From ef1f61aa03b30498a86ae0aa839f734bcb3737ec Mon Sep 17 00:00:00 2001 From: Sebastien Bourdelin Date: Fri, 28 Jul 2017 15:59:22 -0400 Subject: [PATCH] net: phy: micrel: add an option to disable gigabit for the KSZ9031 The environment variable "disable_giga" can now be used to disable 1000baseTx on the Micrel's KSZ9031. Signed-off-by: Sebastien Bourdelin Acked-by: Joe Hershberger --- drivers/net/phy/micrel_ksz90x1.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/net/phy/micrel_ksz90x1.c b/drivers/net/phy/micrel_ksz90x1.c index 785143d..20f8a55 100644 --- a/drivers/net/phy/micrel_ksz90x1.c +++ b/drivers/net/phy/micrel_ksz90x1.c @@ -335,12 +335,40 @@ static int ksz9031_phy_extwrite(struct phy_device *phydev, int addr, static int ksz9031_config(struct phy_device *phydev) { int ret; + ret = ksz9031_of_config(phydev); if (ret) return ret; ret = ksz9031_center_flp_timing(phydev); if (ret) return ret; + + /* add an option to disable the gigabit feature of this PHY */ + if (getenv("disable_giga")) { + unsigned features; + unsigned bmcr; + + /* disable speed 1000 in features supported by the PHY */ + features = phydev->drv->features; + features &= ~(SUPPORTED_1000baseT_Half | + SUPPORTED_1000baseT_Full); + phydev->advertising = phydev->supported = features; + + /* disable speed 1000 in Basic Control Register */ + bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR); + bmcr &= ~(1 << 6); + phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, bmcr); + + /* disable speed 1000 in 1000Base-T Control Register */ + phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, 0); + + /* start autoneg */ + genphy_config_aneg(phydev); + genphy_restart_aneg(phydev); + + return 0; + } + return genphy_config(phydev); }