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pci: pci-uclass: Add support for Enhanced Allocation in Bridges

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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>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Suneel Garapati
2019-10-19 15:52:32 -07:00
committed by Stefan Roese
parent 4cf56ec07f
commit 636cc1773a
1 changed files with 18 additions and 6 deletions
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24
drivers/pci/pci-uclass.c
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@@ -620,10 +620,19 @@ int dm_pci_hose_probe_bus(struct udevice *bus)
{ {
int sub_bus; int sub_bus;
int ret; int ret;
int ea_pos;
u8 reg;
debug("%s\n", __func__); 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),
&reg);
sub_bus = reg;
} else {
sub_bus = pci_get_bus_max() + 1;
}
debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name); debug("%s: bus = %d/%s\n", __func__, sub_bus, bus->name);
dm_pciauto_prescan_setup_bridge(bus, sub_bus); dm_pciauto_prescan_setup_bridge(bus, sub_bus);
@@ -633,12 +642,15 @@ int dm_pci_hose_probe_bus(struct udevice *bus)
ret); ret);
return ret; return ret;
} }
if (sub_bus != bus->seq) {
printf("%s: Internal error, bus '%s' got seq %d, expected %d\n", if (!ea_pos) {
__func__, bus->name, bus->seq, sub_bus); if (sub_bus != bus->seq) {
return -EPIPE; debug("%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); dm_pciauto_postscan_setup_bridge(bus, sub_bus);
return sub_bus; return sub_bus;