[PATCH net-next v4 3/5] net: phy: c45: add a separate function to read BASE-T1 abilities

[Stefan Eichenberger <eichest@gmail.com>]

Add a separate function to read the BASE-T1 abilities. Some PHYs do not
indicate the availability of the extended BASE-T1 ability register, so
this function must be called separately.

Signed-off-by: Stefan Eichenberger <eichest@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 drivers/net/phy/phy-c45.c | 44 +++++++++++++++++++++++++++------------
 include/linux/phy.h       |  1 +
 2 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index b73c428a15663..58a6bbbe8a70c 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c
@@ -881,6 +881,36 @@ int genphy_c45_an_config_eee_aneg(struct phy_device *phydev)
 	return genphy_c45_write_eee_adv(phydev, phydev->advertising_eee);
 }
 
+/**
+ * genphy_c45_pma_baset1_read_abilities - read supported baset1 link modes from PMA
+ * @phydev: target phy_device struct
+ *
+ * Read the supported link modes from the extended BASE-T1 ability register
+ */
+int genphy_c45_pma_baset1_read_abilities(struct phy_device *phydev)
+{
+	int val;
+
+	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1);
+	if (val < 0)
+		return val;
+
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
+			 phydev->supported,
+			 val & MDIO_PMA_PMD_BT1_B10L_ABLE);
+
+	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_T1_STAT);
+	if (val < 0)
+		return val;
+
+	linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+			 phydev->supported,
+			 val & MDIO_AN_STAT1_ABLE);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(genphy_c45_pma_baset1_read_abilities);
+
 /**
  * genphy_c45_pma_read_abilities - read supported link modes from PMA
  * @phydev: target phy_device struct
@@ -977,21 +1007,9 @@ int genphy_c45_pma_read_abilities(struct phy_device *phydev)
 		}
 
 		if (val & MDIO_PMA_EXTABLE_BT1) {
-			val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1);
+			val = genphy_c45_pma_baset1_read_abilities(phydev);
 			if (val < 0)
 				return val;
-
-			linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
-					 phydev->supported,
-					 val & MDIO_PMA_PMD_BT1_B10L_ABLE);
-
-			val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_T1_STAT);
-			if (val < 0)
-				return val;
-
-			linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
-					 phydev->supported,
-					 val & MDIO_AN_STAT1_ABLE);
 		}
 	}
 
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 11c1e91563d47..b254848a9c99a 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1826,6 +1826,7 @@ int genphy_c45_an_config_aneg(struct phy_device *phydev);
 int genphy_c45_an_disable_aneg(struct phy_device *phydev);
 int genphy_c45_read_mdix(struct phy_device *phydev);
 int genphy_c45_pma_read_abilities(struct phy_device *phydev);
+int genphy_c45_pma_baset1_read_abilities(struct phy_device *phydev);
 int genphy_c45_read_eee_abilities(struct phy_device *phydev);
 int genphy_c45_pma_baset1_read_master_slave(struct phy_device *phydev);
 int genphy_c45_read_status(struct phy_device *phydev);
-- 
2.39.2