diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 86021e6b67b2..da4542be756a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -311,12 +311,10 @@ static int stmmac_mdio_read_c45(struct mii_bus *bus, int phyaddr, int devad,
 
 	value |= (phyaddr << priv->hw->mii.addr_shift)
 		& priv->hw->mii.addr_mask;
-	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
 	value |= MII_GMAC4_READ;
 	value |= MII_GMAC4_C45E;
-	value &= ~priv->hw->mii.reg_mask;
 	value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 
 	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;
@@ -409,14 +407,12 @@ static int stmmac_mdio_write_c45(struct mii_bus *bus, int phyaddr,
 
 	value |= (phyaddr << priv->hw->mii.addr_shift)
 		& priv->hw->mii.addr_mask;
-	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
 
 	value |= MII_GMAC4_WRITE;
 	value |= MII_GMAC4_C45E;
-	value &= ~priv->hw->mii.reg_mask;
 	value |= (devad << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 
 	data |= phyreg << MII_GMAC4_REG_ADDR_SHIFT;