Re: [Linuxptp-users] Synchronization fault with stmmac

[Richard C. <ric...@gm...>]

On Tue, Mar 25, 2014 at 09:52:32AM +0100, Mohamed Belaouad wrote:

> To sum up, the ppb adjustment passed to the driver is limited to
> [-32,768,000 | 32,768,000] and when passing values > 32,768,000 it
> saturates to -32,768,000.

Why are you passing values greater than what the device can handle?
That doesn't make sense to do, and we don't do it in ptp4l.

> Also, what we would like to know is: is the max ppb adjustment check
> done in the PTP subsystem (I have not found anything about it in
> drivers/ptp, maybe wrong location?) or should it be handled in the
> driver?

There is no check in the kernel. I guess that ptp_clock_adjtime could
return ERANGE in such a case.

You do realize that all of this has nothing to do with your stmmac
troubles, don't you?

Thanks,
Richard