On Tue, 18 May 2010 21:13:10 +0100 Liam Girdwood <lrg@xxxxxxxxxxxxxxx> wrote: > I've also added a patch to remove the mcbsp DMA op mode sysfs set functionality. > I think DMA op mode is very specific to the mcbsp client driver _only_ and > shouldn't really be changed by userspace. Please let me know if you use this > feature and I'll drop this patch. > I've used to say that the DMA op mode is more like use-case not machine specific but I'm not sure is my point valid onemore. I've used to think that low-latency processing would need accurate DMA pointer (op mode == element) while mp3 playback would need low power consumption (op mode == threshold). Peter: what's the status today how well can we do low-latency processing with threshold mode? IRCC, with your FIFO delay query patches, can we estimate the DMA pointer position with enough accuracy? -- 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
