[PATCH v2 net] net: stmmac: retain PTP clock time during SIOCSHWTSTAMP ioctls

[patchwork-bot+netdevbpf at kernel.org]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem at davemloft.net>:

On Sun, 21 Nov 2021 19:57:04 +0200 you wrote:
> From: Holger Assmann <h.assmann at pengutronix.de>
> 
> Currently, when user space emits SIOCSHWTSTAMP ioctl calls such as
> enabling/disabling timestamping or changing filter settings, the driver
> reads the current CLOCK_REALTIME value and programming this into the
> NIC's hardware clock. This might be necessary during system
> initialization, but at runtime, when the PTP clock has already been
> synchronized to a grandmaster, a reset of the timestamp settings might
> result in a clock jump. Furthermore, if the clock is also controlled by
> phc2sys in automatic mode (where the UTC offset is queried from ptp4l),
> that UTC-to-TAI offset (currently 37 seconds in 2021) would be
> temporarily reset to 0, and it would take a long time for phc2sys to
> readjust so that CLOCK_REALTIME and the PHC are apart by 37 seconds
> again.
> 
> [...]

Here is the summary with links:
  - [v2,net] net: stmmac: retain PTP clock time during SIOCSHWTSTAMP ioctls
    https://git.kernel.org/netdev/net/c/a6da2bbb0005

You are awesome, thank you!
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