On Tue, 16 Feb 2010 11:19:25 -0700 Gary Thomas <gary@xxxxxxxxxxxx> wrote: > I need to connect the OMAP (3530) to a 24bit CODEC. So far > my attempts at getting this to go have not gone well. Then > I ran across this comment in sound/soc/omap/omap-pcm.c: > /* > * Note: Regardless of interface data formats supported by OMAP McBSP > * or EAC blocks, internal representation is always fixed 16-bit/sample > */ > > Does this mean that this setup is just not supported? even though > the hardware can handle it? > Yep, comment is bit misleading but true until some patch will remove it. IRCC, the EAC was limited to 16-bit and also there wasn't need and HW to test other formats than S16_LE in McBSP DAI. > Thanks for any pointers or ideas on how to get this going. > I would first start adding support for the S32_LE into omap-pcm.c (DMA part). Worth to look this thread: http://mailman.alsa-project.org/pipermail/alsa-devel/2010-January/024704.html Then add support for this format to the omap-mcbsp.c (link configuration part). Next step would be to add support for the S24_LE on 4-byte boundaries. I.e. the DMA is moving 32-bit samples between the memory and McBSP but only 24-bits are transferred over the McBSP and codec. -- Jarkko -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
