igb: Power down link when interface is down
This changes the behavior of the driver to power down the link
when the associated interface is down, unless management is enabled.
Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/igb/e1000_phy.c b/drivers/net/igb/e1000_phy.c
index 3670a66..cf1f323 100644
--- a/drivers/net/igb/e1000_phy.c
+++ b/drivers/net/igb/e1000_phy.c
@@ -1931,6 +1931,41 @@
}
/**
+ * igb_power_up_phy_copper - Restore copper link in case of PHY power down
+ * @hw: pointer to the HW structure
+ *
+ * In the case of a PHY power down to save power, or to turn off link during a
+ * driver unload, restore the link to previous settings.
+ **/
+void igb_power_up_phy_copper(struct e1000_hw *hw)
+{
+ u16 mii_reg = 0;
+
+ /* The PHY will retain its settings across a power down/up cycle */
+ hw->phy.ops.read_reg(hw, PHY_CONTROL, &mii_reg);
+ mii_reg &= ~MII_CR_POWER_DOWN;
+ hw->phy.ops.write_reg(hw, PHY_CONTROL, mii_reg);
+}
+
+/**
+ * igb_power_down_phy_copper - Power down copper PHY
+ * @hw: pointer to the HW structure
+ *
+ * Power down PHY to save power when interface is down and wake on lan
+ * is not enabled.
+ **/
+void igb_power_down_phy_copper(struct e1000_hw *hw)
+{
+ u16 mii_reg = 0;
+
+ /* The PHY will retain its settings across a power down/up cycle */
+ hw->phy.ops.read_reg(hw, PHY_CONTROL, &mii_reg);
+ mii_reg |= MII_CR_POWER_DOWN;
+ hw->phy.ops.write_reg(hw, PHY_CONTROL, mii_reg);
+ msleep(1);
+}
+
+/**
* igb_check_polarity_82580 - Checks the polarity.
* @hw: pointer to the HW structure
*