On Thu, Apr 25, 2013 at 3:09 PM, Russell King - ARM Linux <li...@arm.linux.org.uk> wrote:
> There's a problem with device to device transfers though - you have to > consider the rate at which the devices produce and consume data, and > whether they both can cope with differing data rates. > > Take for instance your audio in to audio out idea - even if they are > both operating at the same bits per sample and sample rate, if they are > independently clocked, chances are that the clocks are not exactly the > same, which means you will either underrun or overrun one of the FIFOs > in the system. This magically works for us, but yes, I think they had to use the same clock (simplest solution, anyway). It is/was a very real usecase, IIRC coming from roundtrip constraints in the GSM 3GPP spec, wanting to keep the latency as low as possible. With this scheme there is no more than a FIFO on each end of delay, which is nice. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
