Re: [U-Boot] [PATCH] net: phy: realtek: Introduce quirk to mark RXC not stoppable

On Wed, Jan 23, 2019 at 7:57 AM Carlo Caione ccaione@baylibre.com wrote:

When EEE is supported by the PHY and the driver allows it, libphy in the kernel is configuring the PHY to stop receiving the xMII clock while it is signaling LPI. While this (usually) works fine in the kernel this is causing issues in U-Boot when rebooting from the linux kernel with this bit set (without having the possibility to reset the PHY) where the PHY suddenly stops working.

A new quirk is introduced to unconditionally reset this bit. If the quirk is not enabled using the proper configuration symbol, the PHY state is not changed.

Signed-off-by: Carlo Caione ccaione@baylibre.com

Other than a few nits below,

Acked-by: Joe Hershberger joe.hershberger@ni.com

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Hi Joe, just an heads up that this patch depends on the MMD helpers patch I submitted earlier.

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drivers/net/phy/Kconfig | 19 +++++++++++++++++++ drivers/net/phy/realtek.c | 19 +++++++++++++++++++ 2 files changed, 38 insertions(+)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 3dc0822d9c..d0dab3014e 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -202,6 +202,25 @@ 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) standar provides a protocol to coordinate
  

Typo: standard

•     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. When not stated otherwise
  

•     this bit is set by libphy in the linux kernel.
  

This seems to be copied from Linux, please update to describe what happens in U-Boot.

•     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 b3e6578df9..fa11696fe2 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

@@ -75,6 +76,15 @@ 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) { @@ -124,6 +134,14 @@ 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,
  

@@ -333,6 +351,7 @@ 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,
  

-- 2.19.1

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