On Wed, Oct 14, 2015 at 09:21:42AM +0200, Thomas Gleixner wrote: > The firmware gives you an ART/audio timestamp pair. The firmware does > neither know about system time nor about PTP time. > > So we have to do correlation in software.
Ok, so give me the ART/audio and two recent ART/ptp times* spaced one second apart, then I'll tell you audio/ptp with error well under 1 PPM. No need to change the firmware. Who cares about the system time? If the DSP isn't using it, then just leave it out of the equation. Thanks, Richard * If the audio clock isn't locked to the ART, then I'll need two samples. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html