netdev - [net-next 1/6] e1000e: Disable Far-End LoopBack following reset on 80003ES2LAN.

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Message-Id: <1335519413-1892-2-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Fri, 27 Apr 2012 02:36:48 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Matthew Vick <matthew.vick@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 1/6] e1000e: Disable Far-End LoopBack following reset on 80003ES2LAN.

From: Matthew Vick <matthew.vick@...el.com>

80003ES2LAN has an errata such that far-end loopback may be activated by
bit errors producing a reserved symbol. In order to disable far-end
loopback quickly enough, disable it immediately following a reset.

Signed-off-by: Matthew Vick <matthew.vick@...el.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/e1000e/80003es2lan.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/80003es2lan.c b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
index fbc84d4..a212846 100644
--- a/drivers/net/ethernet/intel/e1000e/80003es2lan.c
+++ b/drivers/net/ethernet/intel/e1000e/80003es2lan.c
@@ -764,6 +764,7 @@ static s32 e1000_reset_hw_80003es2lan(struct e1000_hw *hw)
 {
 	u32 ctrl;
 	s32 ret_val;
+	u16 kum_reg_data;
 
 	/*
 	 * Prevent the PCI-E bus from sticking if there is no TLP connection
@@ -789,6 +790,13 @@ static s32 e1000_reset_hw_80003es2lan(struct e1000_hw *hw)
 	ew32(CTRL, ctrl | E1000_CTRL_RST);
 	e1000_release_phy_80003es2lan(hw);
 
+	/* Disable IBIST slave mode (far-end loopback) */
+	e1000_read_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM,
+					&kum_reg_data);
+	kum_reg_data |= E1000_KMRNCTRLSTA_IBIST_DISABLE;
+	e1000_write_kmrn_reg_80003es2lan(hw, E1000_KMRNCTRLSTA_INBAND_PARAM,
+					 kum_reg_data);
+
 	ret_val = e1000e_get_auto_rd_done(hw);
 	if (ret_val)
 		/* We don't want to continue accessing MAC registers. */
-- 
1.7.7.6

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