On Tue, 1 Jun 2010 13:30:10 +0300 Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx> wrote: > Because, if you want to transfer in one SDMA burst more than the space free in > the McBSP FIFO, than where would the rest go? > I would have expected peripheral to deassert the DMA request but I haven't read the TRM so detail and experimenting with bigger period sizes didn't work so some /dev/null effect was obviously happening :-) > I guess it could be better than having 128 word long periods on McBSP1, 3, 4, > and 5. With small period size the applications also need to be woken up, but if > we silently handling the DMA IRQs, and the application is only woken up by every > 10. DMA IRQ, it might still save some power? > This is worth to experiment. Probably more interrupts with or without application wakeup reduction does not increase power as much as the savings are from core clocks being more idle. -- Jarkko _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
