diff options
| -rw-r--r-- | drivers/net/phy/Kconfig | 20 | ||||
| -rw-r--r-- | drivers/net/phy/realtek.c | 19 |
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 3dc0822d9c..631b52b1cf 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -202,6 +202,26 @@ config RTL8211X_PHY_FORCE_MASTER If unsure, say N. +config RTL8211F_PHY_FORCE_EEE_RXC_ON + bool "Ethernet PHY RTL8211F: do not stop receiving the xMII clock during LPI" + depends on PHY_REALTEK + default n + help + The IEEE 802.3az-2010 (EEE) standard provides a protocol to coordinate + transitions to/from a lower power consumption level (Low Power Idle + mode) based on link utilization. When no packets are being + transmitted, the system goes to Low Power Idle mode to save power. + + Under particular circumstances this setting can cause issues where + the PHY is unable to transmit or receive any packet when in LPI mode. + The problem is caused when the PHY is configured to stop receiving + the xMII clock while it is signaling LPI. For some PHYs the bit + configuring this behavior is set by the Linux kernel, causing the + issue in U-Boot on reboot if the PHY retains the register value. + + Default n, which means that the PHY state is not changed. To work + around the issues, change this setting to y. + config PHY_SMSC bool "Microchip(SMSC) Ethernet PHYs support" diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c index dd45e11b3a..8f1d759632 100644 --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -12,6 +12,7 @@ #define PHY_RTL8211x_FORCE_MASTER BIT(1) #define PHY_RTL8211E_PINE64_GIGABIT_FIX BIT(2) +#define PHY_RTL8211F_FORCE_EEE_RXC_ON BIT(3) #define PHY_AUTONEGOTIATE_TIMEOUT 5000 @@ -102,6 +103,15 @@ static int rtl8211e_probe(struct phy_device *phydev) return 0; } +static int rtl8211f_probe(struct phy_device *phydev) +{ +#ifdef CONFIG_RTL8211F_PHY_FORCE_EEE_RXC_ON + phydev->flags |= PHY_RTL8211F_FORCE_EEE_RXC_ON; +#endif + + return 0; +} + /* RealTek RTL8211x */ static int rtl8211x_config(struct phy_device *phydev) { @@ -151,6 +161,14 @@ static int rtl8211f_config(struct phy_device *phydev) { u16 reg; + if (phydev->flags & PHY_RTL8211F_FORCE_EEE_RXC_ON) { + unsigned int reg; + + reg = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1); + reg &= ~MDIO_PCS_CTRL1_CLKSTOP_EN; + phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, reg); + } + phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, BMCR_RESET); phy_write(phydev, MDIO_DEVAD_NONE, @@ -360,6 +378,7 @@ static struct phy_driver RTL8211F_driver = { .uid = 0x1cc916, .mask = 0xffffff, .features = PHY_GBIT_FEATURES, + .probe = &rtl8211f_probe, .config = &rtl8211f_config, .startup = &rtl8211f_startup, .shutdown = &genphy_shutdown, |