streaming, thus the
> discontinuity is not detected.
> 
> As long as I tested, this version of ALSA BeBoB driver works well with
> the device. I'd like you to test with backport drivers as well:
> github.com/takaswie/snd-firewire-improve
> 
> 
> Regards
> 
> Takashi Sakamoto
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel at alsa-project.org
> mailman.alsa-project.org/mailman/listinfo/alsa-devel