Re: SIS7012 SPDIF support

[Takashi Iwai <tiwai@suse.de>]

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At Tue, 03 Jun 2003 12:24:03 +0100,
James Courtier-Dutton wrote:
> 
> Takashi Iwai wrote:
> > At Mon, 02 Jun 2003 17:01:42 +0100,
> > James Courtier-Dutton wrote:
> > 
> >>Is the SPDIF output of the SIS7012 (i810 with ac97)  supported in alsa.
> >>If so, how does one enable the SPDIF out.
> >>The current kernel OSS module supports it.
> > 
> > 
> > which OSS (kernel) version supports spdif out on this chip?
> > i'd like to take a look.
> > 
> > 
> > ciao,
> > 
> > Takashi
> > 
> > 
> The user I was talking to on irc had kernel 2.4.21-ac-rc1  or something 
> like that.
> I have root access to his box if you need any more info.
> linux-2.4.21-rc1.tar.bz2
> 
> I attach the source files that I think you need.

thanks.   looking at the codes, it seems that no special handling for
the chip.  it simply sets up the ac97 registers.

the patch below is a quick hack to set the spdif rate on the first
playback pcm device.  in addition, you'll need to set up the following
mixer controls:

- 'IEC958 AC97-SPSA' to 0 (slots 3/4).
- 'IEC958 Playback Switch' to on.

you might need to set up 'IEC958 Playback Default', too, but it might
not...  try once the above two switches at first.


Takashi

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Index: alsa-kernel/pci/intel8x0.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/pci/intel8x0.c,v
retrieving revision 1.82
diff -u -r1.82 intel8x0.c
--- alsa-kernel/pci/intel8x0.c	20 May 2003 12:51:07 -0000	1.82
+++ alsa-kernel/pci/intel8x0.c	3 Jun 2003 12:01:59 -0000
@@ -869,6 +869,9 @@
 		for (i = 0; i < 3; i++)
 			if (ichdev->ac97_rate_regs[i])
 				snd_ac97_set_rate(ichdev->ac97, ichdev->ac97_rate_regs[i], runtime->rate);
+		/* FIXME: hack to enable spdif support */
+		if (ichdev->ichd == ICHD_PCMOUT && chip->device_type == DEVICE_SIS)
+			snd_ac97_set_rate(ichdev->ac97, AC97_SPDIF, runtime->rate);
 	}
 	snd_intel8x0_setup_periods(chip, ichdev);
 	return 0;