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authorAlexandru Tachici <alexandru.tachici@analog.com>2022-11-15 14:44:34 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-11-17 12:38:37 +0300
commit809ff97a677ff85dfb7ce2b63be261d1633dcf29 (patch)
tree66fc351ac1deaa2f7420c23ecf594f2754798faf
parente103ba33998d0f25653cc8ebe745b68d1ee10cda (diff)
downloadlinux-809ff97a677ff85dfb7ce2b63be261d1633dcf29.tar.xz
net: usb: smsc95xx: fix external PHY reset
An external PHY needs settling time after power up or reset. In the bind() function an mdio bus is registered. If at this point the external PHY is still initialising, no valid PHY ID will be read and on phy_find_first() the bind() function will fail. If an external PHY is present, wait the maximum time specified in 802.3 45.2.7.1.1. Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support") Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20221115114434.9991-2-alexandru.tachici@analog.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
-rw-r--r--drivers/net/usb/smsc95xx.c46
1 files changed, 42 insertions, 4 deletions
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index bfb58c91db04..32d2c60d334d 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -66,6 +66,7 @@ struct smsc95xx_priv {
spinlock_t mac_cr_lock;
u8 features;
u8 suspend_flags;
+ bool is_internal_phy;
struct irq_chip irqchip;
struct irq_domain *irqdomain;
struct fwnode_handle *irqfwnode;
@@ -252,6 +253,43 @@ done:
mutex_unlock(&dev->phy_mutex);
}
+static int smsc95xx_mdiobus_reset(struct mii_bus *bus)
+{
+ struct smsc95xx_priv *pdata;
+ struct usbnet *dev;
+ u32 val;
+ int ret;
+
+ dev = bus->priv;
+ pdata = dev->driver_priv;
+
+ if (pdata->is_internal_phy)
+ return 0;
+
+ mutex_lock(&dev->phy_mutex);
+
+ ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
+ if (ret < 0)
+ goto reset_out;
+
+ val |= PM_CTL_PHY_RST_;
+
+ ret = smsc95xx_write_reg(dev, PM_CTRL, val);
+ if (ret < 0)
+ goto reset_out;
+
+ /* Driver has no knowledge at this point about the external PHY.
+ * The 802.3 specifies that the reset process shall
+ * be completed within 0.5 s.
+ */
+ fsleep(500000);
+
+reset_out:
+ mutex_unlock(&dev->phy_mutex);
+
+ return 0;
+}
+
static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
{
struct usbnet *dev = bus->priv;
@@ -1052,7 +1090,6 @@ static void smsc95xx_handle_link_change(struct net_device *net)
static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
{
struct smsc95xx_priv *pdata;
- bool is_internal_phy;
char usb_path[64];
int ret, phy_irq;
u32 val;
@@ -1133,13 +1170,14 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
if (ret < 0)
goto free_mdio;
- is_internal_phy = !(val & HW_CFG_PSEL_);
- if (is_internal_phy)
+ pdata->is_internal_phy = !(val & HW_CFG_PSEL_);
+ if (pdata->is_internal_phy)
pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
pdata->mdiobus->priv = dev;
pdata->mdiobus->read = smsc95xx_mdiobus_read;
pdata->mdiobus->write = smsc95xx_mdiobus_write;
+ pdata->mdiobus->reset = smsc95xx_mdiobus_reset;
pdata->mdiobus->name = "smsc95xx-mdiobus";
pdata->mdiobus->parent = &dev->udev->dev;
@@ -1160,7 +1198,7 @@ static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
}
pdata->phydev->irq = phy_irq;
- pdata->phydev->is_internal = is_internal_phy;
+ pdata->phydev->is_internal = pdata->is_internal_phy;
/* detect device revision as different features may be available */
ret = smsc95xx_read_reg(dev, ID_REV, &val);