This is a note to let you know that I've just added the patch titled
e1000e: fix timing for 82579 Gigabit Ethernet controller
to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: e1000e-fix-timing-for-82579-gigabit-ethernet-controller.patch and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Thu Mar 22 15:16:04 CET 2018
From: Bernd Faust berndfaust@gmail.com Date: Thu, 16 Feb 2017 19:42:07 +0100 Subject: e1000e: fix timing for 82579 Gigabit Ethernet controller
From: Bernd Faust berndfaust@gmail.com
[ Upstream commit 5313eeccd2d7f486be4e5c7560e3e2be239ec8f7 ]
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@gmail.com Acked-by: Sasha Neftin sasha.neftin@intel.com Acked-by: Jacob Keller jacob.e.keller@intel.com Tested-by: Aaron Brown aaron.f.brown@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -3507,6 +3507,12 @@ s32 e1000e_get_base_timinca(struct e1000
switch (hw->mac.type) { case e1000_pch2lan: + /* Stable 96MHz frequency */ + incperiod = INCPERIOD_96MHz; + incvalue = INCVALUE_96MHz; + shift = INCVALUE_SHIFT_96MHz; + adapter->cc.shift = shift + INCPERIOD_SHIFT_96MHz; + break; case e1000_pch_lpt: /* On I217, the clock frequency is 25MHz or 96MHz as * indicated by the System Clock Frequency Indication
Patches currently in stable-queue which might be from berndfaust@gmail.com are
queue-3.18/e1000e-fix-timing-for-82579-gigabit-ethernet-controller.patch