net: phy: consolidate PHY reset in phy_init_hw()

There are quite a lot of drivers touching a PHY device MII_BMCR
register to reset the PHY without taking care of:

1) ensuring that BMCR_RESET is cleared after a given timeout
2) the PHY state machine resuming to the proper state and re-applying
potentially changed settings such as auto-negotiation

Introduce phy_poll_reset() which will take care of polling the MII_BMCR
for the BMCR_RESET bit to be cleared after a given timeout or return a
timeout error code.

In order to make sure the PHY is in a correct state, phy_init_hw() first
issues a software reset through MII_BMCR and then applies any fixups.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/Documentation/networking/phy.txt b/Documentation/networking/phy.txt
index d5b1a39..ebf2707 100644 (file)
--- a/Documentation/networking/phy.txt
+++ b/Documentation/networking/phy.txt
@@ -255,7 +255,8 @@ Writing a PHY driver
 
    config_init: configures PHY into a sane state after a reset.
      For instance, a Davicom PHY requires descrambling disabled.
-   probe: Does any setup needed by the driver
+   probe: Allocate phy->priv, optionally refuse to bind.
+   PHY may not have been reset or had fixups run yet.
    suspend/resume: power management
    config_aneg: Changes the speed/duplex/negotiation settings
    read_status: Reads the current speed/duplex/negotiation settings

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 5d7101b..e3dd691 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -318,6 +318,7 @@ int phy_mii_ioctl(struct phy_device *phydev,
 {
        struct mii_ioctl_data *mii_data = if_mii(ifr);
        u16 val = mii_data->val_in;
+       int ret = 0;
 
        switch (cmd) {
        case SIOCGMIIPHY:
@@ -362,7 +363,7 @@ int phy_mii_ioctl(struct phy_device *phydev,
 
                if (mii_data->reg_num == MII_BMCR &&
                    val & BMCR_RESET)
-                       phy_init_hw(phydev);
+                       ret = phy_init_hw(phydev);
                break;
 
        case SIOCSHWTSTAMP:
@@ -374,7 +375,7 @@ int phy_mii_ioctl(struct phy_device *phydev,
                return -EOPNOTSUPP;
        }
 
-       return 0;
+       return ret;
 }
 EXPORT_SYMBOL(phy_mii_ioctl);
 

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 6db3659..5a619f0 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -364,7 +364,11 @@ int phy_device_register(struct phy_device *phydev)
        phydev->bus->phy_map[phydev->addr] = phydev;
 
        /* Run all of the fixups for this PHY */
-       phy_scan_fixups(phydev);
+       err = phy_init_hw(phydev);
+       if (err) {
+               pr_err("PHY %d failed to initialize\n", phydev->addr);
+               goto out;
+       }
 
        err = device_add(&phydev->dev);
        if (err) {
@@ -497,6 +501,47 @@ void phy_disconnect(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(phy_disconnect);
 
+/**
+ * phy_poll_reset - Safely wait until a PHY reset has properly completed
+ * @phydev: The PHY device to poll
+ *
+ * Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
+ *   published in 2008, a PHY reset may take up to 0.5 seconds.  The MII BMCR
+ *   register must be polled until the BMCR_RESET bit clears.
+ *
+ *   Furthermore, any attempts to write to PHY registers may have no effect
+ *   or even generate MDIO bus errors until this is complete.
+ *
+ *   Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
+ *   standard and do not fully reset after the BMCR_RESET bit is set, and may
+ *   even *REQUIRE* a soft-reset to properly restart autonegotiation.  In an
+ *   effort to support such broken PHYs, this function is separate from the
+ *   standard phy_init_hw() which will zero all the other bits in the BMCR
+ *   and reapply all driver-specific and board-specific fixups.
+ */
+static int phy_poll_reset(struct phy_device *phydev)
+{
+       /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
+       unsigned int retries = 12;
+       int ret;
+
+       do {
+               msleep(50);
+               ret = phy_read(phydev, MII_BMCR);
+               if (ret < 0)
+                       return ret;
+       } while (ret & BMCR_RESET && --retries);
+       if (ret & BMCR_RESET)
+               return -ETIMEDOUT;
+
+       /*
+        * Some chips (smsc911x) may still need up to another 1ms after the
+        * BMCR_RESET bit is cleared before they are usable.
+        */
+       msleep(1);
+       return 0;
+}
+
 int phy_init_hw(struct phy_device *phydev)
 {
        int ret;
@@ -504,12 +549,21 @@ int phy_init_hw(struct phy_device *phydev)
        if (!phydev->drv || !phydev->drv->config_init)
                return 0;
 
+       ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
+       if (ret < 0)
+               return ret;
+
+       ret = phy_poll_reset(phydev);
+       if (ret < 0)
+               return ret;
+
        ret = phy_scan_fixups(phydev);
        if (ret < 0)
                return ret;
 
        return phydev->drv->config_init(phydev);
 }
+EXPORT_SYMBOL(phy_init_hw);
 
 /**
  * phy_attach_direct - attach a network device to a given PHY device pointer