Monday 10 August 2009 11:43:25 Janusz Krzysztofik wrote: > Monday 10 August 2009 10:50:06 Janusz Krzysztofik wrote: > > Enhance period index accuracy, particularly just before buffer rewind, by > > making use of DMA interrupt status flags in addition to simply counting > > interrupts > > Sorry, this one is still buggy To be clear: I meant only patch 3/3 was buggy, others seemed OK. > an can break other OMAP models. Overstatement. > The bug hits when multiple interrupt flags are set in parallel. Under heavy debugging, for the first time I have noticed several consecutive DMA interrupt requests with all three flags set alltogether: FRAME, LAST and BLOCK. It looks hopeless, doesn't it? Keeping the period index at 0 will not report any progress, other choices (increment, set max) will lead to buffer loss, right? Anyway, that observation seems to prove the requirement for a more accurate period counter. Improving it should help under heavy load. I think it is worth of trying, even if there may be other corner cases still not addressed. v2 of the patch will follow next. Janusz -- 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
