igb: implement 580 MDI setting support

In order for igb to support MDI setting support via
ethtool this code is needed to allow setting the MDI state
via software.

This is in regards to the related ethtool patch

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Aaron Brown aaron.f.brown@intel.com
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igb/e1000_phy.c

@@ -464,6 +464,32 @@ s32 igb_copper_link_setup_82580(struct e1000_hw *hw)
 	phy_data |= I82580_CFG_ENABLE_DOWNSHIFT;
 
 	ret_val = phy->ops.write_reg(hw, I82580_CFG_REG, phy_data);
+	if (ret_val)
+		goto out;
+
+	/* Set MDI/MDIX mode */
+	ret_val = phy->ops.read_reg(hw, I82580_PHY_CTRL_2, &phy_data);
+	if (ret_val)
+		goto out;
+	phy_data &= ~I82580_PHY_CTRL2_MDIX_CFG_MASK;
+	/*
+	 * Options:
+	 *   0 - Auto (default)
+	 *   1 - MDI mode
+	 *   2 - MDI-X mode
+	 */
+	switch (hw->phy.mdix) {
+	case 1:
+		break;
+	case 2:
+		phy_data |= I82580_PHY_CTRL2_MANUAL_MDIX;
+		break;
+	case 0:
+	default:
+		phy_data |= I82580_PHY_CTRL2_AUTO_MDI_MDIX;
+		break;
+	}
+	ret_val = hw->phy.ops.write_reg(hw, I82580_PHY_CTRL_2, phy_data);
 
 out:
 	return ret_val;
@@ -2246,8 +2272,7 @@ s32 igb_phy_force_speed_duplex_82580(struct e1000_hw *hw)
 	if (ret_val)
 		goto out;
 
-	phy_data &= ~I82580_PHY_CTRL2_AUTO_MDIX;
-	phy_data &= ~I82580_PHY_CTRL2_FORCE_MDI_MDIX;
+	phy_data &= ~I82580_PHY_CTRL2_MDIX_CFG_MASK;
 
 	ret_val = phy->ops.write_reg(hw, I82580_PHY_CTRL_2, phy_data);
 	if (ret_val)

drivers/net/ethernet/intel/igb/e1000_phy.h

@@ -111,8 +111,9 @@ s32  igb_check_polarity_m88(struct e1000_hw *hw);
 #define I82580_PHY_STATUS2_SPEED_100MBPS  0x0100
 
 /* I82580 PHY Control 2 */
-#define I82580_PHY_CTRL2_AUTO_MDIX        0x0400
-#define I82580_PHY_CTRL2_FORCE_MDI_MDIX   0x0200
+#define I82580_PHY_CTRL2_MANUAL_MDIX      0x0200
+#define I82580_PHY_CTRL2_AUTO_MDI_MDIX    0x0400
+#define I82580_PHY_CTRL2_MDIX_CFG_MASK    0x0600
 
 /* I82580 PHY Diagnostics Status */
 #define I82580_DSTATUS_CABLE_LENGTH       0x03FC