On 5/28/08, Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > On Tue, May 27, 2008 at 02:16:54PM -0400, Jon Smirl wrote: > > > I'm having trouble with SPDIF. I can make two devices like this in the > > codec file. But how do I get the SPDIF device hooked up to the right > > AC97 slot, 10/11? Are any of the ASOC codecs implementing SPDIF? > > > None that I know of implementing SPDIF (or at least, none with driver > support for it) but it might be worth taking a look at the PXA2xx AC97 > controller support - it implements supports for AC97 timeslots beyond > the base playback and record channels. I'll look at PXA2xx. I had assumed that some of the SOC codecs were implementing SPDIF and that wrongly led me into the pci code. I'm practicing on the Efika while I wait on our own hardware. The Efika hardware can support simultaneous independent playback on analog and spdif. I see now that it is too hard to jump straight to independent playback, instead I'll work on getting them both to play standalone. For independent playback I need to interleave the data from two buffers and DMA it into the PSC. I believe the Bestcomm DMA controller can do this. Does ALSA hand me the two buffers simultaneously? I haven't located any code yet supporting independent playback. > > Briefly, the approach is to provide a DAI in the AC97 controller driver > which handles the relevant AC97 timeslots and a DAI in the CODEC driver > which does the CODEC side of things then match the two together. > > > > I also see that the STAC9766 is missing an ac97_patch. From my reading > > of the datasheet it needs somethings fixed up. > > > Does the ac97 support belong in the PCI directory? It took me a while > > to locate it while working on ASOC. With a model more like ASOC > > codecs, the AC97 patches could be pushed into the codec files. > > > The ASoC AC97 support doesn't use the AC97 patch infrastructure at all - > it's completely independent so things are pretty much as you describe, > everything is in the CODEC drivers. I've figured out now that the pci codec code is independent of the asoc code. Are there plans to unify this in the future? > -- Jon Smirl jonsmirl@xxxxxxxxx _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
