1 files changed, 71 insertions, 5 deletions

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index ad08cf3f40c0..8b6ecd127889 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -138,6 +138,10 @@
 #define E1000_NVM_K1_CONFIG 0x1B /* NVM K1 Config Word */
 #define E1000_NVM_K1_ENABLE 0x1  /* NVM Enable K1 bit */
 
+/* KMRN Mode Control */
+#define HV_KMRN_MODE_CTRL      PHY_REG(769, 16)
+#define HV_KMRN_MDIO_SLOW      0x0400
+
 /* ICH GbE Flash Hardware Sequencing Flash Status Register bit breakdown */
 /* Offset 04h HSFSTS */
 union ich8_hws_flash_status {
@@ -219,6 +223,7 @@ static s32 e1000_set_lplu_state_pchlan(struct e1000_hw *hw, bool active);
 static void e1000_power_down_phy_copper_ich8lan(struct e1000_hw *hw);
 static void e1000_lan_init_done_ich8lan(struct e1000_hw *hw);
 static s32  e1000_k1_gig_workaround_hv(struct e1000_hw *hw, bool link);
+static s32 e1000_set_mdio_slow_mode_hv(struct e1000_hw *hw);
 
 static inline u16 __er16flash(struct e1000_hw *hw, unsigned long reg)
 {
@@ -270,7 +275,21 @@ static s32 e1000_init_phy_params_pchlan(struct e1000_hw *hw)
         phy->autoneg_mask             = AUTONEG_ADVERTISE_SPEED_DEFAULT;
 
         phy->id = e1000_phy_unknown;
-        e1000e_get_phy_id(hw);
+        ret_val = e1000e_get_phy_id(hw);
+        if (ret_val)
+                goto out;
+        if ((phy->id == 0) || (phy->id == PHY_REVISION_MASK)) {
+                /*
+                 * In case the PHY needs to be in mdio slow mode (eg. 82577),
+                 * set slow mode and try to get the PHY id again.
+                 */
+                ret_val = e1000_set_mdio_slow_mode_hv(hw);
+                if (ret_val)
+                        goto out;
+                ret_val = e1000e_get_phy_id(hw);
+                if (ret_val)
+                        goto out;
+        }
         phy->type = e1000e_get_phy_type_from_id(phy->id);
 
         switch (phy->type) {
@@ -292,6 +311,7 @@ static s32 e1000_init_phy_params_pchlan(struct e1000_hw *hw)
                 break;
         }
 
+out:
         return ret_val;
 }
 
@@ -1076,16 +1096,44 @@ out:
 
 
 /**
+ *  e1000_set_mdio_slow_mode_hv - Set slow MDIO access mode
+ *  @hw:   pointer to the HW structure
+ **/
+static s32 e1000_set_mdio_slow_mode_hv(struct e1000_hw *hw)
+{
+        s32 ret_val;
+        u16 data;
+
+        ret_val = e1e_rphy(hw, HV_KMRN_MODE_CTRL, &data);
+        if (ret_val)
+                return ret_val;
+
+        data |= HV_KMRN_MDIO_SLOW;
+
+        ret_val = e1e_wphy(hw, HV_KMRN_MODE_CTRL, data);
+
+        return ret_val;
+}
+
+/**
  *  e1000_hv_phy_workarounds_ich8lan - A series of Phy workarounds to be
  *  done after every PHY reset.
  **/
 static s32 e1000_hv_phy_workarounds_ich8lan(struct e1000_hw *hw)
 {
         s32 ret_val = 0;
+        u16 phy_data;
 
         if (hw->mac.type != e1000_pchlan)
                 return ret_val;
 
+        /* Set MDIO slow mode before any other MDIO access */
+        if (hw->phy.type == e1000_phy_82577) {
+                ret_val = e1000_set_mdio_slow_mode_hv(hw);
+                if (ret_val)
+                        goto out;
+        }
+
         if (((hw->phy.type == e1000_phy_82577) &&
              ((hw->phy.revision == 1) || (hw->phy.revision == 2))) ||
             ((hw->phy.type == e1000_phy_82578) && (hw->phy.revision == 1))) {
@@ -1118,16 +1166,32 @@ static s32 e1000_hv_phy_workarounds_ich8lan(struct e1000_hw *hw)
 
         hw->phy.addr = 1;
         ret_val = e1000e_write_phy_reg_mdic(hw, IGP01E1000_PHY_PAGE_SELECT, 0);
+        hw->phy.ops.release(hw);
         if (ret_val)
                 goto out;
-        hw->phy.ops.release(hw);
 
         /*
          * Configure the K1 Si workaround during phy reset assuming there is
          * link so that it disables K1 if link is in 1Gbps.
          */
         ret_val = e1000_k1_gig_workaround_hv(hw, true);
+        if (ret_val)
+                goto out;
 
+        /* Workaround for link disconnects on a busy hub in half duplex */
+        ret_val = hw->phy.ops.acquire(hw);
+        if (ret_val)
+                goto out;
+        ret_val = hw->phy.ops.read_reg_locked(hw,
+                                              PHY_REG(BM_PORT_CTRL_PAGE, 17),
+                                              &phy_data);
+        if (ret_val)
+                goto release;
+        ret_val = hw->phy.ops.write_reg_locked(hw,
+                                               PHY_REG(BM_PORT_CTRL_PAGE, 17),
+                                               phy_data & 0x00FF);
+release:
+        hw->phy.ops.release(hw);
 out:
         return ret_val;
 }
@@ -1184,6 +1248,7 @@ static s32 e1000_phy_hw_reset_ich8lan(struct e1000_hw *hw)
         /* Allow time for h/w to get to a quiescent state after reset */
         mdelay(10);
 
+        /* Perform any necessary post-reset workarounds */
         if (hw->mac.type == e1000_pchlan) {
                 ret_val = e1000_hv_phy_workarounds_ich8lan(hw);
                 if (ret_val)
@@ -2484,6 +2549,10 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
         if (!ret_val)
                 e1000_release_swflag_ich8lan(hw);
 
+        /* Perform any necessary post-reset workarounds */
+        if (hw->mac.type == e1000_pchlan)
+                ret_val = e1000_hv_phy_workarounds_ich8lan(hw);
+
         if (ctrl & E1000_CTRL_PHY_RST)
                 ret_val = hw->phy.ops.get_cfg_done(hw);
 
@@ -2528,9 +2597,6 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
         kab |= E1000_KABGTXD_BGSQLBIAS;
         ew32(KABGTXD, kab);
 
-        if (hw->mac.type == e1000_pchlan)
-                ret_val = e1000_hv_phy_workarounds_ich8lan(hw);
-
 out:
         return ret_val;
 }