RE: [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller

[Brown, Aaron F]

> From: netdev-owner@xxxxxxxxxxxxxxx [mailto:netdev-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Bernd Faust
> Sent: Thursday, February 16, 2017 10:42 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@xxxxxxxxx>; Lubetkin, YanirX
> <yanirx.lubetkin@xxxxxxxxx>; intel-wired-lan@xxxxxxxxxxxxxxxx;
> netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Cc: Bernd Faust <berndfaust@xxxxxxxxx>
> Subject: [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller
> 
> After an upgrade to Linux kernel v4.x the hardware timestamps of the
> 82579 Gigabit Ethernet Controller are different than expected.
> The values that are being read are almost four times as big as before
> the kernel upgrade.
> 
> The difference is that after the upgrade the driver sets the clock
> frequency to 25MHz, where before the upgrade it was set to 96MHz. Intel
> confirmed that the correct frequency for this network adapter is 96MHz.
> 
> Signed-off-by: Bernd Faust <berndfaust@xxxxxxxxx>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Tested-by: Aaron Brown <aaron.f.brown@xxxxxxxxx>