ixgbe: Add X553 FW ALEF support

This patch add X553 FW ALEF support for B0.  ALEF is the new unified
FW.  This contains updated register defines for ALEF speed
configuration.  Likewise it also removes the AN_CNTL_8 usage from
the native SFI flow as it is no longer supported by FW.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 0c65814f5803e5dd6bec585081fc77b115f0592b..5dadae60fe23ecf71a4b320cfe5ce25f89d772cc 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -242,6 +242,42 @@ fail:
        return IXGBE_ERR_I2C;
 }
 
+/**
+ *  ixgbe_probe_phy - Probe a single address for a PHY
+ *  @hw: pointer to hardware structure
+ *  @phy_addr: PHY address to probe
+ *
+ *  Returns true if PHY found
+ **/
+static bool ixgbe_probe_phy(struct ixgbe_hw *hw, u16 phy_addr)
+{
+       u16 ext_ability = 0;
+
+       hw->phy.mdio.prtad = phy_addr;
+       if (mdio45_probe(&hw->phy.mdio, phy_addr) != 0)
+               return false;
+
+       if (ixgbe_get_phy_id(hw))
+               return false;
+
+       hw->phy.type = ixgbe_get_phy_type_from_id(hw->phy.id);
+
+       if (hw->phy.type == ixgbe_phy_unknown) {
+               hw->phy.ops.read_reg(hw,
+                                    MDIO_PMA_EXTABLE,
+                                    MDIO_MMD_PMAPMD,
+                                    &ext_ability);
+               if (ext_ability &
+                   (MDIO_PMA_EXTABLE_10GBT |
+                    MDIO_PMA_EXTABLE_1000BT))
+                       hw->phy.type = ixgbe_phy_cu_unknown;
+               else
+                       hw->phy.type = ixgbe_phy_generic;
+       }
+
+       return true;
+}
+
 /**
  *  ixgbe_identify_phy_generic - Get physical layer module
  *  @hw: pointer to hardware structure
@@ -251,7 +287,7 @@ fail:
 s32 ixgbe_identify_phy_generic(struct ixgbe_hw *hw)
 {
        u32 phy_addr;
-       u16 ext_ability = 0;
+       u32 status = IXGBE_ERR_PHY_ADDR_INVALID;
 
        if (!hw->phy.phy_semaphore_mask) {
                if (hw->bus.lan_id)
@@ -260,37 +296,34 @@ s32 ixgbe_identify_phy_generic(struct ixgbe_hw *hw)
                        hw->phy.phy_semaphore_mask = IXGBE_GSSR_PHY0_SM;
        }
 
-       if (hw->phy.type == ixgbe_phy_unknown) {
-               for (phy_addr = 0; phy_addr < IXGBE_MAX_PHY_ADDR; phy_addr++) {
-                       hw->phy.mdio.prtad = phy_addr;
-                       if (mdio45_probe(&hw->phy.mdio, phy_addr) == 0) {
-                               ixgbe_get_phy_id(hw);
-                               hw->phy.type =
-                                       ixgbe_get_phy_type_from_id(hw->phy.id);
-
-                               if (hw->phy.type == ixgbe_phy_unknown) {
-                                       hw->phy.ops.read_reg(hw,
-                                                            MDIO_PMA_EXTABLE,
-                                                            MDIO_MMD_PMAPMD,
-                                                            &ext_ability);
-                                       if (ext_ability &
-                                           (MDIO_PMA_EXTABLE_10GBT |
-                                            MDIO_PMA_EXTABLE_1000BT))
-                                               hw->phy.type =
-                                                        ixgbe_phy_cu_unknown;
-                                       else
-                                               hw->phy.type =
-                                                        ixgbe_phy_generic;
-                               }
+       if (hw->phy.type != ixgbe_phy_unknown)
+               return 0;
 
-                               return 0;
-                       }
+       if (hw->phy.nw_mng_if_sel) {
+               phy_addr = (hw->phy.nw_mng_if_sel &
+                           IXGBE_NW_MNG_IF_SEL_MDIO_PHY_ADD) >>
+                          IXGBE_NW_MNG_IF_SEL_MDIO_PHY_ADD_SHIFT;
+               if (ixgbe_probe_phy(hw, phy_addr))
+                       return 0;
+               else
+                       return IXGBE_ERR_PHY_ADDR_INVALID;
+       }
+
+       for (phy_addr = 0; phy_addr < IXGBE_MAX_PHY_ADDR; phy_addr++) {
+               if (ixgbe_probe_phy(hw, phy_addr)) {
+                       status = 0;
+                       break;
                }
-               /* indicate no PHY found */
-               hw->phy.mdio.prtad = MDIO_PRTAD_NONE;
-               return IXGBE_ERR_PHY_ADDR_INVALID;
        }
-       return 0;
+
+       /* Certain media types do not have a phy so an address will not
+        * be found and the code will take this path.  Caller has to
+        * decide if it is an error or not.
+        */
+       if (status)
+               hw->phy.mdio.prtad = MDIO_PRTAD_NONE;
+
+       return status;
 }
 
 /**
@@ -367,6 +400,7 @@ static enum ixgbe_phy_type ixgbe_get_phy_type_from_id(u32 phy_id)
                phy_type = ixgbe_phy_nl;
                break;
        case X557_PHY_ID:
+       case X557_PHY_ID2:
                phy_type = ixgbe_phy_x550em_ext_t;
                break;
        default:
@@ -417,8 +451,7 @@ s32 ixgbe_reset_phy_generic(struct ixgbe_hw *hw)
         */
        for (i = 0; i < 30; i++) {
                msleep(100);
-               hw->phy.ops.read_reg(hw, MDIO_CTRL1,
-                                    MDIO_MMD_PHYXS, &ctrl);
+               hw->phy.ops.read_reg(hw, MDIO_CTRL1, MDIO_MMD_PHYXS, &ctrl);
                if (!(ctrl & MDIO_CTRL1_RESET)) {
                        udelay(2);
                        break;
@@ -769,6 +802,7 @@ static s32 ixgbe_get_copper_speeds_supported(struct ixgbe_hw *hw)
                hw->phy.speeds_supported |= IXGBE_LINK_SPEED_5GB_FULL;
                break;
        case ixgbe_mac_X550EM_x:
+       case ixgbe_mac_x550em_a:
                hw->phy.speeds_supported &= ~IXGBE_LINK_SPEED_100_FULL;
                break;
        default:

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index fe9c6ae41a353b996c5017d4fe66dc7cfff1aaae..856152fac4bbf526a6b248410e2ed2d3af8c254c 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -1379,6 +1379,7 @@ struct ixgbe_thermal_sensor_data {
 #define X540_PHY_ID      0x01540200
 #define X550_PHY_ID      0x01540220
 #define X557_PHY_ID      0x01540240
+#define X557_PHY_ID2   0x01540250
 #define QT2022_PHY_ID    0x0043A400
 #define ATH_PHY_ID       0x03429050
 #define AQ_FW_REV        0x20
@@ -3604,9 +3605,25 @@ struct ixgbe_info {
 #define IXGBE_KRM_DSP_TXFFE_STATE_5(P) ((P) ? 0x8638 : 0x4638)
 #define IXGBE_KRM_RX_TRN_LINKUP_CTRL(P)        ((P) ? 0x8B00 : 0x4B00)
 #define IXGBE_KRM_PMD_DFX_BURNIN(P)    ((P) ? 0x8E00 : 0x4E00)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20(P) ((P) ? 0x9054 : 0x5054)
 #define IXGBE_KRM_TX_COEFF_CTRL_1(P)   ((P) ? 0x9520 : 0x5520)
 #define IXGBE_KRM_RX_ANA_CTL(P)                ((P) ? 0x9A00 : 0x5A00)
 
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_DA         ~(0x3 << 20)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_SR         BIT(20)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_LR         (0x2 << 20)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SGMII_EN           BIT(25)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_AN37_EN            BIT(26)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_AN_EN              BIT(27)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_10M          ~(0x7 << 28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_100M         BIT(28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_1G           (0x2 << 28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_10G          (0x3 << 28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_AN           (0x4 << 28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_2_5G         (0x7 << 28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_MASK         (0x7 << 28)
+#define IXGBE_KRM_PMD_FLX_MASK_ST20_FW_AN_RESTART      BIT(31)
+
 #define IXGBE_KRM_PORT_CAR_GEN_CTRL_NELB_32B           BIT(9)
 #define IXGBE_KRM_PORT_CAR_GEN_CTRL_NELB_KRPCS         BIT(11)
 

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index 252e52d7c03db9d144dd44c5f01e04ee05778966..11fb433eb924ef7f1771400db4c6e69c10354c6c 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -1281,6 +1281,53 @@ static s32 ixgbe_setup_ixfi_x550em_x(struct ixgbe_hw *hw)
        return status;
 }
 
+/**
+ *  ixgbe_restart_an_internal_phy_x550em - restart autonegotiation for the
+ *  internal PHY
+ *  @hw: pointer to hardware structure
+ **/
+static s32 ixgbe_restart_an_internal_phy_x550em(struct ixgbe_hw *hw)
+{
+       s32 status;
+       u32 link_ctrl;
+
+       /* Restart auto-negotiation. */
+       status = hw->mac.ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &link_ctrl);
+
+       if (status) {
+               hw_dbg(hw, "Auto-negotiation did not complete\n");
+               return status;
+       }
+
+       link_ctrl |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART;
+       status = hw->mac.ops.write_iosf_sb_reg(hw,
+                               IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, link_ctrl);
+
+       if (hw->mac.type == ixgbe_mac_x550em_a) {
+               u32 flx_mask_st20;
+
+               /* Indicate to FW that AN restart has been asserted */
+               status = hw->mac.ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &flx_mask_st20);
+
+               if (status) {
+                       hw_dbg(hw, "Auto-negotiation did not complete\n");
+                       return status;
+               }
+
+               flx_mask_st20 |= IXGBE_KRM_PMD_FLX_MASK_ST20_FW_AN_RESTART;
+               status = hw->mac.ops.write_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, flx_mask_st20);
+       }
+
+       return status;
+}
+
 /** ixgbe_setup_ixfi_x550em - Configure the KR PHY for iXFI mode.
  *  @hw: pointer to hardware structure
  *  @speed: the link speed to force
@@ -1330,16 +1377,7 @@ static s32 ixgbe_setup_ixfi_x550em(struct ixgbe_hw *hw, ixgbe_link_speed *speed)
        }
 
        /* Toggle port SW reset by AN reset. */
-       status = ixgbe_read_iosf_sb_reg_x550(hw,
-                               IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
-                               IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
-       if (status)
-               return status;
-
-       reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART;
-       status = ixgbe_write_iosf_sb_reg_x550(hw,
-                               IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
-                               IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+       status = ixgbe_restart_an_internal_phy_x550em(hw);
 
        return status;
 }
@@ -1422,6 +1460,55 @@ ixgbe_setup_mac_link_sfp_x550em(struct ixgbe_hw *hw,
        return status;
 }
 
+/**
+ * ixgbe_setup_sfi_x550a - Configure the internal PHY for native SFI mode
+ * @hw: pointer to hardware structure
+ * @speed: the link speed to force
+ *
+ * Configures the integrated PHY for native SFI mode. Used to connect the
+ * internal PHY directly to an SFP cage, without autonegotiation.
+ **/
+static s32 ixgbe_setup_sfi_x550a(struct ixgbe_hw *hw, ixgbe_link_speed *speed)
+{
+       struct ixgbe_mac_info *mac = &hw->mac;
+       s32 status;
+       u32 reg_val;
+
+       /* Disable all AN and force speed to 10G Serial. */
+       status = mac->ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+       if (status)
+               return status;
+
+       reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_AN_EN;
+       reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_AN37_EN;
+       reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_SGMII_EN;
+       reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_MASK;
+
+       /* Select forced link speed for internal PHY. */
+       switch (*speed) {
+       case IXGBE_LINK_SPEED_10GB_FULL:
+               reg_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_10G;
+               break;
+       case IXGBE_LINK_SPEED_1GB_FULL:
+               reg_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_1G;
+               break;
+       default:
+               /* Other link speeds are not supported by internal PHY. */
+               return IXGBE_ERR_LINK_SETUP;
+       }
+
+       status = mac->ops.write_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+
+       /* Toggle port SW reset by AN reset. */
+       status = ixgbe_restart_an_internal_phy_x550em(hw);
+
+       return status;
+}
+
 /**
  * ixgbe_setup_mac_link_sfp_n - Setup internal PHY for native SFP
  * @hw: pointer to hardware structure
@@ -1434,45 +1521,39 @@ ixgbe_setup_mac_link_sfp_n(struct ixgbe_hw *hw, ixgbe_link_speed speed,
 {
        bool setup_linear = false;
        u32 reg_phy_int;
-       s32 rc;
+       s32 ret_val;
 
        /* Check if SFP module is supported and linear */
-       rc = ixgbe_supported_sfp_modules_X550em(hw, &setup_linear);
+       ret_val = ixgbe_supported_sfp_modules_X550em(hw, &setup_linear);
 
        /* If no SFP module present, then return success. Return success since
         * SFP not present error is not excepted in the setup MAC link flow.
         */
-       if (rc == IXGBE_ERR_SFP_NOT_PRESENT)
+       if (ret_val == IXGBE_ERR_SFP_NOT_PRESENT)
                return 0;
 
-       if (!rc)
-               return rc;
+       if (!ret_val)
+               return ret_val;
 
-       /* Configure internal PHY for native SFI */
-       rc = hw->mac.ops.read_iosf_sb_reg(hw,
-                                         IXGBE_KRM_AN_CNTL_8(hw->bus.lan_id),
-                                         IXGBE_SB_IOSF_TARGET_KR_PHY,
-                                         &reg_phy_int);
-       if (rc)
-               return rc;
+       /* Configure internal PHY for native SFI based on module type */
+       ret_val = hw->mac.ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_phy_int);
+       if (!ret_val)
+               return ret_val;
 
-       if (setup_linear) {
-               reg_phy_int &= ~IXGBE_KRM_AN_CNTL_8_LIMITING;
-               reg_phy_int |= IXGBE_KRM_AN_CNTL_8_LINEAR;
-       } else {
-               reg_phy_int |= IXGBE_KRM_AN_CNTL_8_LIMITING;
-               reg_phy_int &= ~IXGBE_KRM_AN_CNTL_8_LINEAR;
-       }
+       reg_phy_int &= IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_DA;
+       if (!setup_linear)
+               reg_phy_int |= IXGBE_KRM_PMD_FLX_MASK_ST20_SFI_10G_SR;
 
-       rc = hw->mac.ops.write_iosf_sb_reg(hw,
-                                          IXGBE_KRM_AN_CNTL_8(hw->bus.lan_id),
-                                          IXGBE_SB_IOSF_TARGET_KR_PHY,
-                                          reg_phy_int);
-       if (rc)
-               return rc;
+       ret_val = hw->mac.ops.write_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, reg_phy_int);
+       if (!ret_val)
+               return ret_val;
 
-       /* Setup XFI/SFI internal link */
-       return ixgbe_setup_ixfi_x550em(hw, &speed);
+       /* Setup SFI internal link. */
+       return ixgbe_setup_sfi_x550a(hw, &speed);
 }
 
 /**
@@ -1488,19 +1569,19 @@ ixgbe_setup_mac_link_sfp_x550a(struct ixgbe_hw *hw, ixgbe_link_speed speed,
        u32 reg_slice, slice_offset;
        bool setup_linear = false;
        u16 reg_phy_ext;
-       s32 rc;
+       s32 ret_val;
 
        /* Check if SFP module is supported and linear */
-       rc = ixgbe_supported_sfp_modules_X550em(hw, &setup_linear);
+       ret_val = ixgbe_supported_sfp_modules_X550em(hw, &setup_linear);
 
        /* If no SFP module present, then return success. Return success since
         * SFP not present error is not excepted in the setup MAC link flow.
         */
-       if (rc == IXGBE_ERR_SFP_NOT_PRESENT)
+       if (ret_val == IXGBE_ERR_SFP_NOT_PRESENT)
                return 0;
 
-       if (!rc)
-               return rc;
+       if (!ret_val)
+               return ret_val;
 
        /* Configure internal PHY for KR/KX. */
        ixgbe_setup_kr_speed_x550em(hw, speed);
@@ -1509,10 +1590,10 @@ ixgbe_setup_mac_link_sfp_x550a(struct ixgbe_hw *hw, ixgbe_link_speed speed,
                return IXGBE_ERR_PHY_ADDR_INVALID;
 
        /* Get external PHY device id */
-       rc = hw->phy.ops.read_reg(hw, IXGBE_CS4227_GLOBAL_ID_MSB,
+       ret_val = hw->phy.ops.read_reg(hw, IXGBE_CS4227_GLOBAL_ID_MSB,
                                  IXGBE_MDIO_ZERO_DEV_TYPE, &reg_phy_ext);
-       if (rc)
-               return rc;
+       if (ret_val)
+               return ret_val;
 
        /* When configuring quad port CS4223, the MAC instance is part
         * of the slice offset.
@@ -1625,7 +1706,7 @@ ixgbe_setup_sgmii(struct ixgbe_hw *hw, __always_unused ixgbe_link_speed speed,
                  __always_unused bool autoneg_wait_to_complete)
 {
        struct ixgbe_mac_info *mac = &hw->mac;
-       u32 lval, sval;
+       u32 lval, sval, flx_val;
        s32 rc;
 
        rc = mac->ops.read_iosf_sb_reg(hw,
@@ -1659,11 +1740,31 @@ ixgbe_setup_sgmii(struct ixgbe_hw *hw, __always_unused ixgbe_link_speed speed,
        if (rc)
                return rc;
 
-       lval |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART;
+       rc = mac->ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &flx_val);
+       if (rc)
+               return rc;
+
+       rc = mac->ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &flx_val);
+       if (rc)
+               return rc;
+
+       flx_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_MASK;
+       flx_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_1G;
+       flx_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_AN_EN;
+       flx_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_SGMII_EN;
+       flx_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_AN37_EN;
+
        rc = mac->ops.write_iosf_sb_reg(hw,
-                                       IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
-                                       IXGBE_SB_IOSF_TARGET_KR_PHY, lval);
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, flx_val);
+       if (rc)
+               return rc;
 
+       rc = ixgbe_restart_an_internal_phy_x550em(hw);
        return rc;
 }
 
@@ -2020,13 +2121,31 @@ static s32 ixgbe_setup_kr_speed_x550em(struct ixgbe_hw *hw,
        if (speed & IXGBE_LINK_SPEED_1GB_FULL)
                reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_CAP_KX;
 
-       /* Restart auto-negotiation. */
-       reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART;
        status = hw->mac.ops.write_iosf_sb_reg(hw,
                                        IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
                                        IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
 
-       return status;
+       if (hw->mac.type == ixgbe_mac_x550em_a) {
+               /* Set lane mode  to KR auto negotiation */
+               status = hw->mac.ops.read_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, &reg_val);
+
+               if (status)
+                       return status;
+
+               reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_MASK;
+               reg_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_SPEED_AN;
+               reg_val |= IXGBE_KRM_PMD_FLX_MASK_ST20_AN_EN;
+               reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_AN37_EN;
+               reg_val &= ~IXGBE_KRM_PMD_FLX_MASK_ST20_SGMII_EN;
+
+               status = hw->mac.ops.write_iosf_sb_reg(hw,
+                               IXGBE_KRM_PMD_FLX_MASK_ST20(hw->bus.lan_id),
+                               IXGBE_SB_IOSF_TARGET_KR_PHY, reg_val);
+       }
+
+       return ixgbe_restart_an_internal_phy_x550em(hw);
 }
 
 /** ixgbe_setup_kx4_x550em - Configure the KX4 PHY.
@@ -2894,7 +3013,6 @@ static void ixgbe_set_source_address_pruning_X550(struct ixgbe_hw *hw,
 static s32 ixgbe_setup_fc_backplane_x550em_a(struct ixgbe_hw *hw)
 {
        s32 status = 0;
-       u32 link_ctrl = 0;
        u32 an_cntl = 0;
 
        /* Validate the requested mode */
@@ -2965,18 +3083,7 @@ static s32 ixgbe_setup_fc_backplane_x550em_a(struct ixgbe_hw *hw)
                                        IXGBE_SB_IOSF_TARGET_KR_PHY, an_cntl);
 
        /* Restart auto-negotiation. */
-       status = hw->mac.ops.read_iosf_sb_reg(hw,
-                               IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
-                               IXGBE_SB_IOSF_TARGET_KR_PHY, &link_ctrl);
-       if (status) {
-               hw_dbg(hw, "Auto-Negotiation did not complete\n");
-               return status;
-       }
-
-       link_ctrl |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_RESTART;
-       status = hw->mac.ops.write_iosf_sb_reg(hw,
-                               IXGBE_KRM_LINK_CTRL_1(hw->bus.lan_id),
-                               IXGBE_SB_IOSF_TARGET_KR_PHY, link_ctrl);
+       status = ixgbe_restart_an_internal_phy_x550em(hw);
 
        return status;
 }
@@ -3243,7 +3350,7 @@ static struct ixgbe_mac_operations mac_ops_x550em_a = {
        .acquire_swfw_sync      = ixgbe_acquire_swfw_sync_x550em_a,
        .release_swfw_sync      = ixgbe_release_swfw_sync_x550em_a,
        .setup_fc               = ixgbe_setup_fc_x550em,
-       .fc_autoneg             = NULL, /* defined later */
+       .fc_autoneg             = ixgbe_fc_autoneg,
        .read_iosf_sb_reg       = ixgbe_read_iosf_sb_reg_x550a,
        .write_iosf_sb_reg      = ixgbe_write_iosf_sb_reg_x550a,
 };