bcm53xx: backport MDIO bus clock initialization fix

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 48 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-4.4/060-0001-net-phy-Initialize-mdio-clock-at-probe-function.patch b/target/linux/bcm53xx/patches-4.4/060-0001-net-phy-Initialize-mdio-clock-at-probe-function.patch
new file mode 100644
index 0000000000..7678a70a32
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.4/060-0001-net-phy-Initialize-mdio-clock-at-probe-function.patch
@@ -0,0 +1,48 @@
+From bb1a619735b4660f21bce3e728b937640024b4ad Mon Sep 17 00:00:00 2001
+From: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
+Date: Wed, 8 Feb 2017 17:14:26 -0500
+Subject: [PATCH] net: phy: Initialize mdio clock at probe function
+
+USB PHYs need the MDIO clock divisor enabled earlier to work.
+Initialize mdio clock divisor in probe function. The ext bus
+bit available in the same register will be used by mdio mux
+to enable external mdio.
+
+Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com>
+Fixes: ddc24ae1 ("net: phy: Broadcom iProc MDIO bus driver")
+Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: Jon Mason <jon.mason@broadcom.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/phy/mdio-bcm-iproc.c | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+--- a/drivers/net/phy/mdio-bcm-iproc.c
++++ b/drivers/net/phy/mdio-bcm-iproc.c
+@@ -81,8 +81,6 @@ static int iproc_mdio_read(struct mii_bu
+ 	if (rc)
+ 		return rc;
+ 
+-	iproc_mdio_config_clk(priv->base);
+-
+ 	/* Prepare the read operation */
+ 	cmd = (MII_DATA_TA_VAL << MII_DATA_TA_SHIFT) |
+ 		(reg << MII_DATA_RA_SHIFT) |
+@@ -112,8 +110,6 @@ static int iproc_mdio_write(struct mii_b
+ 	if (rc)
+ 		return rc;
+ 
+-	iproc_mdio_config_clk(priv->base);
+-
+ 	/* Prepare the write operation */
+ 	cmd = (MII_DATA_TA_VAL << MII_DATA_TA_SHIFT) |
+ 		(reg << MII_DATA_RA_SHIFT) |
+@@ -163,6 +159,8 @@ static int iproc_mdio_probe(struct platf
+ 	bus->read = iproc_mdio_read;
+ 	bus->write = iproc_mdio_write;
+ 
++	iproc_mdio_config_clk(priv->base);
++
+ 	rc = of_mdiobus_register(bus, pdev->dev.of_node);
+ 	if (rc) {
+ 		dev_err(&pdev->dev, "MDIO bus registration failed\n");