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 <sebastien.bourdelin@savoirfairelinux.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
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_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);
}