net: mii: Rename mii_stat1000_to_linkmode_lpa_t

Rename mii_stat1000_to_linkmode_lpa_t to
mii_stat1000_mod_linkmode_lpa_t to indicate it modifies the passed
linkmode bitmap, without clearing any other bits.

Add a helper to set/clear bits in a linkmode.

Use this helper to ensure bit are clear which the stat1000 indicates
should not be set.

Fixes: c0ec3c27 ("net: phy: Convert u32 phydev->lp_advertising to linkmode")
Suggested-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/marvell.c

@@ -1138,7 +1138,7 @@ static int marvell_read_status_page_an(struct phy_device *phydev,
 
 	if (!fiber) {
 		mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising, lpa);
-		mii_stat1000_to_linkmode_lpa_t(phydev->lp_advertising, lpagb);
+		mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, lpagb);
 
 		if (phydev->duplex == DUPLEX_FULL) {
 			phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;

drivers/net/phy/marvell10g.c

@@ -490,7 +490,7 @@ static int mv3310_read_status(struct phy_device *phydev)
 		if (val < 0)
 			return val;
 
-		mii_stat1000_to_linkmode_lpa_t(phydev->lp_advertising, val);
+		mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, val);
 
 		if (phydev->autoneg == AUTONEG_ENABLE)
 			phy_resolve_aneg_linkmode(phydev);

drivers/net/phy/phy_device.c

@@ -1739,7 +1739,7 @@ int genphy_read_status(struct phy_device *phydev)
 				return -ENOLINK;
 			}
 
-			mii_stat1000_to_linkmode_lpa_t(phydev->lp_advertising,
+			mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
 							lpagb);
 			common_adv_gb = lpagb & adv << 2;
 		}

include/linux/linkmode.h

@@ -57,6 +57,15 @@ static inline void linkmode_clear_bit(int nr, volatile unsigned long *addr)
 	__clear_bit(nr, addr);
 }
 
+static inline void linkmode_mod_bit(int nr, volatile unsigned long *addr,
+				    int set)
+{
+	if (set)
+		linkmode_set_bit(nr, addr);
+	else
+		linkmode_clear_bit(nr, addr);
+}
+
 static inline void linkmode_change_bit(int nr, volatile unsigned long *addr)
 {
 	__change_bit(nr, addr);

include/linux/mii.h

@@ -288,22 +288,22 @@ static inline u32 mii_stat1000_to_ethtool_lpa_t(u32 lpa)
 }
 
 /**
- * mii_stat1000_to_linkmode_lpa_t
+ * mii_stat1000_mod_linkmode_lpa_t
  * @advertising: target the linkmode advertisement settings
  * @adv: value of the MII_STAT1000 register
  *
  * A small helper function that translates MII_STAT1000 bits, when in
- * 1000Base-T mode, to linkmode advertisement settings.
+ * 1000Base-T mode, to linkmode advertisement settings. Other bits in
+ * advertising are not changes.
  */
-static inline void mii_stat1000_to_linkmode_lpa_t(unsigned long *advertising,
+static inline void mii_stat1000_mod_linkmode_lpa_t(unsigned long *advertising,
 						   u32 lpa)
 {
-	if (lpa & LPA_1000HALF)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
-				 advertising);
-	if (lpa & LPA_1000FULL)
-		linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
-				 advertising);
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+			 advertising, lpa & LPA_1000HALF);
+
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+			 advertising, lpa & LPA_1000FULL);
 }
 
 /**