today's 6.1 would not boot here

[Ariff Abdullah]

On Mon, 27 Feb 2006 13:45:52 -0700
Scott Long <scottl at samsco.org> wrote:
> Ariff Abdullah wrote:
> > On Mon, 27 Feb 2006 12:38:26 -0700
> > Scott Long <scottl at samsco.org> wrote:
> > 
> >>Is this a problem with calibrating the sample rate on the chip? 
> >>There  was a problem with snd_ich several years ago where the
> >>calibration would fail or be unpredictable during boot.  I fixed
> >it >my moving the  calibration code to a separate step that gets
> >run via >the  config_intrhook API.  That made it work reliably
> >during boot >and when loaded after boot.  Is this new problem
> >somehow related to >this?  Since I was the one who fixed it in the
> >past, I'd be happy to >help now.
> >>
> > 
> > It seems related. From my naked eyes, I can sense that the
> > interrupt was trigered during/before sampling rate calibration,
> > and since the calibration expect to not trigger any interrupt,
> > this will cause unexpected behaviour especially for this MPSAFEed
> > driver *and* during boot. Besides, the pcm construction also done
> > before the calibration, unlike snd_atiixp where the hook is use to
> > bring everything alive after the necessary step is finished.
> > 
> > 
> > I'll come up with something shortly.
> > 
> Maybe move the bus_setup_intr() call to after the calibration?  If
> the driver doesn't need interrupts until after calibration, I think
> that this would cleanly solve the problem.
> 
Good idea, or, simply ignore interrupt trigger until all has been
calibrated. Pretty much like this:

http://people.freebsd.org/~ariff/test/ich.c



--
Ariff Abdullah
FreeBSD
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