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Subject: Re: i810 sound broken...
From: Juergen Sawinski <juergen.sawinski@mpimf-heidelberg.mpg.de>
To: Doug Ledford <dledford@redhat.com>
Cc: "linux-kernel@vger" <linux-kernel@vger.kernel.org>
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On Wed, 2002-08-07 at 17:05, Doug Ledford wrote:
> On Mon, Aug 05, 2002 at 08:38:52PM +0200, Thomas Munck Steenholdt wrote:
> > On Mon, 2002-08-05 at 17:28, Alan Cox wrote:
> > > On Mon, 2002-08-05 at 14:47, venom@sns.it wrote:
> > > > Still OSS modules for i810 does not work with 2.5 kernels, actually 2.4
> > > > is fine. No time to switch to alsa (and not interested for now too).
> > > 
> > > OSS for 2.5 is someone elses problem. I have no plan to do any work on
> > > the old OSS drivers for the 2.5 tree or even to submit 2.4 updates into
> > > 2.5 for it. 
> > > 
> > 
> > So anyway - How should I go about determining the exact problem on my
> > box... I've had it all along, and I know for a fact that the hardware is
> > OK... Modules are loaded correctly, but it just does not work!
> 
> I'll tell you what you can do.  Grab some ICH docs so you have a list of 
> the valid regs on the i810 sound chip.  Then, go into i810_audio.c and 
> write me up a little hack that, at the end of the chip init sequence, 
> whill dump the state of all the regs on the chip.  Make it smart enough to 
> know about different regs on different chips (aka, Intel ICH0 and ICH1 
> will probably have a slightly different reg setup than the ICH2 and 
> later).  Then, load that driver on your machine and get me that register 
> dump.  Then, I'll take the patch and apply it here on the i810 machines I 
> have that do work and get their register dump.  We'll see then where the 
> differences are.  On the i845 based machine I have at work, where the 
> sound doesn't work just like you describe, I've isolated the problem down 
> to the fact that when we start the DMA engine it *immediately* signals 
> that it has already finished the DMA process and has already stopped again 
> but it never actually does the DMA.  So, I suspect there is some config 
> bit somewhere set wrong and the DMA is not taking place as a result (hell, 
> for all I know, the AC97 link for sound output may be off or something 
> like that).  Getting a register dump from several busted machines as well 
> as from some working machines should enable me to solve the problem 
> relatively easily.  I just haven't had the time to write the patch myself 
> and do any more work on the thing :-(

My i845 box seems to only have a tertiary codec (waiting for
verification from Intel) which is only accesible via DMA. I already
started to make this work... hope, I can show some code end of the week.

But there's sth. about i810_ac97_get. The ICH4 manual says, reads _must
not_ cross DWord boundaries. Could there be a problem? 

> -- 
>   Doug Ledford <dledford@redhat.com>     919-754-3700 x44233
>          Red Hat, Inc. 
>          1801 Varsity Dr.
>          Raleigh, NC 27606
>   
> -
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-- 
Juergen Sawinski
Max-Planck-Institute for Medical Research
Dept. of Biomedical Optics
Jahnstr. 29
D-69120 Heidelberg
Germany

Phone:  +49-6221-486-309
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