net: phy: enable interrupts when PHY is attached already

This patch is a step towards allowing PHY drivers to handle more
interrupt sources than just link change. E.g. several PHY's have
built-in temperature monitoring and can raise an interrupt if a
temperature threshold is exceeded. We may be interested in such
interrupts also if the phylib state machine isn't started.
Therefore move enabling interrupts to phy_request_interrupt().

v2:
- patch added to series

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index e888542..4ba71dc 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -799,10 +799,10 @@ static int phy_enable_interrupts(struct phy_device *phydev)
 }
 
 /**
- * phy_request_interrupt - request interrupt for a PHY device
+ * phy_request_interrupt - request and enable interrupt for a PHY device
  * @phydev: target phy_device struct
  *
- * Description: Request the interrupt for the given PHY.
+ * Description: Request and enable the interrupt for the given PHY.
  *   If this fails, then we set irq to PHY_POLL.
  *   This should only be called with a valid IRQ number.
  */
@@ -817,11 +817,31 @@ void phy_request_interrupt(struct phy_device *phydev)
                phydev_warn(phydev, "Error %d requesting IRQ %d, falling back to polling\n",
                            err, phydev->irq);
                phydev->irq = PHY_POLL;
+       } else {
+               if (phy_enable_interrupts(phydev)) {
+                       phydev_warn(phydev, "Can't enable interrupt, falling back to polling\n");
+                       phy_free_interrupt(phydev);
+                       phydev->irq = PHY_POLL;
+               }
        }
 }
 EXPORT_SYMBOL(phy_request_interrupt);
 
 /**
+ * phy_free_interrupt - disable and free interrupt for a PHY device
+ * @phydev: target phy_device struct
+ *
+ * Description: Disable and free the interrupt for the given PHY.
+ *   This should only be called with a valid IRQ number.
+ */
+void phy_free_interrupt(struct phy_device *phydev)
+{
+       phy_disable_interrupts(phydev);
+       free_irq(phydev->irq, phydev);
+}
+EXPORT_SYMBOL(phy_free_interrupt);
+
+/**
  * phy_stop - Bring down the PHY link, and stop checking the status
  * @phydev: target phy_device struct
  */
@@ -835,9 +855,6 @@ void phy_stop(struct phy_device *phydev)
 
        mutex_lock(&phydev->lock);
 
-       if (phy_interrupt_is_valid(phydev))
-               phy_disable_interrupts(phydev);
-
        phydev->state = PHY_HALTED;
 
        mutex_unlock(&phydev->lock);
@@ -864,8 +881,6 @@ EXPORT_SYMBOL(phy_stop);
  */
 void phy_start(struct phy_device *phydev)
 {
-       int err;
-
        mutex_lock(&phydev->lock);
 
        if (phydev->state != PHY_READY && phydev->state != PHY_HALTED) {
@@ -877,13 +892,6 @@ void phy_start(struct phy_device *phydev)
        /* if phy was suspended, bring the physical link up again */
        __phy_resume(phydev);
 
-       /* make sure interrupts are enabled for the PHY */
-       if (phy_interrupt_is_valid(phydev)) {
-               err = phy_enable_interrupts(phydev);
-               if (err < 0)
-                       goto out;
-       }
-
        phydev->state = PHY_UP;
 
        phy_start_machine(phydev);

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 8b4fc3b..2c879ba 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1016,7 +1016,7 @@ void phy_disconnect(struct phy_device *phydev)
                phy_stop(phydev);
 
        if (phy_interrupt_is_valid(phydev))
-               free_irq(phydev->irq, phydev);
+               phy_free_interrupt(phydev);
 
        phydev->adjust_link = NULL;
 

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7180b1d..72e1196 100644 (file)
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1147,6 +1147,7 @@ int phy_ethtool_ksettings_set(struct phy_device *phydev,
                              const struct ethtool_link_ksettings *cmd);
 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd);
 void phy_request_interrupt(struct phy_device *phydev);
+void phy_free_interrupt(struct phy_device *phydev);
 void phy_print_status(struct phy_device *phydev);
 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed);
 void phy_remove_link_mode(struct phy_device *phydev, u32 link_mode);