The application of a mask to clear an area of a clause 37 register value
was not properly applied. Update the code to do the proper application
of the mask.

Reported-by: Marion & Christophe JAILLET <christophe.jail...@wanadoo.fr>
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-mdio.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c 
b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
index 0ecae70..4c5b90e 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
@@ -943,8 +943,8 @@ static void xgbe_an37_init(struct xgbe_prv_data *pdata)
 
        /* Set up the Control register */
        reg = XMDIO_READ(pdata, MDIO_MMD_VEND2, MDIO_VEND2_AN_CTRL);
-       reg &= XGBE_AN_CL37_TX_CONFIG_MASK;
-       reg &= XGBE_AN_CL37_PCS_MODE_MASK;
+       reg &= ~XGBE_AN_CL37_TX_CONFIG_MASK;
+       reg &= ~XGBE_AN_CL37_PCS_MODE_MASK;
 
        switch (pdata->an_mode) {
        case XGBE_AN_MODE_CL37:

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