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>

3 files changed, 41 insertions, 0 deletions

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 2b96ad0482ef..dbdaa332cac6 100644
--- a/drivers/net/e1000/e1000.h
+++ b/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;
 };
 
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 76e36a4fd985..ea18f3085f69 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/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);
diff --git a/drivers/net/e1000/e1000_param.c b/drivers/net/e1000/e1000_param.c
index e55f8969a0fb..a8d9295b0779 100644
--- a/drivers/net/e1000/e1000_param.c
+++ b/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: