Re: PATCH] SPDIF out clock sync for via8235 / ALC650

[Takashi Iwai <tiwai@suse.de>]

At Mon, 03 Feb 2003 11:36:30 +0100,
David Björkevik wrote:
> 
> Takashi Iwai wrote:
> > 
> > At Sun, 02 Feb 2003 07:03:02 -0500,
> > jgotts@linuxsavvy.com wrote:
> > >
> > > In message <200212302130.gBULUVp24791@ann-arbor.fmfts.com>, jgotts@linuxsavvy.c
> > > om writes:
> > >
> > > >I have produced a minimal patch based upon your work in CVS to get the SPDIF
> > > >port going on A7V8X motherboards with 0.9.0rc6 until 0.9.0rc7 is released:
> > >
> > > I'm not sure what went wrong with 0.9.0rc7, but SPDIF output still doesn't
> > > work with my chipset.  The patch only had cosmetic changes in the 0.9.0rc7
> > > release, so something must have been broken between the CVS tree as of December
> > > 30th and the 0.9.0rc7 release.
> > 
> > on rc7, you don't need a patch.  try to use "spdif" pcm for the spdif
> > output.  it uses the SDX3 channel as described in the data sheet.
> > 
> > playing through the spdif-out on the multi-channel is still posstible,
> > too.  but you need to reset "IEC958 AC97-SPSA" to 0, which corresponds
> > to the slot 3/4, while the slot 10/11 is used as default on via823x.
> 
> This did not work for me. Using rc7 my DAC does not lock to a signal
> using any combination of spdif/default output or AC97-SPSA setting.
> 
> When applying jgotts patch to rc6 I managed to get lock on some
> combinations, but the signal still seemed strange and my DAC did not
> produce any sound.

hmm.

the behavior of via82xx driver depends on the chip model.
hence, first, please check your chip model listed on
/proc/asound/cards.

if it's a VIA8233A, you need to set

- "IEC958 Output" to true
- "IEC958 Playback" to true
- "IEC958 SPSA" to 0

i'm not sure whether "IEC958 Output" can be false.
this register bit controls the DSX3 channel spdif output.

the playback on the DSX3 channel is implemented as hw:1 but i don't
know whether this channel is available on VIA8233A.

if you have VIA8233A, please check whether playback on hw:1 does work
(regardless whether the sound comes out or not).

	% aplay -Dhw:1 foo.wav


if you have another VIA823x, namely, 8233, 8233C and 8235 chips, you
must have valid DSX channels.


Takashi


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