On 22.03.2013 10:03, Peter Meerwald wrote: > >>> I'm running Linux 3.7 on a beagle-xm and observe very reproducible stereo >>> channel swapping issue on playback of a stereo stream (one channel has a >>> sine, the other is zero); the channel swap occurs on starting the playback > >> Always? Or in like 50% of the runs? And is the record stream (IOW: the >> clocks) already running when you switch on playback? > > in 10 runs, the swap can maybe observed 3 times; so: not always > > I can easily turn on/off the clock for the McBSP3/TLV320AIC3104 setup; > with McBSP3 being master I ONLY have the issue when the clock is already > running; when I start the stream first, then turn on the clock, there is > NO SWAP Yes, that sounds familiar. I guess the problem is that the serial line driver does not respect a specific slope (like lo->hi) but will sync up to *any* slope once it gets its enable bit set. Which will give you arbitrary channel swaps. Daniel -- 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
