Re: [PATCH] Tascam US-224/428 MMC Implementation

[Takashi Iwai <tiwai@suse.de>]

At Mon, 2 Aug 2004 16:43:09 +0100 (WEST),
Rui Nuno Capela wrote:
> 
> Hi Takashi, Karten, Martin,
> everyone else,
> 
> >> BTW, I think this has been asked before but didn't had the chance to
> >> know the right answer, so what's keeping snd-usb-usx2y out of the
> >> stock 2.6 kernel.org tree?
> >>
> >> Anything to do with firmware licensing? IIRC there's already a GPL'd
> >> bootstrap loader...
> >
> > No, just because I don't know whether the driver works on 2.6 kernel.
> > No one reported/requested on alsa-devel ML yet.
> >
> > If it's confirmed to work, it's ok to push it up to 2.6 tree after
> > some reviews/clean-up's.
> >
> 
> OK. Now that you're asking, I've been testing on a couple of my boxes
> and the results are a mix of success and a complete disappointment:
> 
> 1) SUSE 9.1 Professional, vanilla 2.6.8-rc2 SMP/HT preemptible, NPTL 0.61:
>    - hotplug/firmware load: OK.
>      - snd-usb-usx2y 1.0.5a: OK, jackd RT: OK.
>      - snd-usb-usx2y CVS HEAD 2004-08-01: OK, jackd RT: OK.
> 
> 2) Mandrake 10.0 Official vanilla 2.6.8-rc2 UP preemptible, NPTL 0.60:
>    - hotplug/firmware load: OK.
>      - snd-usb-usx2y 1.0.5a: OK, jackd RT: unstable, non-RT seems OK.
>      - snd-usb-usx2y CVS HEAD 2004-08-01: KO. HORROR!
>        As soon as the pcm device is requested (e.g. via aplay)
>        the whole system freezes, puff!

That's bad.  Can you get any trace via magic sysrq?

>      This is a true showstopper as a matter of fact. FWIW it doesn't
>      matter whether on NPTL or linuxthreads. In fact, I don't even know
>      if this pthreads stuff has any influence at all. Certainly not.
>      Please note that last patch of Karsten's probably did the
>      difference, unfortunately for worse :/
> 
> FYI I'm on 2.6 since January, and I can certainly argue that on this
> SUSE box everything is working flawlessly, period. Problem comes on that
> Mdk box, don't know why. Is it due to SMP/HT?

Could be.  Can you try a UP kernel on Mandrake for testing?


Anyway, we'll need clean up of codes before moving to alsa-kernel
tree.  The all 2.4/2.2-specific codes should be stripped down and
provided as patches in alsa-driver.

I can do it but I'm afraid of breaking something.  Could any usx2y
owner take this action?


Takashi


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