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of_mdio: Fix broken PHY IRQ in case of probe deferral 

If an Ethernet PHY is initialized before the interrupt controller it is
connected to, a message like the following is printed:

    irq: no irq domain found for /interrupt-controller@e61c0000 !

However, the actual error is ignored, leading to a non-functional (POLL)
PHY interrupt later:

    Micrel KSZ8041RNLI ee700000.ethernet-ffffffff:01: attached PHY driver [Micrel KSZ8041RNLI] (mii_bus:phy_addr=ee700000.ethernet-ffffffff:01, irq=POLL)

Depending on whether the PHY driver will fall back to polling, Ethernet
may or may not work.

To fix this:
  1. Switch of_mdiobus_register_phy() from irq_of_parse_and_map() to
     of_irq_get().
     Unlike the former, the latter returns -EPROBE_DEFER if the
     interrupt controller is not yet available, so this condition can be
     detected.
     Other errors are handled the same as before, i.e. use the passed
     mdio->irq[addr] as interrupt.
  2. Propagate and handle errors from of_mdiobus_register_phy() and
     of_mdiobus_register_device().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geert Uytterhoeven 2017-10-18 13:54:03 +02:00 committed by David S. Miller
parent 7433a8d6fa
commit 66bdede495
1 changed files with 27 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/of/of_mdio.c
View File

@ -44,7 +44,7 @@ static int of_get_phy_id(struct device_node *device, u32 *phy_id)
return -EINVAL;
}
static void of_mdiobus_register_phy(struct mii_bus *mdio,
static int of_mdiobus_register_phy(struct mii_bus *mdio,
struct device_node *child, u32 addr)
{
struct phy_device *phy;
@ -60,9 +60,13 @@ static void of_mdiobus_register_phy(struct mii_bus *mdio,
else
phy = get_phy_device(mdio, addr, is_c45);
if (IS_ERR(phy))
return;
return PTR_ERR(phy);
rc = irq_of_parse_and_map(child, 0);
rc = of_irq_get(child, 0);
if (rc == -EPROBE_DEFER) {
phy_device_free(phy);
return rc;
}
if (rc > 0) {
phy->irq = rc;
mdio->irq[addr] = rc;
@ -84,22 +88,23 @@ static void of_mdiobus_register_phy(struct mii_bus *mdio,
if (rc) {
phy_device_free(phy);
of_node_put(child);
return;
return rc;
}
dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
child->name, addr);
return 0;
}
static void of_mdiobus_register_device(struct mii_bus *mdio,
struct device_node *child, u32 addr)
static int of_mdiobus_register_device(struct mii_bus *mdio,
struct device_node *child, u32 addr)
{
struct mdio_device *mdiodev;
int rc;
mdiodev = mdio_device_create(mdio, addr);
if (IS_ERR(mdiodev))
return;
return PTR_ERR(mdiodev);
/* Associate the OF node with the device structure so it
* can be looked up later.
@ -112,11 +117,12 @@ static void of_mdiobus_register_device(struct mii_bus *mdio,
if (rc) {
mdio_device_free(mdiodev);
of_node_put(child);
return;
return rc;
}
dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
child->name, addr);
return 0;
}
/* The following is a list of PHY compatible strings which appear in
@ -219,9 +225,11 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
}
if (of_mdiobus_child_is_phy(child))
of_mdiobus_register_phy(mdio, child, addr);
rc = of_mdiobus_register_phy(mdio, child, addr);
else
of_mdiobus_register_device(mdio, child, addr);
rc = of_mdiobus_register_device(mdio, child, addr);
if (rc)
goto unregister;
}
if (!scanphys)
@ -242,12 +250,19 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
dev_info(&mdio->dev, "scan phy %s at address %i\n",
child->name, addr);
if (of_mdiobus_child_is_phy(child))
of_mdiobus_register_phy(mdio, child, addr);
if (of_mdiobus_child_is_phy(child)) {
rc = of_mdiobus_register_phy(mdio, child, addr);
if (rc)
goto unregister;
}
}
}
return 0;
unregister:
mdiobus_unregister(mdio);
return rc;
}
EXPORT_SYMBOL(of_mdiobus_register);