Messages in this thread | | | Date | Wed, 14 Oct 2015 09:21:42 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v4 1/4] Produce system time from correlated clocksource |
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On Tue, 13 Oct 2015, Richard Cochran wrote: > On Tue, Oct 13, 2015 at 09:15:51PM +0200, Thomas Gleixner wrote: > > That's not working. The firmware is not going to change, no matter > > what. > > Can we at least have a explanation of how the firmware operates? How > are (ART,sys) pairs are generated, and how they are supposed to get > into the DSP?
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.
Thanks,
tglx
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