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Date:   Wed, 16 Dec 2020 18:22:36 -0800
From:   Richard Cochran <>
To:     Jakub Kicinski <>
Cc:     Holger Assmann <>,
        Giuseppe Cavallaro <>,
        Alexandre Torgue <>,
        Jose Abreu <>,
        "David S. Miller" <>,
        Maxime Coquelin <>,
        Rayagond Kokatanur <>,, Michael Olbrich <>,
        Ahmad Fatoum <>,
        Jose Abreu <>,,,,
Subject: Re: [PATCH 1/2] net: stmmac: retain PTP-clock at hwtstamp_set

On Wed, Dec 16, 2020 at 05:13:34PM -0800, Jakub Kicinski wrote:
> On Wed, 16 Dec 2020 12:32:38 +0100 Holger Assmann wrote:
> > As it is, valid SIOCSHWTSTAMP ioctl calls - i.e. enable/disable time
> > stamping or changing filter settings - lead to synchronization of the
> > NIC's hardware clock with CLOCK_REALTIME. This might be necessary
> > during system initialization, but at runtime, when the PTP clock has
> > already been synchronized to a grand master, a reset of the timestamp
> > settings might result in a clock jump.

+1 for keeping the PHC time continuous.

> Please remember to CC Richard, the PTP maintainer.

+1 to that, too!


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