e1000: add smart power down code

Smart Power Down is a power saving feature in newer e1000 hardware. We
disable it because it causes time to link to be long, but make it a
user choice.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>

drivers/net/e1000/e1000.h

@@ -338,6 +338,7 @@ struct e1000_adapter {
 #ifdef NETIF_F_TSO
 	boolean_t tso_force;
 #endif
+	boolean_t smart_power_down;	/* phy smart power down */
 	unsigned long flags;
 };
 

drivers/net/e1000/e1000_main.c

@@ -607,6 +607,21 @@ e1000_reset(struct e1000_adapter *adapter)
 
 	e1000_reset_adaptive(&adapter->hw);
 	e1000_phy_get_info(&adapter->hw, &adapter->phy_info);
+
+	if (!adapter->smart_power_down &&
+	    (adapter->hw.mac_type == e1000_82571 ||
+	     adapter->hw.mac_type == e1000_82572)) {
+		uint16_t phy_data = 0;
+		/* speed up time to link by disabling smart power down, ignore
+		 * the return value of this function because there is nothing
+		 * different we would do if it failed */
+		e1000_read_phy_reg(&adapter->hw, IGP02E1000_PHY_POWER_MGMT,
+		                   &phy_data);
+		phy_data &= ~IGP02E1000_PM_SPD;
+		e1000_write_phy_reg(&adapter->hw, IGP02E1000_PHY_POWER_MGMT,
+		                    phy_data);
+	}
+
 	if (adapter->en_mng_pt) {
 		manc = E1000_READ_REG(&adapter->hw, MANC);
 		manc |= (E1000_MANC_ARP_EN | E1000_MANC_EN_MNG2HOST);

drivers/net/e1000/e1000_param.c

@@ -183,6 +183,15 @@ E1000_PARAM(RxAbsIntDelay, "Receive Absolute Interrupt Delay");
 
 E1000_PARAM(InterruptThrottleRate, "Interrupt Throttling Rate");
 
+/* Enable Smart Power Down of the PHY
+ *
+ * Valid Range: 0, 1
+ *
+ * Default Value: 0 (disabled)
+ */
+
+E1000_PARAM(SmartPowerDownEnable, "Enable PHY smart power down");
+
 #define AUTONEG_ADV_DEFAULT  0x2F
 #define AUTONEG_ADV_MASK     0x2F
 #define FLOW_CONTROL_DEFAULT FLOW_CONTROL_FULL
@@ -494,6 +503,22 @@ e1000_check_options(struct e1000_adapter *adapter)
 			adapter->itr = opt.def;
 		}
 	}
+	{ /* Smart Power Down */
+		struct e1000_option opt = {
+			.type = enable_option,
+			.name = "PHY Smart Power Down",
+			.err  = "defaulting to Disabled",
+			.def  = OPTION_DISABLED
+		};
+
+		if (num_SmartPowerDownEnable > bd) {
+			int spd = SmartPowerDownEnable[bd];
+			e1000_validate_option(&spd, &opt, adapter);
+			adapter->smart_power_down = spd;
+		} else {
+			adapter->smart_power_down = opt.def;
+		}
+	}
 
 	switch (adapter->hw.media_type) {
 	case e1000_media_type_fiber: