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

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Date:	Fri, 20 Jun 2008 21:52:55 +0200
From:	Rene Herman <rene.herman@...access.nl>
To:	Pierre Ossman <drzeus@...eus.cx>
CC:	Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>,
	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 20-06-08 21:45, Pierre Ossman wrote:

> 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.

At:

ftp://ftp.alsa-project.org/pub/manuals/trident/

there's a 4D-Wave DX technical reference manual and .doc files which at 
first glance look useful.

Rene.
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