21.02/files/target/linux/mediatek/patches-5.4/999-1709-v6.2-net-phy-sfp-add-rollball-support.patch

From 1631a36b9ac022ce6ffb58b039a7e85ad3414ed5 Mon Sep 17 00:00:00 2001
From: Sam Shih <sam.shih@mediatek.com>
Date: Fri, 2 Jun 2023 13:06:01 +0800
Subject: [PATCH] 
 [backport-networking-drivers][999-1709-net-phy-sfp-add-rollball-support.patch]

---
 drivers/net/phy/marvell.c     |   2 +-
 drivers/net/phy/marvell10g.c  | 168 +++++++++++++--
 drivers/net/phy/mdio-i2c.c    | 309 +++++++++++++++++++++++++++-
 drivers/net/phy/phylink.c     |  74 +++++--
 drivers/net/phy/sfp-bus.c     | 102 +---------
 drivers/net/phy/sfp.c         | 373 +++++++++++++++++++++++++++++-----
 drivers/net/phy/sfp.h         |  11 +-
 include/linux/mdio/mdio-i2c.h |  10 +-
 8 files changed, 874 insertions(+), 175 deletions(-)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index 49801c2eb..f25881745 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -2175,7 +2175,7 @@ static struct phy_driver marvell_drivers[] = {
 		.phy_id = MARVELL_PHY_ID_88E1111,
 		.phy_id_mask = MARVELL_PHY_ID_MASK,
 		.name = "Marvell 88E1111",
-		/* PHY_GBIT_FEATURES */
+		.features = PHY_GBIT_FEATURES,
 		.probe = marvell_probe,
 		.config_init = &m88e1111_config_init,
 		.config_aneg = &marvell_config_aneg,
diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
index 1e4631761..7d080d52e 100644
--- a/drivers/net/phy/marvell10g.c
+++ b/drivers/net/phy/marvell10g.c
@@ -32,6 +32,15 @@
 #define MV_PHY_ALASKA_NBT_QUIRK_REV	(MARVELL_PHY_ID_88X3310 | 0xa)
 
 enum {
+	MV_PMA_21X0_PORT_CTRL	= 0xc04a,
+	MV_PMA_21X0_PORT_CTRL_SWRST				= BIT(15),
+	MV_PMA_21X0_PORT_CTRL_MACTYPE_MASK			= 0x7,
+	MV_PMA_21X0_PORT_CTRL_MACTYPE_USXGMII			= 0x0,
+	MV_PMA_2180_PORT_CTRL_MACTYPE_DXGMII			= 0x1,
+	MV_PMA_2180_PORT_CTRL_MACTYPE_QXGMII			= 0x2,
+	MV_PMA_21X0_PORT_CTRL_MACTYPE_5GBASER			= 0x4,
+	MV_PMA_21X0_PORT_CTRL_MACTYPE_5GBASER_NO_SGMII_AN	= 0x5,
+	MV_PMA_21X0_PORT_CTRL_MACTYPE_10GBASER_RATE_MATCH	= 0x6,
 	MV_PMA_BOOT		= 0xc050,
 	MV_PMA_BOOT_FATAL	= BIT(0),
 
@@ -53,7 +62,18 @@ enum {
 
 	/* Vendor2 MMD registers */
 	MV_V2_PORT_CTRL		= 0xf001,
-	MV_V2_PORT_CTRL_PWRDOWN = 0x0800,
+	MV_V2_PORT_CTRL_PWRDOWN					= BIT(11),
+	MV_V2_33X0_PORT_CTRL_SWRST				= BIT(15),
+	MV_V2_33X0_PORT_CTRL_MACTYPE_MASK			= 0x7,
+	MV_V2_33X0_PORT_CTRL_MACTYPE_RXAUI			= 0x0,
+	MV_V2_3310_PORT_CTRL_MACTYPE_XAUI_RATE_MATCH		= 0x1,
+	MV_V2_3340_PORT_CTRL_MACTYPE_RXAUI_NO_SGMII_AN		= 0x1,
+	MV_V2_33X0_PORT_CTRL_MACTYPE_RXAUI_RATE_MATCH		= 0x2,
+	MV_V2_3310_PORT_CTRL_MACTYPE_XAUI			= 0x3,
+	MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER			= 0x4,
+	MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER_NO_SGMII_AN	= 0x5,
+	MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER_RATE_MATCH	= 0x6,
+	MV_V2_33X0_PORT_CTRL_MACTYPE_USXGMII			= 0x7,
 	MV_V2_TEMP_CTRL		= 0xf08a,
 	MV_V2_TEMP_CTRL_MASK	= 0xc000,
 	MV_V2_TEMP_CTRL_SAMPLE	= 0x0000,
@@ -62,11 +82,24 @@ enum {
 	MV_V2_TEMP_UNKNOWN	= 0x9600, /* unknown function */
 };
 
+struct mv3310_chip {
+	int (*get_mactype)(struct phy_device *phydev);
+	int (*init_interface)(struct phy_device *phydev, int mactype);
+};
+
 struct mv3310_priv {
+	bool rate_match;
+	phy_interface_t const_interface;
+
 	struct device *hwmon_dev;
 	char *hwmon_name;
 };
 
+static const struct mv3310_chip *to_mv3310_chip(struct phy_device *phydev)
+{
+	return phydev->drv->driver_data;
+}
+
 #ifdef CONFIG_HWMON
 static umode_t mv3310_hwmon_is_visible(const void *data,
 				       enum hwmon_sensor_types type,
@@ -155,13 +188,6 @@ static int mv3310_hwmon_config(struct phy_device *phydev, bool enable)
 			      MV_V2_TEMP_CTRL_MASK, val);
 }
 
-static void mv3310_hwmon_disable(void *data)
-{
-	struct phy_device *phydev = data;
-
-	mv3310_hwmon_config(phydev, false);
-}
-
 static int mv3310_hwmon_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
@@ -185,10 +211,6 @@ static int mv3310_hwmon_probe(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-	ret = devm_add_action_or_reset(dev, mv3310_hwmon_disable, phydev);
-	if (ret)
-		return ret;
-
 	priv->hwmon_dev = devm_hwmon_device_register_with_info(dev,
 				priv->hwmon_name, phydev,
 				&mv3310_hwmon_chip_info, NULL);
@@ -262,6 +284,11 @@ static int mv3310_probe(struct phy_device *phydev)
 	return phy_sfp_probe(phydev, &mv3310_sfp_ops);
 }
 
+static void mv3310_remove(struct phy_device *phydev)
+{
+	mv3310_hwmon_config(phydev, false);
+}
+
 static int mv3310_suspend(struct phy_device *phydev)
 {
 	return phy_set_bits_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL,
@@ -297,8 +324,84 @@ static bool mv3310_has_pma_ngbaset_quirk(struct phy_device *phydev)
 		MV_PHY_ALASKA_NBT_QUIRK_MASK) == MV_PHY_ALASKA_NBT_QUIRK_REV;
 }
 
+static int mv2110_get_mactype(struct phy_device *phydev)
+{
+	int mactype;
+
+	mactype = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MV_PMA_21X0_PORT_CTRL);
+	if (mactype < 0)
+		return mactype;
+
+	return mactype & MV_PMA_21X0_PORT_CTRL_MACTYPE_MASK;
+}
+
+static int mv3310_get_mactype(struct phy_device *phydev)
+{
+	int mactype;
+
+	mactype = phy_read_mmd(phydev, MDIO_MMD_VEND2, MV_V2_PORT_CTRL);
+	if (mactype < 0)
+		return mactype;
+
+	return mactype & MV_V2_33X0_PORT_CTRL_MACTYPE_MASK;
+}
+
+static int mv2110_init_interface(struct phy_device *phydev, int mactype)
+{
+	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
+
+	priv->rate_match = false;
+
+	if (mactype == MV_PMA_21X0_PORT_CTRL_MACTYPE_10GBASER_RATE_MATCH)
+		priv->rate_match = true;
+
+	if (mactype == MV_PMA_21X0_PORT_CTRL_MACTYPE_USXGMII)
+		priv->const_interface = PHY_INTERFACE_MODE_USXGMII;
+	else if (mactype == MV_PMA_21X0_PORT_CTRL_MACTYPE_10GBASER_RATE_MATCH)
+		priv->const_interface = PHY_INTERFACE_MODE_10GKR;
+	else if (mactype == MV_PMA_21X0_PORT_CTRL_MACTYPE_5GBASER ||
+		 mactype == MV_PMA_21X0_PORT_CTRL_MACTYPE_5GBASER_NO_SGMII_AN)
+		priv->const_interface = PHY_INTERFACE_MODE_NA;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static int mv3310_init_interface(struct phy_device *phydev, int mactype)
+{
+	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
+
+	priv->rate_match = false;
+
+	if (mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER_RATE_MATCH ||
+	    mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_RXAUI_RATE_MATCH ||
+	    mactype == MV_V2_3310_PORT_CTRL_MACTYPE_XAUI_RATE_MATCH)
+		priv->rate_match = true;
+
+	if (mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_USXGMII)
+		priv->const_interface = PHY_INTERFACE_MODE_USXGMII;
+	else if (mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER_RATE_MATCH ||
+		 mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER_NO_SGMII_AN ||
+		 mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_10GBASER)
+		priv->const_interface = PHY_INTERFACE_MODE_10GKR;
+	else if (mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_RXAUI_RATE_MATCH ||
+		 mactype == MV_V2_33X0_PORT_CTRL_MACTYPE_RXAUI)
+		priv->const_interface = PHY_INTERFACE_MODE_RXAUI;
+	else if (mactype == MV_V2_3310_PORT_CTRL_MACTYPE_XAUI_RATE_MATCH ||
+		 mactype == MV_V2_3310_PORT_CTRL_MACTYPE_XAUI)
+		priv->const_interface = PHY_INTERFACE_MODE_XAUI;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
 static int mv3310_config_init(struct phy_device *phydev)
 {
+	const struct mv3310_chip *chip = to_mv3310_chip(phydev);
+	int err, mactype;
+
 	/* Check that the PHY interface type is compatible */
 	if (phydev->interface != PHY_INTERFACE_MODE_SGMII &&
 	    phydev->interface != PHY_INTERFACE_MODE_2500BASEX &&
@@ -307,6 +410,16 @@ static int mv3310_config_init(struct phy_device *phydev)
 	    phydev->interface != PHY_INTERFACE_MODE_10GKR)
 		return -ENODEV;
 
+	mactype = chip->get_mactype(phydev);
+	if (mactype < 0)
+		return mactype;
+
+	err = chip->init_interface(phydev, mactype);
+	if (err) {
+		phydev_err(phydev, "MACTYPE configuration invalid\n");
+		return err;
+	}
+
 	return 0;
 }
 
@@ -384,6 +497,23 @@ static int mv3310_aneg_done(struct phy_device *phydev)
 
 static void mv3310_update_interface(struct phy_device *phydev)
 {
+	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
+
+	if (!phydev->link)
+		return;
+
+	/* In all of the "* with Rate Matching" modes the PHY interface is fixed
+	 * at 10Gb. The PHY adapts the rate to actual wire speed with help of
+	 * internal 16KB buffer.
+	 *
+	 * In USXGMII mode the PHY interface mode is also fixed.
+	 */
+	if (priv->rate_match ||
+	    priv->const_interface == PHY_INTERFACE_MODE_USXGMII) {
+		phydev->interface = priv->const_interface;
+		return;
+	}
+
 	if ((phydev->interface == PHY_INTERFACE_MODE_SGMII ||
 	     phydev->interface == PHY_INTERFACE_MODE_2500BASEX ||
 	     phydev->interface == PHY_INTERFACE_MODE_5GBASER ||
@@ -503,11 +633,22 @@ static int mv3310_read_status(struct phy_device *phydev)
 	return 0;
 }
 
+static const struct mv3310_chip mv3310_type = {
+	.get_mactype = mv3310_get_mactype,
+	.init_interface = mv3310_init_interface,
+};
+
+static const struct mv3310_chip mv2111_type = {
+	.get_mactype = mv2110_get_mactype,
+	.init_interface = mv2110_init_interface,
+};
+
 static struct phy_driver mv3310_drivers[] = {
 	{
 		.phy_id		= MARVELL_PHY_ID_88X3310,
 		.phy_id_mask	= MARVELL_PHY_ID_MASK,
 		.name		= "mv88x3310",
+		.driver_data	= &mv3310_type,
 		.get_features	= mv3310_get_features,
 		.soft_reset	= genphy_no_soft_reset,
 		.config_init	= mv3310_config_init,
@@ -517,11 +658,13 @@ static struct phy_driver mv3310_drivers[] = {
 		.config_aneg	= mv3310_config_aneg,
 		.aneg_done	= mv3310_aneg_done,
 		.read_status	= mv3310_read_status,
+		.remove		= mv3310_remove,
 	},
 	{
 		.phy_id		= MARVELL_PHY_ID_88E2110,
 		.phy_id_mask	= MARVELL_PHY_ID_MASK,
 		.name		= "mv88x2110",
+		.driver_data	= &mv2111_type,
 		.probe		= mv3310_probe,
 		.suspend	= mv3310_suspend,
 		.resume		= mv3310_resume,
@@ -530,6 +673,7 @@ static struct phy_driver mv3310_drivers[] = {
 		.config_aneg	= mv3310_config_aneg,
 		.aneg_done	= mv3310_aneg_done,
 		.read_status	= mv3310_read_status,
+		.remove		= mv3310_remove,
 	},
 };
 
diff --git a/drivers/net/phy/mdio-i2c.c b/drivers/net/phy/mdio-i2c.c
index 09200a70b..85db63c33 100644
--- a/drivers/net/phy/mdio-i2c.c
+++ b/drivers/net/phy/mdio-i2c.c
@@ -12,6 +12,7 @@
 #include <linux/i2c.h>
 #include <linux/mdio/mdio-i2c.h>
 #include <linux/phy.h>
+#include <linux/sfp.h>
 
 /*
  * I2C bus addresses 0x50 and 0x51 are normally an EEPROM, which is
@@ -28,7 +29,7 @@ static unsigned int i2c_mii_phy_addr(int phy_id)
 	return phy_id + 0x40;
 }
 
-static int i2c_mii_read(struct mii_bus *bus, int phy_id, int reg)
+static int i2c_mii_read_default(struct mii_bus *bus, int phy_id, int reg)
 {
 	struct i2c_adapter *i2c = bus->priv;
 	struct i2c_msg msgs[2];
@@ -62,7 +63,8 @@ static int i2c_mii_read(struct mii_bus *bus, int phy_id, int reg)
 	return data[0] << 8 | data[1];
 }
 
-static int i2c_mii_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
+static int i2c_mii_write_default(struct mii_bus *bus, int phy_id, int reg,
+				 u16 val)
 {
 	struct i2c_adapter *i2c = bus->priv;
 	struct i2c_msg msg;
@@ -91,9 +93,288 @@ static int i2c_mii_write(struct mii_bus *bus, int phy_id, int reg, u16 val)
 	return ret < 0 ? ret : 0;
 }
 
-struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c)
+/* RollBall SFPs do not access internal PHY via I2C address 0x56, but
+ * instead via address 0x51, when SFP page is set to 0x03 and password to
+ * 0xffffffff.
+ *
+ * address  size  contents  description
+ * -------  ----  --------  -----------
+ * 0x80     1     CMD       0x01/0x02/0x04 for write/read/done
+ * 0x81     1     DEV       Clause 45 device
+ * 0x82     2     REG       Clause 45 register
+ * 0x84     2     VAL       Register value
+ */
+#define ROLLBALL_PHY_I2C_ADDR		0x51
+
+#define ROLLBALL_PASSWORD		(SFP_VSL + 3)
+
+#define ROLLBALL_CMD_ADDR		0x80
+#define ROLLBALL_DATA_ADDR		0x81
+
+#define ROLLBALL_CMD_WRITE		0x01
+#define ROLLBALL_CMD_READ		0x02
+#define ROLLBALL_CMD_DONE		0x04
+
+#define SFP_PAGE_ROLLBALL_MDIO		3
+
+static int __i2c_transfer_err(struct i2c_adapter *i2c, struct i2c_msg *msgs,
+			      int num)
+{
+	int ret;
+
+	ret = __i2c_transfer(i2c, msgs, num);
+	if (ret < 0)
+		return ret;
+	else if (ret != num)
+		return -EIO;
+	else
+		return 0;
+}
+
+static int __i2c_rollball_get_page(struct i2c_adapter *i2c, int bus_addr,
+				   u8 *page)
+{
+	struct i2c_msg msgs[2];
+	u8 addr = SFP_PAGE;
+
+	msgs[0].addr = bus_addr;
+	msgs[0].flags = 0;
+	msgs[0].len = 1;
+	msgs[0].buf = &addr;
+
+	msgs[1].addr = bus_addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = 1;
+	msgs[1].buf = page;
+
+	return __i2c_transfer_err(i2c, msgs, 2);
+}
+
+static int __i2c_rollball_set_page(struct i2c_adapter *i2c, int bus_addr,
+				   u8 page)
+{
+	struct i2c_msg msg;
+	u8 buf[2];
+
+	buf[0] = SFP_PAGE;
+	buf[1] = page;
+
+	msg.addr = bus_addr;
+	msg.flags = 0;
+	msg.len = 2;
+	msg.buf = buf;
+
+	return __i2c_transfer_err(i2c, &msg, 1);
+}
+
+/* In order to not interfere with other SFP code (which possibly may manipulate
+ * SFP_PAGE), for every transfer we do this:
+ *   1. lock the bus
+ *   2. save content of SFP_PAGE
+ *   3. set SFP_PAGE to 3
+ *   4. do the transfer
+ *   5. restore original SFP_PAGE
+ *   6. unlock the bus
+ * Note that one might think that steps 2 to 5 could be theoretically done all
+ * in one call to i2c_transfer (by constructing msgs array in such a way), but
+ * unfortunately tests show that this does not work :-( Changed SFP_PAGE does
+ * not take into account until i2c_transfer() is done.
+ */
+static int i2c_transfer_rollball(struct i2c_adapter *i2c,
+				 struct i2c_msg *msgs, int num)
+{
+	int ret, main_err = 0;
+	u8 saved_page;
+
+	i2c_lock_bus(i2c, I2C_LOCK_SEGMENT);
+
+	/* save original page */
+	ret = __i2c_rollball_get_page(i2c, msgs->addr, &saved_page);
+	if (ret)
+		goto unlock;
+
+	/* change to RollBall MDIO page */
+	ret = __i2c_rollball_set_page(i2c, msgs->addr, SFP_PAGE_ROLLBALL_MDIO);
+	if (ret)
+		goto unlock;
+
+	/* do the transfer; we try to restore original page if this fails */
+	ret = __i2c_transfer_err(i2c, msgs, num);
+	if (ret)
+		main_err = ret;
+
+	/* restore original page */
+	ret = __i2c_rollball_set_page(i2c, msgs->addr, saved_page);
+
+unlock:
+	i2c_unlock_bus(i2c, I2C_LOCK_SEGMENT);
+
+	return main_err ? : ret;
+}
+
+static int i2c_rollball_mii_poll(struct mii_bus *bus, int bus_addr, u8 *buf,
+				 size_t len)
+{
+	struct i2c_adapter *i2c = bus->priv;
+	struct i2c_msg msgs[2];
+	u8 cmd_addr, tmp, *res;
+	int i, ret;
+
+	cmd_addr = ROLLBALL_CMD_ADDR;
+
+	res = buf ? buf : &tmp;
+	len = buf ? len : 1;
+
+	msgs[0].addr = bus_addr;
+	msgs[0].flags = 0;
+	msgs[0].len = 1;
+	msgs[0].buf = &cmd_addr;
+
+	msgs[1].addr = bus_addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = len;
+	msgs[1].buf = res;
+
+	/* By experiment it takes up to 70 ms to access a register for these
+	 * SFPs. Sleep 20ms between iterations and try 10 times.
+	 */
+	i = 10;
+	do {
+		msleep(20);
+
+		ret = i2c_transfer_rollball(i2c, msgs, ARRAY_SIZE(msgs));
+		if (ret)
+			return ret;
+
+		if (*res == ROLLBALL_CMD_DONE)
+			return 0;
+	} while (i-- > 0);
+
+	dev_info(&bus->dev, "poll timed out\n");
+
+	return -ETIMEDOUT;
+}
+
+static int i2c_rollball_mii_cmd(struct mii_bus *bus, int bus_addr, u8 cmd,
+				u8 *data, size_t len)
+{
+	struct i2c_adapter *i2c = bus->priv;
+	struct i2c_msg msgs[2];
+	u8 cmdbuf[2];
+
+	cmdbuf[0] = ROLLBALL_CMD_ADDR;
+	cmdbuf[1] = cmd;
+
+	msgs[0].addr = bus_addr;
+	msgs[0].flags = 0;
+	msgs[0].len = len;
+	msgs[0].buf = data;
+
+	msgs[1].addr = bus_addr;
+	msgs[1].flags = 0;
+	msgs[1].len = sizeof(cmdbuf);
+	msgs[1].buf = cmdbuf;
+
+	return i2c_transfer_rollball(i2c, msgs, ARRAY_SIZE(msgs));
+}
+
+static int i2c_mii_read_rollball(struct mii_bus *bus, int phy_id, int reg)
+{
+	u8 buf[4], res[6];
+	int bus_addr, ret;
+	u16 val;
+
+	if (!(reg & MII_ADDR_C45))
+		return -EOPNOTSUPP;
+
+	bus_addr = i2c_mii_phy_addr(phy_id);
+	if (bus_addr != ROLLBALL_PHY_I2C_ADDR)
+		return 0xffff;
+
+	buf[0] = ROLLBALL_DATA_ADDR;
+	buf[1] = (reg >> 16) & 0x1f;
+	buf[2] = (reg >> 8) & 0xff;
+	buf[3] = reg & 0xff;
+
+	ret = i2c_rollball_mii_cmd(bus, bus_addr, ROLLBALL_CMD_READ, buf,
+				   sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_rollball_mii_poll(bus, bus_addr, res, sizeof(res));
+	if (ret == -ETIMEDOUT)
+		return 0xffff;
+	else if (ret < 0)
+		return ret;
+
+	val = res[4] << 8 | res[5];
+
+	return val;
+}
+
+static int i2c_mii_write_rollball(struct mii_bus *bus, int phy_id, int reg,
+				  u16 val)
+{
+	int bus_addr, ret;
+	u8 buf[6];
+
+	if (!(reg & MII_ADDR_C45))
+		return -EOPNOTSUPP;
+
+	bus_addr = i2c_mii_phy_addr(phy_id);
+	if (bus_addr != ROLLBALL_PHY_I2C_ADDR)
+		return 0;
+
+	buf[0] = ROLLBALL_DATA_ADDR;
+	buf[1] = (reg >> 16) & 0x1f;
+	buf[2] = (reg >> 8) & 0xff;
+	buf[3] = reg & 0xff;
+	buf[4] = val >> 8;
+	buf[5] = val & 0xff;
+
+	ret = i2c_rollball_mii_cmd(bus, bus_addr, ROLLBALL_CMD_WRITE, buf,
+				   sizeof(buf));
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_rollball_mii_poll(bus, bus_addr, NULL, 0);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int i2c_mii_init_rollball(struct i2c_adapter *i2c)
+{
+	struct i2c_msg msg;
+	u8 pw[5];
+	int ret;
+
+	pw[0] = ROLLBALL_PASSWORD;
+	pw[1] = 0xff;
+	pw[2] = 0xff;
+	pw[3] = 0xff;
+	pw[4] = 0xff;
+
+	msg.addr = ROLLBALL_PHY_I2C_ADDR;
+	msg.flags = 0;
+	msg.len = sizeof(pw);
+	msg.buf = pw;
+
+	ret = i2c_transfer(i2c, &msg, 1);
+	if (ret < 0)
+		return ret;
+	else if (ret != 1)
+		return -EIO;
+	else
+		return 0;
+}
+
+struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c,
+			       enum mdio_i2c_proto protocol)
 {
 	struct mii_bus *mii;
+	int ret;
 
 	if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 		return ERR_PTR(-EINVAL);
@@ -104,10 +385,28 @@ struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c)
 
 	snprintf(mii->id, MII_BUS_ID_SIZE, "i2c:%s", dev_name(parent));
 	mii->parent = parent;
-	mii->read = i2c_mii_read;
-	mii->write = i2c_mii_write;
 	mii->priv = i2c;
 
+	switch (protocol) {
+	case MDIO_I2C_ROLLBALL:
+		ret = i2c_mii_init_rollball(i2c);
+		if (ret < 0) {
+			dev_err(parent,
+				"Cannot initialize RollBall MDIO I2C protocol: %d\n",
+				ret);
+			mdiobus_free(mii);
+			return ERR_PTR(ret);
+		}
+
+		mii->read = i2c_mii_read_rollball;
+		mii->write = i2c_mii_write_rollball;
+		break;
+	default:
+		mii->read = i2c_mii_read_default;
+		mii->write = i2c_mii_write_default;
+		break;
+	}
+
 	return mii;
 }
 EXPORT_SYMBOL_GPL(mdio_i2c_alloc);
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index f360d9225..67f34ed4c 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -483,62 +483,105 @@ static void phylink_resolve(struct work_struct *w)
 	struct phylink *pl = container_of(w, struct phylink, resolve);
 	struct phylink_link_state link_state;
 	struct net_device *ndev = pl->netdev;
-	int link_changed;
+	bool mac_config = false;
+	bool retrigger = false;
+	bool cur_link_state;
 
 	mutex_lock(&pl->state_mutex);
+	if (pl->netdev)
+		cur_link_state = netif_carrier_ok(ndev);
+	else
+		cur_link_state = pl->old_link_state;
+
 	if (pl->phylink_disable_state) {
 		pl->mac_link_dropped = false;
 		link_state.link = false;
 	} else if (pl->mac_link_dropped) {
 		link_state.link = false;
+		retrigger = true;
 	} else {
 		switch (pl->cur_link_an_mode) {
 		case MLO_AN_PHY:
 			link_state = pl->phy_state;
 			phylink_resolve_flow(pl, &link_state);
-			phylink_mac_config_up(pl, &link_state);
+			mac_config = link_state.link;
 			break;
 
 		case MLO_AN_FIXED:
 			phylink_get_fixed_state(pl, &link_state);
-			phylink_mac_config_up(pl, &link_state);
+			mac_config = link_state.link;
 			break;
 
 		case MLO_AN_INBAND:
 			phylink_get_mac_state(pl, &link_state);
 
+			/* The PCS may have a latching link-fail indicator.
+			 * If the link was up, bring the link down and
+			 * re-trigger the resolve. Otherwise, re-read the
+			 * PCS state to get the current status of the link.
+			 */
+			if (!link_state.link) {
+				if (cur_link_state)
+					retrigger = true;
+				else
+					phylink_get_mac_state(pl,
+							      &link_state);
+			}
+
 			/* If we have a phy, the "up" state is the union of
-			 * both the PHY and the MAC */
+			 * both the PHY and the MAC
+			 */
 			if (pl->phydev)
 				link_state.link &= pl->phy_state.link;
 
 			/* Only update if the PHY link is up */
 			if (pl->phydev && pl->phy_state.link) {
+				/* If the interface has changed, force a
+				 * link down event if the link isn't already
+				 * down, and re-resolve.
+				 */
+				if (link_state.interface !=
+				    pl->phy_state.interface) {
+					retrigger = true;
+					link_state.link = false;
+				}
 				link_state.interface = pl->phy_state.interface;
 
 				/* If we have a PHY, we need to update with
-				 * the pause mode bits. */
-				link_state.pause |= pl->phy_state.pause;
-				phylink_resolve_flow(pl, &link_state);
-				phylink_mac_config(pl, &link_state);
+				 * the PHY flow control bits.
+				 */
+				link_state.pause = pl->phy_state.pause;
+				mac_config = true;
 			}
+			phylink_resolve_flow(pl, &link_state);
 			break;
 		}
 	}
 
-	if (pl->netdev)
-		link_changed = (link_state.link != netif_carrier_ok(ndev));
-	else
-		link_changed = (link_state.link != pl->old_link_state);
+	if (mac_config) {
+		if (link_state.interface != pl->link_config.interface) {
+			/* The interface has changed, force the link down and
+			 * then reconfigure.
+			 */
+			if (cur_link_state) {
+				phylink_mac_link_down(pl);
+				cur_link_state = false;
+			}
+			phylink_mac_config(pl, &link_state);
+			pl->link_config.interface = link_state.interface;
+		} else {
+			phylink_mac_config(pl, &link_state);
+		}
+	}
 
-	if (link_changed) {
+	if (link_state.link != cur_link_state) {
 		pl->old_link_state = link_state.link;
 		if (!link_state.link)
 			phylink_mac_link_down(pl);
 		else
 			phylink_mac_link_up(pl, link_state);
 	}
-	if (!link_state.link && pl->mac_link_dropped) {
+	if (!link_state.link && retrigger) {
 		pl->mac_link_dropped = false;
 		queue_work(system_power_efficient_wq, &pl->resolve);
 	}
@@ -1014,7 +1057,8 @@ void phylink_start(struct phylink *pl)
 		if (irq <= 0)
 			mod_timer(&pl->link_poll, jiffies + HZ);
 	}
-	if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->get_fixed_state)
+	if ((pl->cfg_link_an_mode == MLO_AN_FIXED && pl->get_fixed_state) ||
+	    (pl->cfg_link_an_mode == MLO_AN_INBAND))
 		mod_timer(&pl->link_poll, jiffies + HZ);
 	if (pl->phydev)
 		phy_start(pl->phydev);
diff --git a/drivers/net/phy/sfp-bus.c b/drivers/net/phy/sfp-bus.c
index a2f451c31..4be24406b 100644
--- a/drivers/net/phy/sfp-bus.c
+++ b/drivers/net/phy/sfp-bus.c
@@ -10,12 +10,6 @@
 
 #include "sfp.h"
 
-struct sfp_quirk {
-	const char *vendor;
-	const char *part;
-	void (*modes)(const struct sfp_eeprom_id *id, unsigned long *modes);
-};
-
 /**
  * struct sfp_bus - internal representation of a sfp bus
  */
@@ -38,87 +32,6 @@ struct sfp_bus {
 	bool started;
 };
 
-static void sfp_quirk_2500basex(const struct sfp_eeprom_id *id,
-				unsigned long *modes)
-{
-	phylink_set(modes, 2500baseX_Full);
-}
-
-static void sfp_quirk_ubnt_uf_instant(const struct sfp_eeprom_id *id,
-				      unsigned long *modes)
-{
-	/* Ubiquiti U-Fiber Instant module claims that support all transceiver
-	 * types including 10G Ethernet which is not truth. So clear all claimed
-	 * modes and set only one mode which module supports: 1000baseX_Full.
-	 */
-	phylink_zero(modes);
-	phylink_set(modes, 1000baseX_Full);
-}
-
-static const struct sfp_quirk sfp_quirks[] = {
-	{
-		// Alcatel Lucent G-010S-P can operate at 2500base-X, but
-		// incorrectly report 2500MBd NRZ in their EEPROM
-		.vendor = "ALCATELLUCENT",
-		.part = "G010SP",
-		.modes = sfp_quirk_2500basex,
-	}, {
-		// Alcatel Lucent G-010S-A can operate at 2500base-X, but
-		// report 3.2GBd NRZ in their EEPROM
-		.vendor = "ALCATELLUCENT",
-		.part = "3FE46541AA",
-		.modes = sfp_quirk_2500basex,
-	}, {
-		// Huawei MA5671A can operate at 2500base-X, but report 1.2GBd
-		// NRZ in their EEPROM
-		.vendor = "HUAWEI",
-		.part = "MA5671A",
-		.modes = sfp_quirk_2500basex,
-	}, {
-		.vendor = "UBNT",
-		.part = "UF-INSTANT",
-		.modes = sfp_quirk_ubnt_uf_instant,
-	},
-};
-
-static size_t sfp_strlen(const char *str, size_t maxlen)
-{
-	size_t size, i;
-
-	/* Trailing characters should be filled with space chars */
-	for (i = 0, size = 0; i < maxlen; i++)
-		if (str[i] != ' ')
-			size = i + 1;
-
-	return size;
-}
-
-static bool sfp_match(const char *qs, const char *str, size_t len)
-{
-	if (!qs)
-		return true;
-	if (strlen(qs) != len)
-		return false;
-	return !strncmp(qs, str, len);
-}
-
-static const struct sfp_quirk *sfp_lookup_quirk(const struct sfp_eeprom_id *id)
-{
-	const struct sfp_quirk *q;
-	unsigned int i;
-	size_t vs, ps;
-
-	vs = sfp_strlen(id->base.vendor_name, ARRAY_SIZE(id->base.vendor_name));
-	ps = sfp_strlen(id->base.vendor_pn, ARRAY_SIZE(id->base.vendor_pn));
-
-	for (i = 0, q = sfp_quirks; i < ARRAY_SIZE(sfp_quirks); i++, q++)
-		if (sfp_match(q->vendor, id->base.vendor_name, vs) &&
-		    sfp_match(q->part, id->base.vendor_pn, ps))
-			return q;
-
-	return NULL;
-}
-
 /**
  * sfp_parse_port() - Parse the EEPROM base ID, setting the port type
  * @bus: a pointer to the &struct sfp_bus structure for the sfp module
@@ -236,6 +149,10 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 	unsigned int br_min, br_nom, br_max;
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(modes) = { 0, };
 
+	phylink_set(modes, Autoneg);
+	phylink_set(modes, Pause);
+	phylink_set(modes, Asym_Pause);
+
 	/* Decode the bitrate information to MBd */
 	br_min = br_nom = br_max = 0;
 	if (id->base.br_nominal) {
@@ -359,14 +276,10 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 			phylink_set(modes, 1000baseX_Full);
 	}
 
-	if (bus->sfp_quirk)
+	if (bus->sfp_quirk && bus->sfp_quirk->modes)
 		bus->sfp_quirk->modes(id, modes);
 
 	bitmap_or(support, support, modes, __ETHTOOL_LINK_MODE_MASK_NBITS);
-
-	phylink_set(support, Autoneg);
-	phylink_set(support, Pause);
-	phylink_set(support, Asym_Pause);
 }
 EXPORT_SYMBOL_GPL(sfp_parse_support);
 
@@ -737,12 +650,13 @@ void sfp_link_down(struct sfp_bus *bus)
 }
 EXPORT_SYMBOL_GPL(sfp_link_down);
 
-int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id)
+int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
+		      const struct sfp_quirk *quirk)
 {
 	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
 	int ret = 0;
 
-	bus->sfp_quirk = sfp_lookup_quirk(id);
+	bus->sfp_quirk = quirk;
 
 	if (ops && ops->module_insert)
 		ret = ops->module_insert(bus->upstream, id);
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index f8d1742e0..0fdf5d6d4 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -165,6 +165,7 @@ static const enum gpiod_flags gpio_flags[] = {
  * on board (for a copper SFP) time to initialise.
  */
 #define T_WAIT			msecs_to_jiffies(50)
+#define T_WAIT_ROLLBALL		msecs_to_jiffies(25000)
 #define T_START_UP		msecs_to_jiffies(300)
 #define T_START_UP_BAD_GPON	msecs_to_jiffies(60000)
 
@@ -204,8 +205,11 @@ static const enum gpiod_flags gpio_flags[] = {
 
 /* SFP modules appear to always have their PHY configured for bus address
  * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
+ * RollBall SFPs access phy via SFP Enhanced Digital Diagnostic Interface
+ * via address 0x51 (mdio-i2c will use RollBall protocol on this address).
  */
-#define SFP_PHY_ADDR	22
+#define SFP_PHY_ADDR		22
+#define SFP_PHY_ADDR_ROLLBALL	17
 
 struct sff_data {
 	unsigned int gpios;
@@ -217,6 +221,7 @@ struct sfp {
 	struct i2c_adapter *i2c;
 	struct mii_bus *i2c_mii;
 	struct sfp_bus *sfp_bus;
+	enum mdio_i2c_proto mdio_protocol;
 	struct phy_device *mod_phy;
 	const struct sff_data *type;
 	size_t i2c_block_size;
@@ -233,6 +238,7 @@ struct sfp {
 	bool need_poll;
 
 	struct mutex st_mutex;			/* Protects state */
+	unsigned int state_hw_mask;
 	unsigned int state_soft_mask;
 	unsigned int state;
 	struct delayed_work poll;
@@ -249,6 +255,10 @@ struct sfp {
 	struct sfp_eeprom_id id;
 	unsigned int module_power_mW;
 	unsigned int module_t_start_up;
+	unsigned int module_t_wait;
+	bool tx_fault_ignore;
+
+	const struct sfp_quirk *quirk;
 
 #if IS_ENABLED(CONFIG_HWMON)
 	struct sfp_diag diag;
@@ -287,6 +297,18 @@ static bool sfp_module_supported(const struct sfp_eeprom_id *id)
 	    !memcmp(id->base.vendor_pn, "UF-INSTANT      ", 16))
 		return true;
 
+	/* SFP GPON module SK-LiNK SFP-GE-LX20 SM1310 and SM1550 Instant
+	 * has in its EEPROM stored phys id UNK instead of SFP. Therefore
+	 * mark this module explicitly as supported based on vendor name
+	 * and pn match.
+	 */
+	if (id->base.phys_id == SFF8024_ID_UNK &&
+	    id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP &&
+	    !memcmp(id->base.vendor_name, "SK-LINK         ", 16) &&
+	    (!memcmp(id->base.vendor_pn, "SFP-GE-LX20-SM13", 16) ||
+	     !memcmp(id->base.vendor_pn, "SFP-GE-LX-SM1550", 16)))
+		return true;
+
 	return false;
 }
 
@@ -303,6 +325,180 @@ static const struct of_device_id sfp_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, sfp_of_match);
 
+static void sfp_fixup_long_startup(struct sfp *sfp)
+{
+	sfp->module_t_start_up = T_START_UP_BAD_GPON;
+}
+
+static void sfp_fixup_ignore_tx_fault(struct sfp *sfp)
+{
+	sfp->tx_fault_ignore = true;
+}
+
+static void sfp_fixup_ruijie_gbic(struct sfp *sfp)
+{
+	sfp->mdio_protocol = MDIO_I2C_NONE;
+}
+
+static void sfp_fixup_halny_gsfp(struct sfp *sfp)
+{
+	/* Ignore the TX_FAULT and LOS signals on this module.
+	 * these are possibly used for other purposes on this
+	 * module, e.g. a serial port.
+	 */
+	sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
+}
+
+static void sfp_fixup_rollball(struct sfp *sfp)
+{
+	sfp->mdio_protocol = MDIO_I2C_ROLLBALL;
+	sfp->module_t_wait = T_WAIT_ROLLBALL;
+}
+
+static void sfp_fixup_rollball_cc(struct sfp *sfp)
+{
+	sfp_fixup_rollball(sfp);
+
+	/* Some RollBall SFPs may have wrong (zero) extended compliance code
+	 * burned in EEPROM. For PHY probing we need the correct one.
+	 */
+	sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SFI;
+}
+
+static void sfp_quirk_2500basex(const struct sfp_eeprom_id *id,
+				unsigned long *modes)
+{
+	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, modes);
+}
+
+static void sfp_quirk_10000baseSR(const struct sfp_eeprom_id *id,
+				  unsigned long *modes)
+{
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT, modes);
+}
+
+static void sfp_quirk_disable_autoneg(const struct sfp_eeprom_id *id,
+				      unsigned long *modes)
+{
+	linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, modes);
+}
+
+static void sfp_quirk_oem_2_5g(const struct sfp_eeprom_id *id,
+			       unsigned long *modes)
+{
+	/* Copper 2.5G SFP */
+	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, modes);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, modes);
+	sfp_quirk_disable_autoneg(id, modes);
+}
+
+static void sfp_quirk_ubnt_uf_instant(const struct sfp_eeprom_id *id,
+				      unsigned long *modes)
+{
+	/* Ubiquiti U-Fiber Instant module claims that support all transceiver
+	 * types including 10G Ethernet which is not truth. So clear all claimed
+	 * modes and set only one mode which module supports: 1000baseX_Full.
+	 */
+	linkmode_zero(modes);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, modes);
+}
+
+#define SFP_QUIRK(_v, _p, _r, _m, _f) \
+	{ .vendor = _v, .part = _p, .revision = _r, .modes = _m, .fixup = _f, }
+#define SFP_QUIRK_M(_v, _p, _r, _m) SFP_QUIRK(_v, _p, _r, _m, NULL)
+#define SFP_QUIRK_F(_v, _p, _r, _f) SFP_QUIRK(_v, _p, _r, NULL, _f)
+
+static const struct sfp_quirk sfp_quirks[] = {
+	// Ruijie MINI-GBIC-GT81 has a RL8211F PHY device, but it cannot
+	// reflect correct BMSR/ADVERTISE from the PHY.
+	SFP_QUIRK_F("RUIJIE", "MINI-GBIC-GT", "81", sfp_fixup_ruijie_gbic),
+
+	// Alcatel Lucent G-010S-P can operate at 2500base-X, but incorrectly
+	// report 2500MBd NRZ in their EEPROM
+	SFP_QUIRK_M("ALCATELLUCENT", "G010SP", '\0', sfp_quirk_2500basex),
+
+	// Alcatel Lucent G-010S-A can operate at 2500base-X, but report 3.2GBd
+	// NRZ in their EEPROM
+	SFP_QUIRK("ALCATELLUCENT", "3FE46541AA", '\0', sfp_quirk_2500basex,
+		  sfp_fixup_long_startup),
+
+	SFP_QUIRK_F("HALNy", "HL-GSFP", '\0', sfp_fixup_halny_gsfp),
+
+	// Huawei MA5671A can operate at 2500base-X, but report 1.2GBd NRZ in
+	// their EEPROM
+	SFP_QUIRK("HUAWEI", "MA5671A", '\0', sfp_quirk_2500basex,
+		  sfp_fixup_ignore_tx_fault),
+
+	// Lantech 8330-262D-E can operate at 2500base-X, but incorrectly report
+	// 2500MBd NRZ in their EEPROM
+	SFP_QUIRK_M("Lantech", "8330-262D-E", '\0', sfp_quirk_2500basex),
+
+	// CISCO PLRXPL-VC-S43-CG can operate at 10000baseSR, but not report
+	// in their EEPROM
+	SFP_QUIRK_M("CISCO-JDSU", "PLRXPL-VC-S43-CG", '\0', sfp_quirk_10000baseSR),
+
+	SFP_QUIRK_M("UBNT", "UF-INSTANT", '\0', sfp_quirk_ubnt_uf_instant),
+
+	// OEM SFP-2.5G-T can operate at 2500base-T, but not report
+	// in their EEPROM
+	SFP_QUIRK_M("OEM", "SFP-2.5G-T", '\0', sfp_quirk_oem_2_5g),
+	// TP-LINK TL-SM410U can operate at 2500base-T, but not report
+	// in their EEPROM
+	SFP_QUIRK_M("TP-LINK", "TL-SM410U", '\0', sfp_quirk_oem_2_5g),
+
+	SFP_QUIRK_F("ETU", "ESP-T5-R", '\0', sfp_fixup_rollball_cc),
+	SFP_QUIRK_F("OEM", "SFP-10G-T", '\0', sfp_fixup_rollball_cc),
+	SFP_QUIRK_F("OEM", "RTSFP-10", '\0', sfp_fixup_rollball_cc),
+	SFP_QUIRK_F("OEM", "RTSFP-10G", '\0', sfp_fixup_rollball_cc),
+	SFP_QUIRK_F("OEM", "TNBYV02-C0X-C3", '\0', sfp_fixup_rollball_cc),
+	SFP_QUIRK_F("Turris", "RTSFP-10", '\0', sfp_fixup_rollball),
+	SFP_QUIRK_F("Turris", "RTSFP-10G", '\0', sfp_fixup_rollball),
+	SFP_QUIRK_F("MIKE", "P60000BBC001-1", '\0', sfp_fixup_rollball),
+	SFP_QUIRK_F("JESS-LINK", "P60000BBC001-1", '\0', sfp_fixup_rollball),
+};
+
+static size_t sfp_strlen(const char *str, size_t maxlen)
+{
+	size_t size, i;
+
+	/* Trailing characters should be filled with space chars, but
+	 * some manufacturers can't read SFF-8472 and use NUL.
+	 */
+	for (i = 0, size = 0; i < maxlen; i++)
+		if (str[i] != ' ' && str[i] != '\0')
+			size = i + 1;
+
+	return size;
+}
+
+static bool sfp_match(const char *qs, const char *str, size_t len)
+{
+	if (!qs)
+		return true;
+	if (strlen(qs) != len)
+		return false;
+	return !strncmp(qs, str, len);
+}
+
+static const struct sfp_quirk *sfp_lookup_quirk(const struct sfp_eeprom_id *id)
+{
+	const struct sfp_quirk *q;
+	unsigned int i;
+	size_t vs, ps, rs;
+
+	vs = sfp_strlen(id->base.vendor_name, ARRAY_SIZE(id->base.vendor_name));
+	ps = sfp_strlen(id->base.vendor_pn, ARRAY_SIZE(id->base.vendor_pn));
+	rs = sfp_strlen(id->base.vendor_rev, ARRAY_SIZE(id->base.vendor_rev));
+
+	for (i = 0, q = sfp_quirks; i < ARRAY_SIZE(sfp_quirks); i++, q++)
+		if (sfp_match(q->vendor, id->base.vendor_name, vs) &&
+		    sfp_match(q->part, id->base.vendor_pn, ps) &&
+		    sfp_match(q->revision, id->base.vendor_rev, rs))
+			return q;
+
+	return NULL;
+}
+
 static unsigned long poll_jiffies;
 
 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
@@ -414,9 +610,6 @@ static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 
 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 {
-	struct mii_bus *i2c_mii;
-	int ret;
-
 	if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 		return -EINVAL;
 
@@ -424,7 +617,15 @@ static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 	sfp->read = sfp_i2c_read;
 	sfp->write = sfp_i2c_write;
 
-	i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
+	return 0;
+}
+
+static int sfp_i2c_mdiobus_create(struct sfp *sfp)
+{
+	struct mii_bus *i2c_mii;
+	int ret;
+
+	i2c_mii = mdio_i2c_alloc(sfp->dev, sfp->i2c, sfp->mdio_protocol);
 	if (IS_ERR(i2c_mii))
 		return PTR_ERR(i2c_mii);
 
@@ -442,6 +643,12 @@ static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 	return 0;
 }
 
+static void sfp_i2c_mdiobus_destroy(struct sfp *sfp)
+{
+	mdiobus_unregister(sfp->i2c_mii);
+	sfp->i2c_mii = NULL;
+}
+
 /* Interface */
 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 {
@@ -487,17 +694,18 @@ static void sfp_soft_set_state(struct sfp *sfp, unsigned int state)
 static void sfp_soft_start_poll(struct sfp *sfp)
 {
 	const struct sfp_eeprom_id *id = &sfp->id;
+	unsigned int mask = 0;
 
 	sfp->state_soft_mask = 0;
-	if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE &&
-	    !sfp->gpio[GPIO_TX_DISABLE])
-		sfp->state_soft_mask |= SFP_F_TX_DISABLE;
-	if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT &&
-	    !sfp->gpio[GPIO_TX_FAULT])
-		sfp->state_soft_mask |= SFP_F_TX_FAULT;
-	if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS &&
-	    !sfp->gpio[GPIO_LOS])
-		sfp->state_soft_mask |= SFP_F_LOS;
+	if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE)
+		mask |= SFP_F_TX_DISABLE;
+	if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT)
+		mask |= SFP_F_TX_FAULT;
+	if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS)
+		mask |= SFP_F_LOS;
+
+	// Poll the soft state for hardware pins we want to ignore
+	sfp->state_soft_mask = ~sfp->state_hw_mask & mask;
 
 	if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
 	    !sfp->need_poll)
@@ -511,10 +719,11 @@ static void sfp_soft_stop_poll(struct sfp *sfp)
 
 static unsigned int sfp_get_state(struct sfp *sfp)
 {
-	unsigned int state = sfp->get_state(sfp);
+	unsigned int soft = sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT);
+	unsigned int state;
 
-	if (state & SFP_F_PRESENT &&
-	    sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT))
+	state = sfp->get_state(sfp) & sfp->state_hw_mask;
+	if (state & SFP_F_PRESENT && soft)
 		state |= sfp_soft_get_state(sfp);
 
 	return state;
@@ -1448,12 +1657,12 @@ static void sfp_sm_phy_detach(struct sfp *sfp)
 	sfp->mod_phy = NULL;
 }
 
-static int sfp_sm_probe_phy(struct sfp *sfp, bool is_c45)
+static int sfp_sm_probe_phy(struct sfp *sfp, int addr, bool is_c45)
 {
 	struct phy_device *phy;
 	int err;
 
-	phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45);
+	phy = get_phy_device(sfp->i2c_mii, addr, is_c45);
 	if (phy == ERR_PTR(-ENODEV))
 		return PTR_ERR(phy);
 	if (IS_ERR(phy)) {
@@ -1548,6 +1757,14 @@ static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
 	}
 }
 
+static int sfp_sm_add_mdio_bus(struct sfp *sfp)
+{
+	if (sfp->mdio_protocol != MDIO_I2C_NONE)
+		return sfp_i2c_mdiobus_create(sfp);
+
+	return 0;
+}
+
 /* Probe a SFP for a PHY device if the module supports copper - the PHY
  * normally sits at I2C bus address 0x56, and may either be a clause 22
  * or clause 45 PHY.
@@ -1563,36 +1780,52 @@ static int sfp_sm_probe_for_phy(struct sfp *sfp)
 {
 	int err = 0;
 
-	switch (sfp->id.base.extended_cc) {
-	case SFF8024_ECC_10GBASE_T_SFI:
-	case SFF8024_ECC_10GBASE_T_SR:
-	case SFF8024_ECC_5GBASE_T:
-	case SFF8024_ECC_2_5GBASE_T:
-		err = sfp_sm_probe_phy(sfp, true);
+	switch (sfp->mdio_protocol) {
+	case MDIO_I2C_NONE:
 		break;
 
-	default:
-		if (sfp->id.base.e1000_base_t)
-			err = sfp_sm_probe_phy(sfp, false);
+	case MDIO_I2C_MARVELL_C22:
+		err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, false);
+		break;
+
+	case MDIO_I2C_C45:
+		err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, true);
+		break;
+
+	case MDIO_I2C_ROLLBALL:
+		err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR_ROLLBALL, true);
 		break;
 	}
+
 	return err;
 }
 
 static int sfp_module_parse_power(struct sfp *sfp)
 {
 	u32 power_mW = 1000;
+	bool supports_a2;
 
-	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
+	if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV10_2 &&
+	    sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
 		power_mW = 1500;
-	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
+	/* Added in Rev 11.9, but there is no compliance code for this */
+	if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV11_4 &&
+	    sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
 		power_mW = 2000;
 
+	/* Power level 1 modules (max. 1W) are always supported. */
+	if (power_mW <= 1000) {
+		sfp->module_power_mW = power_mW;
+		return 0;
+	}
+
+	supports_a2 = sfp->id.ext.sff8472_compliance !=
+				SFP_SFF8472_COMPLIANCE_NONE ||
+		      sfp->id.ext.diagmon & SFP_DIAGMON_DDM;
+
 	if (power_mW > sfp->max_power_mW) {
 		/* Module power specification exceeds the allowed maximum. */
-		if (sfp->id.ext.sff8472_compliance ==
-			SFP_SFF8472_COMPLIANCE_NONE &&
-		    !(sfp->id.ext.diagmon & SFP_DIAGMON_DDM)) {
+		if (!supports_a2) {
 			/* The module appears not to implement bus address
 			 * 0xa2, so assume that the module powers up in the
 			 * indicated mode.
@@ -1609,13 +1842,21 @@ static int sfp_module_parse_power(struct sfp *sfp)
 		}
 	}
 
+	if (!supports_a2) {
+		/* The module power level is below the host maximum and the
+		 * module appears not to implement bus address 0xa2, so assume
+		 * that the module powers up in the indicated mode.
+		 */
+		return 0;
+	}
+
 	/* If the module requires a higher power mode, but also requires
 	 * an address change sequence, warn the user that the module may
 	 * not be functional.
 	 */
-	if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE && power_mW > 1000) {
+	if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) {
 		dev_warn(sfp->dev,
-			 "Address Change Sequence not supported but module requies %u.%uW, module may not be functional\n",
+			 "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n",
 			 power_mW / 1000, (power_mW / 100) % 10);
 		return 0;
 	}
@@ -1692,7 +1933,7 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 {
 	/* SFP module inserted - read I2C data */
 	struct sfp_eeprom_id id;
-	bool cotsworks;
+	bool cotsworks, sklink;
 	u8 check;
 	int ret;
 
@@ -1747,10 +1988,16 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 	 */
 	cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
 
+	/* SK-LiNK do not seem to update the checksums when they
+	 * do the final programming with the final module part number,
+	 * serial number and date code.
+	 */
+	sklink = !memcmp(id.base.vendor_name, "SK-LINK         ", 16);
+
 	/* Validate the checksum over the base structure */
 	check = sfp_check(&id.base, sizeof(id.base) - 1);
 	if (check != id.base.cc_base) {
-		if (cotsworks) {
+		if (cotsworks || sklink) {
 			dev_warn(sfp->dev,
 				 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
 				 check, id.base.cc_base);
@@ -1819,11 +2066,33 @@ static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
 	if (ret < 0)
 		return ret;
 
-	if (!memcmp(id.base.vendor_name, "ALCATELLUCENT   ", 16) &&
-	    !memcmp(id.base.vendor_pn, "3FE46541AA      ", 16))
-		sfp->module_t_start_up = T_START_UP_BAD_GPON;
+	/* Initialise state bits to use from hardware */
+	sfp->state_hw_mask = SFP_F_PRESENT;
+	if (sfp->gpio[GPIO_TX_DISABLE])
+		sfp->state_hw_mask |= SFP_F_TX_DISABLE;
+	if (sfp->gpio[GPIO_TX_FAULT])
+		sfp->state_hw_mask |= SFP_F_TX_FAULT;
+	if (sfp->gpio[GPIO_LOS])
+		sfp->state_hw_mask |= SFP_F_LOS;
+
+	sfp->module_t_start_up = T_START_UP;
+	sfp->module_t_wait = T_WAIT;
+
+	sfp->tx_fault_ignore = false;
+
+	if (sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SFI ||
+	    sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SR ||
+	    sfp->id.base.extended_cc == SFF8024_ECC_5GBASE_T ||
+	    sfp->id.base.extended_cc == SFF8024_ECC_2_5GBASE_T)
+		sfp->mdio_protocol = MDIO_I2C_C45;
+	else if (sfp->id.base.e1000_base_t)
+		sfp->mdio_protocol = MDIO_I2C_MARVELL_C22;
 	else
-		sfp->module_t_start_up = T_START_UP;
+		sfp->mdio_protocol = MDIO_I2C_NONE;
+
+	sfp->quirk = sfp_lookup_quirk(&id);
+	if (sfp->quirk && sfp->quirk->fixup)
+		sfp->quirk->fixup(sfp);
 
 	return 0;
 }
@@ -1936,7 +2205,8 @@ static void sfp_sm_module(struct sfp *sfp, unsigned int event)
 			break;
 
 		/* Report the module insertion to the upstream device */
-		err = sfp_module_insert(sfp->sfp_bus, &sfp->id);
+		err = sfp_module_insert(sfp->sfp_bus, &sfp->id,
+					sfp->quirk);
 		if (err < 0) {
 			sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
 			break;
@@ -1995,6 +2265,8 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
 			sfp_module_stop(sfp->sfp_bus);
 		if (sfp->mod_phy)
 			sfp_sm_phy_detach(sfp);
+		if (sfp->i2c_mii)
+			sfp_i2c_mdiobus_destroy(sfp);
 		sfp_module_tx_disable(sfp);
 		sfp_soft_stop_poll(sfp);
 		sfp_sm_next(sfp, SFP_S_DOWN, 0);
@@ -2018,9 +2290,10 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
 
 		/* We need to check the TX_FAULT state, which is not defined
 		 * while TX_DISABLE is asserted. The earliest we want to do
-		 * anything (such as probe for a PHY) is 50ms.
+		 * anything (such as probe for a PHY) is 50ms (or more on
+		 * specific modules).
 		 */
-		sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT);
+		sfp_sm_next(sfp, SFP_S_WAIT, sfp->module_t_wait);
 		break;
 
 	case SFP_S_WAIT:
@@ -2034,8 +2307,8 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
 			 * deasserting.
 			 */
 			timeout = sfp->module_t_start_up;
-			if (timeout > T_WAIT)
-				timeout -= T_WAIT;
+			if (timeout > sfp->module_t_wait)
+				timeout -= sfp->module_t_wait;
 			else
 				timeout = 1;
 
@@ -2057,6 +2330,12 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
 				     sfp->sm_fault_retries == N_FAULT_INIT);
 		} else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
 	init_done:
+			/* Create mdiobus and start trying for PHY */
+			ret = sfp_sm_add_mdio_bus(sfp);
+			if (ret < 0) {
+				sfp_sm_next(sfp, SFP_S_FAIL, 0);
+				break;
+			}
 			sfp->sm_phy_retries = R_PHY_RETRY;
 			goto phy_probe;
 		}
@@ -2409,6 +2688,8 @@ static int sfp_probe(struct platform_device *pdev)
 				return PTR_ERR(sfp->gpio[i]);
 		}
 
+	sfp->state_hw_mask = SFP_F_PRESENT;
+
 	sfp->get_state = sfp_gpio_get_state;
 	sfp->set_state = sfp_gpio_set_state;
 
diff --git a/drivers/net/phy/sfp.h b/drivers/net/phy/sfp.h
index b83f70526..f533e2dd6 100644
--- a/drivers/net/phy/sfp.h
+++ b/drivers/net/phy/sfp.h
@@ -6,6 +6,14 @@
 
 struct sfp;
 
+struct sfp_quirk {
+	const char *vendor;
+	const char *part;
+	const char *revision;
+	void (*modes)(const struct sfp_eeprom_id *id, unsigned long *modes);
+	void (*fixup)(struct sfp *sfp);
+};
+
 struct sfp_socket_ops {
 	void (*attach)(struct sfp *sfp);
 	void (*detach)(struct sfp *sfp);
@@ -20,7 +28,8 @@ int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev);
 void sfp_remove_phy(struct sfp_bus *bus);
 void sfp_link_up(struct sfp_bus *bus);
 void sfp_link_down(struct sfp_bus *bus);
-int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id);
+int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
+		      const struct sfp_quirk *quirk);
 void sfp_module_remove(struct sfp_bus *bus);
 int sfp_module_start(struct sfp_bus *bus);
 void sfp_module_stop(struct sfp_bus *bus);
diff --git a/include/linux/mdio/mdio-i2c.h b/include/linux/mdio/mdio-i2c.h
index 751dab281..1c2114068 100644
--- a/include/linux/mdio/mdio-i2c.h
+++ b/include/linux/mdio/mdio-i2c.h
@@ -11,6 +11,14 @@ struct device;
 struct i2c_adapter;
 struct mii_bus;
 
-struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c);
+enum mdio_i2c_proto {
+	MDIO_I2C_NONE,
+	MDIO_I2C_MARVELL_C22,
+	MDIO_I2C_C45,
+	MDIO_I2C_ROLLBALL,
+};
+
+struct mii_bus *mdio_i2c_alloc(struct device *parent, struct i2c_adapter *i2c,
+			       enum mdio_i2c_proto protocol);
 
 #endif
-- 
2.34.1