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Subject[patch 2.6] remove PCI_BRIDGE_CTL_VGA handling from setup-bus.c
The setup-bus code doesn't work correctly for configurations
with more than one display adapter in the same PCI domain.
This stuff actually is a leftover of an early 2.4 PCI setup code
and apparently it stopped working after some "bridge_ctl" changes.
So the best thing we can do is just to remove it and rely on the fact
that any firmware *has* to configure VGA port forwarding for the boot
display device properly.

But then we need to ensure that the bus->bridge_ctl will always
contain valid information collected at the probe time, therefore
the following change in pci_scan_bridge() is needed.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>

--- 2.6.13-rc3/drivers/pci/probe.c Thu Jul 14 11:09:52 2005
+++ linux/drivers/pci/probe.c Thu Jul 14 11:22:06 2005
@@ -507,7 +507,7 @@ int __devinit pci_scan_bridge(struct pci
pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);

if (!is_cardbus) {
- child->bridge_ctl = PCI_BRIDGE_CTL_NO_ISA;
+ child->bridge_ctl = bctl | PCI_BRIDGE_CTL_NO_ISA;
/*
* Adjust subordinate busnr in parent buses.
* We do this before scanning for children because
--- 2.6.13-rc3/drivers/pci/setup-bus.c Thu Jul 14 11:09:52 2005
+++ linux/drivers/pci/setup-bus.c Thu Jul 14 11:22:54 2005
@@ -51,8 +51,6 @@ pbus_assign_resources_sorted(struct pci_
struct resource_list head, *list, *tmp;
int idx;

- bus->bridge_ctl &= ~PCI_BRIDGE_CTL_VGA;
-
head.next = NULL;
list_for_each_entry(dev, &bus->devices, bus_list) {
u16 class = dev->class >> 8;
@@ -62,10 +60,6 @@ pbus_assign_resources_sorted(struct pci_
class == PCI_CLASS_BRIDGE_HOST)
continue;

- if (class == PCI_CLASS_DISPLAY_VGA ||
- class == PCI_CLASS_NOT_DEFINED_VGA)
- bus->bridge_ctl |= PCI_BRIDGE_CTL_VGA;
-
pdev_sort_resources(dev, &head);
}

@@ -509,12 +503,6 @@ pci_bus_assign_resources(struct pci_bus

pbus_assign_resources_sorted(bus);

- if (bus->bridge_ctl & PCI_BRIDGE_CTL_VGA) {
- /* Propagate presence of the VGA to upstream bridges */
- for (b = bus; b->parent; b = b->parent) {
- b->bridge_ctl |= PCI_BRIDGE_CTL_VGA;
- }
- }
list_for_each_entry(dev, &bus->devices, bus_list) {
b = dev->subordinate;
if (!b)
-
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