[PATCH] PCI: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index df3bdae..93e8a87 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -507,7 +507,7 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
                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

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 9fe48f7..a2eebc6 100644 (file)
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -51,8 +51,6 @@ pbus_assign_resources_sorted(struct pci_bus *bus)
        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_bus *bus)
                    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 *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)