ixgbe/base: disable X550em FEC to save power

The FEC (Forward Error Correction) feature can improve BER (Bit Error Rate)
but uses more power to do so. It also cannot be used with
EEE (Energy Efficient Ethernet).
EEE is an important feature, and we have no known BER issues, so FEC
is not needed.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>

diff --git a/drivers/net/ixgbe/base/ixgbe_x550.c b/drivers/net/ixgbe/base/ixgbe_x550.c
index 319aa0d..e6d0a9f 100644 (file)
--- a/drivers/net/ixgbe/base/ixgbe_x550.c
+++ b/drivers/net/ixgbe/base/ixgbe_x550.c
@@ -1383,8 +1383,8 @@ s32 ixgbe_setup_kr_x550em(struct ixgbe_hw *hw)
                return status;
 
        reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_ENABLE;
-       reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_FEC_REQ;
-       reg_val |= IXGBE_KRM_LINK_CTRL_1_TETH_AN_CAP_FEC;
+       reg_val &= ~(IXGBE_KRM_LINK_CTRL_1_TETH_AN_FEC_REQ |
+                    IXGBE_KRM_LINK_CTRL_1_TETH_AN_CAP_FEC);
        reg_val &= ~(IXGBE_KRM_LINK_CTRL_1_TETH_AN_CAP_KR |
                     IXGBE_KRM_LINK_CTRL_1_TETH_AN_CAP_KX);