net: phy: micrel: make sure the factory test bit is cleared

The KSZ8081 PHY has a factory test mode which is set at the de-assertion
of the reset line based on the RXER (KSZ8081RNA/RND) or TXC
(KSZ8081MNX/RNB) pin. If a pull-down is missing, or if the pin has a
pull-up, the factory test mode should be cleared by manually writing a 0
(according to the datasheet). This patch makes sure this factory test
bit is cleared in config_init().

Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index ddd6b6374d8c..3c8186f269f9 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -28,6 +28,7 @@
 
 /* Operation Mode Strap Override */
 #define MII_KSZPHY_OMSO                         0x16
+#define KSZPHY_OMSO_FACTORY_TEST                BIT(15)
 #define KSZPHY_OMSO_B_CAST_OFF                  BIT(9)
 #define KSZPHY_OMSO_NAND_TREE_ON                BIT(5)
 #define KSZPHY_OMSO_RMII_OVERRIDE               BIT(1)
@@ -340,6 +341,18 @@ static int ksz8041_config_aneg(struct phy_device *phydev)
         return genphy_config_aneg(phydev);
 }
 
+static int ksz8081_config_init(struct phy_device *phydev)
+{
+        /* KSZPHY_OMSO_FACTORY_TEST is set at de-assertion of the reset line
+         * based on the RXER (KSZ8081RNA/RND) or TXC (KSZ8081MNX/RNB) pin. If a
+         * pull-down is missing, the factory test mode should be cleared by
+         * manually writing a 0.
+         */
+        phy_clear_bits(phydev, MII_KSZPHY_OMSO, KSZPHY_OMSO_FACTORY_TEST);
+
+        return kszphy_config_init(phydev);
+}
+
 static int ksz8061_config_init(struct phy_device *phydev)
 {
         int ret;
@@ -1038,7 +1051,7 @@ static struct phy_driver ksphy_driver[] = {
         /* PHY_BASIC_FEATURES */
         .driver_data    = &ksz8081_type,
         .probe          = kszphy_probe,
-        .config_init    = kszphy_config_init,
+        .config_init    = ksz8081_config_init,
         .ack_interrupt  = kszphy_ack_interrupt,
         .config_intr    = kszphy_config_intr,
         .get_sset_count = kszphy_get_sset_count,