From: Tony Nguyen <anthony.l.nguyen@intel.com>
Date: Wed, 7 Jun 2017 14:36:18 -0700
Subject: ixgbe: Enable LASI interrupts for X552 devices
Patch-mainline: v4.14-rc1
Git-commit: 72f740b1013783c81da928cfe2ac82dd767c74f0
References: bsc#1056657 FATE#322189 bsc#1056653 FATE#322190

Enable LASI interrupts on X552 devices in order to receive notifications of
link configurations of the external PHY and support the configuration of
the internal iXFI link since iXFI does not support auto-negotiation.  This
is not required for X553 devices; add a check to avoid enabling LASI
interrupts for X553 devices.

Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Benjamin Poirier <bpoirier@suse.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c |   31 ++++++++++++++++++--------
 1 file changed, 22 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -2404,17 +2404,30 @@ static s32 ixgbe_enable_lasi_ext_t_x550e
 	status = ixgbe_get_lasi_ext_t_x550em(hw, &lsc);
 
 	/* Enable link status change alarm */
-	status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_PMA_TX_VEN_LASI_INT_MASK,
-				      MDIO_MMD_AN, &reg);
-	if (status)
-		return status;
 
-	reg |= IXGBE_MDIO_PMA_TX_VEN_LASI_INT_EN;
+	/* Enable the LASI interrupts on X552 devices to receive notifications
+	 * of the link configurations of the external PHY and correspondingly
+	 * support the configuration of the internal iXFI link, since iXFI does
+	 * not support auto-negotiation. This is not required for X553 devices
+	 * having KR support, which performs auto-negotiations and which is used
+	 * as the internal link to the external PHY. Hence adding a check here
+	 * to avoid enabling LASI interrupts for X553 devices.
+	 */
+	if (hw->mac.type != ixgbe_mac_x550em_a) {
+		status = hw->phy.ops.read_reg(hw,
+					    IXGBE_MDIO_PMA_TX_VEN_LASI_INT_MASK,
+					    MDIO_MMD_AN, &reg);
+		if (status)
+			return status;
 
-	status = hw->phy.ops.write_reg(hw, IXGBE_MDIO_PMA_TX_VEN_LASI_INT_MASK,
-				       MDIO_MMD_AN, reg);
-	if (status)
-		return status;
+		reg |= IXGBE_MDIO_PMA_TX_VEN_LASI_INT_EN;
+
+		status = hw->phy.ops.write_reg(hw,
+					    IXGBE_MDIO_PMA_TX_VEN_LASI_INT_MASK,
+					    MDIO_MMD_AN, reg);
+		if (status)
+			return status;
+	}
 
 	/* Enable high temperature failure and global fault alarms */
 	status = hw->phy.ops.read_reg(hw, IXGBE_MDIO_GLOBAL_INT_MASK,