linux-kernel - [PATCH] drivers/net/phy/micrel: Fix for PHY KSZ8061 errrata: Potential link-up failure when Ethernet cable is connected slowly

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Message-Id: <1527251853-22218-1-git-send-email-alexander.onnasch@landisgyr.com>
Date:   Fri, 25 May 2018 14:37:33 +0200
From:   Alexander Onnasch <alexander.onnasch@...disgyr.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     alexander.onnasch@...disgyr.com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/net/phy/micrel: Fix for PHY KSZ8061 errrata: Potential link-up failure when Ethernet cable is connected slowly

Signed-off-by: Alexander Onnasch <alexander.onnasch@...disgyr.com>
---
 drivers/net/phy/micrel.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 6c45ff6..7d80a00 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -339,6 +339,28 @@ static int ksz8041_config_aneg(struct phy_device *phydev)
        return genphy_config_aneg(phydev);
 }

+#define MII_KSZ8061RN_MMD_CTRL_REG         0x0d
+#define MII_KSZ8061RN_MMD_REGDATA_REG  0x0e
+
+static int ksz8061_extended_write(struct phy_device *phydev,
+                                 u8 mode, u32 dev_addr, u32 regnum, u16 val)
+{
+       phy_write(phydev, MII_KSZ8061RN_MMD_CTRL_REG, dev_addr);
+       phy_write(phydev, MII_KSZ8061RN_MMD_REGDATA_REG, regnum);
+       phy_write(phydev, MII_KSZ8061RN_MMD_CTRL_REG, (mode << 14) | dev_addr);
+       return phy_write(phydev, MII_KSZ8061RN_MMD_REGDATA_REG, val);
+}
+
+static int ksz8061_config_init(struct phy_device *phydev)
+{
+       int ret;
+
+       ret = ksz8061_extended_write(phydev, 0x1, 0x1, 0x2, 0xB61A);
+       if (ret)
+               return ret;
+       return kszphy_config_init(phydev);
+}
+
 static int ksz9021_load_values_from_of(struct phy_device *phydev,
                                       const struct device_node *of_node,
                                       u16 reg,
@@ -938,7 +960,7 @@ static struct phy_driver ksphy_driver[] = {
        .phy_id_mask    = MICREL_PHY_ID_MASK,
        .features       = PHY_BASIC_FEATURES,
        .flags          = PHY_HAS_INTERRUPT,
-       .config_init    = kszphy_config_init,
+       .config_init    = ksz8061_config_init,
        .config_aneg    = genphy_config_aneg,
        .read_status    = genphy_read_status,
        .ack_interrupt  = kszphy_ack_interrupt,
--
2.7.4


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