igb: Support to enable EEE on all eee_supported devices

Current implementation enables EEE on only i350 device. This patch enables
EEE on all eee_supported devices. Also, configured LPI clock to keep
running before EEE is enabled on i210 and i211 devices.

Signed-off-by: Akeem G. Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: Jeff Pieper  <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igb/e1000_82575.c

@@ -2223,11 +2223,10 @@ out:
 s32 igb_set_eee_i350(struct e1000_hw *hw)
 {
 	s32 ret_val = 0;
-	u32 ipcnfg, eeer, ctrl_ext;
+	u32 ipcnfg, eeer;
 
-	ctrl_ext = rd32(E1000_CTRL_EXT);
-	if ((hw->mac.type != e1000_i350) ||
-	    (ctrl_ext & E1000_CTRL_EXT_LINK_MODE_MASK))
+	if ((hw->mac.type < e1000_i350) ||
+	    (hw->phy.media_type != e1000_media_type_copper))
 		goto out;
 	ipcnfg = rd32(E1000_IPCNFG);
 	eeer = rd32(E1000_EEER);
@@ -2240,6 +2239,14 @@ s32 igb_set_eee_i350(struct e1000_hw *hw)
 			E1000_EEER_RX_LPI_EN |
 			E1000_EEER_LPI_FC);
 
+		/* keep the LPI clock running before EEE is enabled */
+		if (hw->mac.type == e1000_i210 || hw->mac.type == e1000_i211) {
+			u32 eee_su;
+			eee_su = rd32(E1000_EEE_SU);
+			eee_su &= ~E1000_EEE_SU_LPI_CLK_STP;
+			wr32(E1000_EEE_SU, eee_su);
+		}
+
 	} else {
 		ipcnfg &= ~(E1000_IPCNFG_EEE_1G_AN |
 			E1000_IPCNFG_EEE_100M_AN);
@@ -2249,6 +2256,8 @@ s32 igb_set_eee_i350(struct e1000_hw *hw)
 	}
 	wr32(E1000_IPCNFG, ipcnfg);
 	wr32(E1000_EEER, eeer);
+	rd32(E1000_IPCNFG);
+	rd32(E1000_EEER);
 out:
 
 	return ret_val;

drivers/net/ethernet/intel/igb/e1000_defines.h

@@ -857,8 +857,9 @@
 #define E1000_IPCNFG_EEE_100M_AN     0x00000004  /* EEE Enable 100M AN */
 #define E1000_EEER_TX_LPI_EN         0x00010000  /* EEE Tx LPI Enable */
 #define E1000_EEER_RX_LPI_EN         0x00020000  /* EEE Rx LPI Enable */
-#define E1000_EEER_FRC_AN            0x10000000 /* Enable EEE in loopback */
+#define E1000_EEER_FRC_AN            0x10000000  /* Enable EEE in loopback */
 #define E1000_EEER_LPI_FC            0x00040000  /* EEE Enable on FC */
+#define E1000_EEE_SU_LPI_CLK_STP     0X00800000  /* EEE LPI Clock Stop */
 
 /* SerDes Control */
 #define E1000_GEN_CTL_READY             0x80000000

drivers/net/ethernet/intel/igb/e1000_regs.h

@@ -349,6 +349,7 @@
 /* Energy Efficient Ethernet "EEE" register */
 #define E1000_IPCNFG  0x0E38  /* Internal PHY Configuration */
 #define E1000_EEER    0x0E30  /* Energy Efficient Ethernet */
+#define E1000_EEE_SU  0X0E34  /* EEE Setup */
 
 /* Thermal Sensor Register */
 #define E1000_THSTAT    0x08110 /* Thermal Sensor Status */