On Tue, Apr 27, 2010 at 04:03:27PM -0500, Timur Tabi wrote: [Reflowing the text into 80 columns again]
> Mark Brown wrote: > > It's entirely possible that if the board designer intended the verious > > SSIs to be used in concert they've done something like cross wire the > > clocks which creates a board-specific interrelationship that needs to be > > dealt with. > Fine, but I don't see how that can be handled with the current code. > Each SSI is independent, and audio is streamed to it via DMA. The > current SSI driver would need to be completely rewritten in order to > initiate both DMA operations simultaneously. The clocking is the least > of my problems. I believe the usual technique is to start the DMA then clock the bus - data doesn't flow over the bus until the clock appears and that appears everywhere simultaneously. Obviously some hardware really doesn't like having the DMA blocked like that, but not all. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
