[net-next 12/15] ixgbe: add write flush when configuring CS4223/7

[Jeff Kirsher]

From: Emil Tantilov <emil.s.tanti...@intel.com>

Make sure the writes are processed immediately. Without the flush it
is possible for operations on one port to spill over the other as the
resource is shared.

Signed-off-by: Emil Tantilov <emil.s.tanti...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index 32b35efde2df..80824fec15d2 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -1824,12 +1824,28 @@ ixgbe_setup_mac_link_sfp_x550a(struct ixgbe_hw *hw, 
ixgbe_link_speed speed,
 
        /* Configure CS4227/CS4223 LINE side to proper mode. */
        reg_slice = IXGBE_CS4227_LINE_SPARE24_LSB + slice_offset;
+
+       ret_val = hw->phy.ops.read_reg(hw, reg_slice,
+                                      IXGBE_MDIO_ZERO_DEV_TYPE, &reg_phy_ext);
+       if (ret_val)
+               return ret_val;
+
+       reg_phy_ext &= ~((IXGBE_CS4227_EDC_MODE_CX1 << 1) |
+                        (IXGBE_CS4227_EDC_MODE_SR << 1));
+
        if (setup_linear)
                reg_phy_ext = (IXGBE_CS4227_EDC_MODE_CX1 << 1) | 1;
        else
                reg_phy_ext = (IXGBE_CS4227_EDC_MODE_SR << 1) | 1;
-       return hw->phy.ops.write_reg(hw, reg_slice, IXGBE_MDIO_ZERO_DEV_TYPE,
-                                    reg_phy_ext);
+
+       ret_val = hw->phy.ops.write_reg(hw, reg_slice,
+                                       IXGBE_MDIO_ZERO_DEV_TYPE, reg_phy_ext);
+       if (ret_val)
+               return ret_val;
+
+       /* Flush previous write with a read */
+       return hw->phy.ops.read_reg(hw, reg_slice,
+                                   IXGBE_MDIO_ZERO_DEV_TYPE, &reg_phy_ext);
 }
 
 /**
-- 
2.12.2