Re: intel8x0m and conexant ac97 modem codecs

["Jared D. McNeill" <jared.mcneill@gmail.com>]

On Apr 12, 2005 3:05 PM, Lee Revell <rlrevell@joe-job.com> wrote:
> On Tue, 2005-04-12 at 13:05 -0300, Jared D. McNeill wrote:
> > Hi folks, not sure if this is the right place to ask but I might as
> > well give it a shot anyway --
> >
> > I'm working on adding AC97 modem support to NetBSD, and I have run
> > into a stumbling block. From what I've read, it looks like Conexant
> > AC97 modem codecs aren't supported by the ALSA intel8x0m / slmodem
> > solution. What are the technical reasons for this?
> 
> Do you know if any open source driver ever existed for these?  "Lack of
> documentation" is the obvious suspect...

I was under the impression that all AC97 modem codecs were supposed to
work the same (as in, use them as the AC97 spec says to). The NetBSD
driver appears to be working for non-Conexant codecs, but I can't get
a Conexant chip to power up through the same initialization routine.
ac97_read(as, AC97_REG_EXT_MODEM_CTRL, &reg) always returns 0xff00
("everything powered down" in the AC97 modem world) on the few
variations of Conexant codecs we've tried.

"Lack of documentation" is most likely the reason; I guess I was just
looking for confirmation from another group that either "Yes, these
chips are broken, we don't support them because we don't have any
documentation", or "Yes, these chips are broken, we had to work around
the problem by doing foo".

Meanwhile, I'm still working on getting some useful documentation from
Conexant..

Cheers,
Jared


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