Patch "e1000e: fix timing for 82579 Gigabit Ethernet controller" has been added to the 4.9-stable tree

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 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     e1000e-fix-timing-for-82579-gigabit-ethernet-controller.patch

and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Bernd Faust <[email protected]>
Date: Thu, 16 Feb 2017 19:42:07 +0100
Subject: e1000e: fix timing for 82579 Gigabit Ethernet controller

From: Bernd Faust <[email protected]>

[ 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.

---
 drivers/net/ethernet/intel/e1000e/netdev.c |    6 ++++++
 1 file changed, 6 insertions(+)

@@ -3528,6 +3528,12 @@ 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:
 		if (er32(TSYNCRXCTL) & E1000_TSYNCRXCTL_SYSCFI) {
 			/* Stable 96MHz frequency */

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/e1000e-fix-timing-for-82579-gigabit-ethernet-controller.patch