Merge branch 'phy_reset'

Florian Fainelli says:

====================
net: phy: consolidate PHY reset

This patchset consolidates the PHY reset through the MII BMCR
register by using a central place were this is done.

This patchset resumes the work Kyle Moffett started here:
https://lkml.org/lkml/2011/10/20/301

Note that at this point, drivers doing funky things after issuing
a PHY reset using phy_init_hw() will still suffer from PHY state
machine problems, this will be taken care of later on.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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

drivers/net/ethernet/adi/bfin_mac.c

@@ -1557,7 +1557,6 @@ static int bfin_mac_open(struct net_device *dev)
 		return ret;
 
 	phy_start(lp->phydev);
-	phy_write(lp->phydev, MII_BMCR, BMCR_RESET);
 	setup_system_regs(dev);
 	setup_mac_addr(dev->dev_addr);
 

drivers/net/ethernet/aeroflex/greth.c

@@ -1361,7 +1361,7 @@ static int greth_mdio_init(struct greth_private *greth)
 		timeout = jiffies + 6*HZ;
 		while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
 		}
-		genphy_read_status(greth->phy);
+		phy_read_status(greth->phy);
 		greth_link_change(greth->netdev);
 	}
 

drivers/net/ethernet/marvell/mv643xx_eth.c

@@ -2066,23 +2066,6 @@ static inline void oom_timer_wrapper(unsigned long data)
 	napi_schedule(&mp->napi);
 }
 
-static void phy_reset(struct mv643xx_eth_private *mp)
-{
-	int data;
-
-	data = phy_read(mp->phy, MII_BMCR);
-	if (data < 0)
-		return;
-
-	data |= BMCR_RESET;
-	if (phy_write(mp->phy, MII_BMCR, data) < 0)
-		return;
-
-	do {
-		data = phy_read(mp->phy, MII_BMCR);
-	} while (data >= 0 && data & BMCR_RESET);
-}
-
 static void port_start(struct mv643xx_eth_private *mp)
 {
 	u32 pscr;
@@ -2095,7 +2078,7 @@ static void port_start(struct mv643xx_eth_private *mp)
 		struct ethtool_cmd cmd;
 
 		mv643xx_eth_get_settings(mp->dev, &cmd);
-		phy_reset(mp);
+		phy_init_hw(mp->phy);
 		mv643xx_eth_set_settings(mp->dev, &cmd);
 	}
 
@@ -2763,8 +2746,6 @@ static void phy_init(struct mv643xx_eth_private *mp, int speed, int duplex)
 {
 	struct phy_device *phy = mp->phy;
 
-	phy_reset(mp);
-
 	if (speed == 0) {
 		phy->autoneg = AUTONEG_ENABLE;
 		phy->speed = 0;

drivers/net/ethernet/marvell/pxa168_eth.c

@@ -320,23 +320,6 @@ static void ethernet_phy_set_addr(struct pxa168_eth_private *pep, int phy_addr)
 	wrl(pep, PHY_ADDRESS, reg_data);
 }
 
-static void ethernet_phy_reset(struct pxa168_eth_private *pep)
-{
-	int data;
-
-	data = phy_read(pep->phy, MII_BMCR);
-	if (data < 0)
-		return;
-
-	data |= BMCR_RESET;
-	if (phy_write(pep->phy, MII_BMCR, data) < 0)
-		return;
-
-	do {
-		data = phy_read(pep->phy, MII_BMCR);
-	} while (data >= 0 && data & BMCR_RESET);
-}
-
 static void rxq_refill(struct net_device *dev)
 {
 	struct pxa168_eth_private *pep = netdev_priv(dev);
@@ -645,7 +628,7 @@ static void eth_port_start(struct net_device *dev)
 		struct ethtool_cmd cmd;
 
 		pxa168_get_settings(pep->dev, &cmd);
-		ethernet_phy_reset(pep);
+		phy_init_hw(pep->phy);
 		pxa168_set_settings(pep->dev, &cmd);
 	}
 
@@ -1382,7 +1365,6 @@ static struct phy_device *phy_scan(struct pxa168_eth_private *pep, int phy_addr)
 static void phy_init(struct pxa168_eth_private *pep, int speed, int duplex)
 {
 	struct phy_device *phy = pep->phy;
-	ethernet_phy_reset(pep);
 
 	phy_attach(pep->dev, dev_name(&phy->dev), PHY_INTERFACE_MODE_MII);
 

drivers/net/ethernet/renesas/sh_eth.c

@@ -1704,7 +1704,10 @@ static int sh_eth_phy_start(struct net_device *ndev)
 		return ret;
 
 	/* reset phy - this also wakes it from PDOWN */
-	phy_write(mdp->phydev, MII_BMCR, BMCR_RESET);
+	ret = phy_init_hw(mdp->phydev);
+	if (ret)
+		return ret;
+
 	phy_start(mdp->phydev);
 
 	return 0;

drivers/net/ethernet/toshiba/tc35815.c

@@ -1170,19 +1170,12 @@ static int tc35815_tx_full(struct net_device *dev)
 static void tc35815_restart(struct net_device *dev)
 {
 	struct tc35815_local *lp = netdev_priv(dev);
+	int ret;
 
 	if (lp->phy_dev) {
-		int timeout;
-
-		phy_write(lp->phy_dev, MII_BMCR, BMCR_RESET);
-		timeout = 100;
-		while (--timeout) {
-			if (!(phy_read(lp->phy_dev, MII_BMCR) & BMCR_RESET))
-				break;
-			udelay(1);
-		}
-		if (!timeout)
-			printk(KERN_ERR "%s: BMCR reset failed.\n", dev->name);
+		ret = phy_init_hw(lp->phy_dev);
+		if (ret)
+			printk(KERN_ERR "%s: PHY init failed.\n", dev->name);
 	}
 
 	spin_lock_bh(&lp->rx_lock);

drivers/net/phy/phy.c

@@ -289,6 +289,7 @@ int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 	cmd->supported = phydev->supported;
 
 	cmd->advertising = phydev->advertising;
+	cmd->lp_advertising = phydev->lp_advertising;
 
 	ethtool_cmd_speed_set(cmd, phydev->speed);
 	cmd->duplex = phydev->duplex;
@@ -317,6 +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:
@@ -360,11 +362,8 @@ int phy_mii_ioctl(struct phy_device *phydev,
 			      mii_data->reg_num, val);
 
 		if (mii_data->reg_num == MII_BMCR &&
-		    val & BMCR_RESET &&
-		    phydev->drv->config_init) {
-			phy_scan_fixups(phydev);
-			phydev->drv->config_init(phydev);
-		}
+		    val & BMCR_RESET)
+			ret = phy_init_hw(phydev);
 		break;
 
 	case SIOCSHWTSTAMP:
@@ -376,7 +375,7 @@ int phy_mii_ioctl(struct phy_device *phydev,
 		return -EOPNOTSUPP;
 	}
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL(phy_mii_ioctl);
 

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
@@ -839,6 +893,8 @@ int genphy_read_status(struct phy_device *phydev)
 	if (err)
 		return err;
 
+	phydev->lp_advertising = 0;
+
 	if (AUTONEG_ENABLE == phydev->autoneg) {
 		if (phydev->supported & (SUPPORTED_1000baseT_Half
 					| SUPPORTED_1000baseT_Full)) {
@@ -852,6 +908,8 @@ int genphy_read_status(struct phy_device *phydev)
 			if (adv < 0)
 				return adv;
 
+			phydev->lp_advertising =
+				mii_stat1000_to_ethtool_lpa_t(lpagb);
 			lpagb &= adv << 2;
 		}
 
@@ -860,6 +918,8 @@ int genphy_read_status(struct phy_device *phydev)
 		if (lpa < 0)
 			return lpa;
 
+		phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(lpa);
+
 		adv = phy_read(phydev, MII_ADVERTISE);
 
 		if (adv < 0)

include/linux/phy.h

@@ -287,8 +287,8 @@ struct phy_c45_device_ids {
  * adjust_state: Callback for the enet driver to respond to
  * changes in the state machine.
  *
- * speed, duplex, pause, supported, advertising, and
- * autoneg are used like in mii_if_info
+ * speed, duplex, pause, supported, advertising, lp_advertising,
+ * and autoneg are used like in mii_if_info
  *
  * interrupts currently only supports enabled or disabled,
  * but could be changed in the future to support enabling
@@ -340,6 +340,7 @@ struct phy_device {
 	/* See mii.h for more info */
 	u32 supported;
 	u32 advertising;
+	u32 lp_advertising;
 
 	int autoneg;