linux-kernel - Re: [alsa-devel] looping S/PDIF data

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Message-ID: <20080620214516.28e9d3f3@mjolnir.drzeus.cx>
Date:	Fri, 20 Jun 2008 21:45:16 +0200
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>
Cc:	Rene Herman <rene.herman@...access.nl>,
	ALSA devel <alsa-devel@...a-project.org>, mulix@...ix.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] looping S/PDIF data

On Thu, 19 Jun 2008 14:48:19 +0200
Takashi Iwai <tiwai@...e.de> wrote:

> At Thu, 19 Jun 2008 14:39:05 +0200 (CEST),
> Jaroslav Kysela wrote:
> > 
> > I don't think that this patch is correct. DMA transfers should be disabled 
> > by:
> > 
> > outl(what, TRID_REG(trident, T4D_STOP_B));
> > outl(val, TRID_REG(trident, T4D_AINTEN_B));
> 
> They are already in the trigger callback as long as I saw the code
> quickly.  So the problem should be somewhere else.
> 
> > lines. Adding &= ~SPDIF_EN can disable output from AC97 to S/PDIF as well.
> 
> That's true.
> 
> Anyway, if you are up now, I'll let you hunt further as you are the
> author of the driver :)
> 

Are there any specs on this hardware? I could play around a bit myself,
but I can't really find any documentation on the registers.

Rgds
-- 
     -- Pierre Ossman

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