igb: reset PHY after recovering from PHY power down

According to 82576_Datasheet.pdf, PHY setting is lost after PHY power down.
So resetting PHY is needed when recovering from PHY power down to set a default
setting to PHY register.
Owing to this lack, NIC doesn't link up in some rare situation.

Signed-off-by: Koki Sanagi <[email protected]>
Tested-by: Aaron Brown <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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

@@ -1507,6 +1507,7 @@ void igb_power_up_link(struct igb_adapter *adapter)
 		igb_power_up_phy_copper(&adapter->hw);
 	else
 		igb_power_up_serdes_link_82575(&adapter->hw);
+	igb_reset_phy(&adapter->hw);
 }
 
 /**