From: Suneel Garapati sgarapati@marvell.com
If Enhanced Allocation capability is present in bridges, use it to read the fixed sub-ordinate bus number.
Signed-off-by: Suneel Garapati sgarapati@marvell.com --- drivers/pci/pci-uclass.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index f17e83565c..51f7135723 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -599,10 +599,20 @@ int dm_pci_hose_probe_bus(struct udevice *bus) { int sub_bus; int ret; + int ea_pos; + u8 reg;
debug("%s\n", __func__);
- sub_bus = pci_get_bus_max() + 1; + ea_pos = dm_pci_find_capability(bus, PCI_CAP_ID_EA); + + if (ea_pos) { + dm_pci_read_config8(bus, ea_pos + sizeof(u32) + sizeof(u8), + ®); + sub_bus = reg; + } else { + sub_bus = pci_get_bus_max() + 1; + } debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name); dm_pciauto_prescan_setup_bridge(bus, sub_bus);
@@ -612,12 +622,15 @@ int dm_pci_hose_probe_bus(struct udevice *bus) ret); return ret; } - if (sub_bus != bus->seq) { - printf("%s: Internal error, bus '%s' got seq %d, expected %d\n", - __func__, bus->name, bus->seq, sub_bus); - return -EPIPE; + + if (!ea_pos) { + if (sub_bus != bus->seq) { + printf("%s: Internal error, bus '%s' got seq %d, expected %d\n", + __func__, bus->name, bus->seq, sub_bus); + return -EPIPE; + } + sub_bus = pci_get_bus_max(); } - sub_bus = pci_get_bus_max(); dm_pciauto_postscan_setup_bridge(bus, sub_bus);
return sub_bus;