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

[Jean-Paul Argudo]

Hi Takashi, Hi all,

Le samedi 09 novembre 2019 à 21:36 +0900, Takashi Sakamoto a écrit :
> Hi,
> 
> I'm sorry to be late for reply but I have a short vacation in this
> week.

Same here, I was in vacation in Asia until late last 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.

Great, thanks for that...

> 
> > > > 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.

Uff! :)

> 
> > > > 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):
> https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/sound/firewire/bebob?id=acfedcbe1ce4c69e1da914f39c02d945c80198d4

Thanks for the patch, unfortunately I don't have time until this week-
end to test the linux kernel version of the patch..

BUT:

> 
> 
> 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:
> https://github.com/takaswie/snd-firewire-improve

I tested this DKMS version, it's easier for me and with less impacts.

What I can say is that my unit is running now normaly on my computer, 
with 

$ uname -a
Linux deiphobe 5.3.0-20-lowlatency #21-Ubuntu SMP PREEMPT Wed Oct 23
17:03:51 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

kernel, on Ubuntu 19.10

Running the simple DKMS install version on the README of the snd-
firewire-improve, with a recent git clone

Tell me if you need more information so far.

I continue on testing things, but for the moment, 0 problems (I also
have a audio unit on USB (GTX headset on USB) for audioconferencing
stuff (Zoom) and so far, no problem at all, I can use both.

Same with the NVDIA output over HDMI, on my screen (with a crappy small
stereo inside the screen). 

Very cool to have the ADAM F7 monitors sound back!!!!!!


**thanks**** !!

> 
> 
> 
> Regards
> 
> Takashi Sakamoto
>