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author | Paul Burton <paul.burton@imgtec.com> | 2016-09-08 07:47:32 +0100 |
---|---|---|
committer | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2016-09-21 15:04:32 +0200 |
commit | 65f62b1ca12050c4e3b3e5ed641447918f4c4b7b (patch) | |
tree | c17495266a81704de96fc450d556eba23a5d8145 | |
parent | a29e45a9c468ba254bbf18886454c53ff16bec49 (diff) | |
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pci: Flip condition for detecting non-PCI parent devices
In pci_uclass_pre_probe an attempt is made to detect whether the parent
of a device is a PCI device and that the device is thus a bridge. This
was being done by checking whether the parent of the device is of the
UCLASS_ROOT class. This causes problems if the PCI controller is a child
of some other non-PCI node, for example a simple-bus node.
For example, if the device tree contains something like the following
then pci_uclass_pre_probe would incorrectly believe that the PCI
controller is a bridge, with a PCI parent:
/ {
some_child {
compatible = "simple-bus";
#address-cells = <1>;
#size-cells = <1>;
ranges = <>;
pci_controller: pci@10000000 {
compatible = "my-pci-controller";
device_type = "pci";
reg = <0x10000000 0x2000000>;
};
};
};
Avoid this incorrect detection of bridges by instead checking whether
the parent devices class is UCLASS_PCI and treating a device as a bridge
when this is true, making use of device_is_on_pci_bus to perform this
test.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
-rw-r--r-- | drivers/pci/pci-uclass.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index 342b78c..3b00e6a 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -837,7 +837,7 @@ static int pci_uclass_pre_probe(struct udevice *bus) hose = bus->uclass_priv; /* For bridges, use the top-level PCI controller */ - if (device_get_uclass_id(bus->parent) == UCLASS_ROOT) { + if (!device_is_on_pci_bus(bus)) { hose->ctlr = bus; ret = decode_regions(hose, gd->fdt_blob, bus->parent->of_offset, bus->of_offset); |