ARM: i.MX6: add ethernet phy fixup for KSZ9031

The KSZ9031 is used on the i.MX6 based Data Modul eDM-QMX6
board. It needs the same fixup to the rx/tx delays as other
i.MX6 boards.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 57f350c..db1db78 100644 (file)
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -115,6 +115,27 @@ static int ksz9021rn_phy_fixup(struct phy_device *phydev)
        return 0;
 }
 
+static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val)
+{
+       phy_write(dev, 0x0d, device);
+       phy_write(dev, 0x0e, reg);
+       phy_write(dev, 0x0d, (1 << 14) | device);
+       phy_write(dev, 0x0e, val);
+}
+
+static int ksz9031rn_phy_fixup(struct phy_device *dev)
+{
+       /*
+        * min rx data delay, max rx/tx clock delay,
+        * min rx/tx control delay
+        */
+       mmd_write_reg(dev, 2, 4, 0);
+       mmd_write_reg(dev, 2, 5, 0);
+       mmd_write_reg(dev, 2, 8, 0x003ff);
+
+       return 0;
+}
+
 static int ar8031_phy_fixup(struct phy_device *dev)
 {
        u16 val;
@@ -169,6 +190,8 @@ static void __init imx6q_enet_phy_init(void)
        if (IS_BUILTIN(CONFIG_PHYLIB)) {
                phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
                                ksz9021rn_phy_fixup);
+               phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
+                               ksz9031rn_phy_fixup);
                phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
                                ar8031_phy_fixup);
        }