From: Dan Malek <dan@netx4.com>
To: BenH <bh40@calva.net>
Cc: paulus@linuxcare.com, linuxppc-dev@lists.linuxppc.org
Subject: Re: dmasound problems
Date: Mon, 29 Nov 1999 19:42:09 -0500 [thread overview]
Message-ID: <38431D61.4977E59B@netx4.com> (raw)
In-Reply-To: 19991130012819.012476@smtp.calvacom.fr
BenH wrote:
> I tried reproducing the complete init-cleanup-init sequence in
> dmasound_init() without luck (weird...). There must be some kind of
> timing issue out there, or I missed something. I don't know the AWACS
> chip very well so it's difficult to guess.
If these are actually a power and reset to the audio codec, there
are timing constraints. Usually, you have to power up and hold
reset at least 50 milliseconds before releasing reset (Crystal
codec specs).
This is why it may work with XMON if you set/clear bits
individually, but not work when you run the code.
-- Dan
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-11-30 0:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-11-30 0:28 dmasound problems BenH
1999-11-30 0:42 ` Dan Malek [this message]
1999-11-30 15:44 ` Benjamin Herrenschmidt
1999-11-30 15:49 ` Dan Malek
1999-11-30 17:34 ` Benjamin Herrenschmidt
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