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

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Date:   Fri, 24 Mar 2017 00:43:12 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     Bernd Faust <berndfaust@...il.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "Lubetkin, YanirX" <yanirx.lubetkin@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] e1000e: fix timing for 82579 Gigabit Ethernet controller

> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Bernd Faust
> Sent: Thursday, February 16, 2017 10:42 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>; Lubetkin, YanirX
> <yanirx.lubetkin@...el.com>; intel-wired-lan@...ts.osuosl.org;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: Bernd Faust <berndfaust@...il.com>
> 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@...il.com>
> ---
>  drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++++++
>  1 file changed, 6 insertions(+)

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