Re: [patch 2.6] remove PCI_BRIDGE_CTL_VGA handling from setup-bus.c

[Jon Smirl]

On 7/14/05, Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx> wrote:
> It shouldn't be a problem. These days we have a lot of arch hooks
> in the PCI layer. I'd probably start with the following:

You need to take this code into account, from arch/i386/pci/fixup.c

/*
 * Fixup to mark boot BIOS video selected by BIOS before it changes
 *
 * From information provided by "Jon Smirl" <jonsmirl@xxxxxxxxx>
 *
 * The standard boot ROM sequence for an x86 machine uses the BIOS
 * to select an initial video card for boot display. This boot video
 * card will have it's BIOS copied to C0000 in system RAM.
 * IORESOURCE_ROM_SHADOW is used to associate the boot video
 * card with this copy. On laptops this copy has to be used since
 * the main ROM may be compressed or combined with another image.
 * See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW
 * is marked here since the boot video device will be the only enabled
 * video device at this point.
 */

static void __devinit pci_fixup_video(struct pci_dev *pdev)
{
        struct pci_dev *bridge;
        struct pci_bus *bus;
        u16 config;

        if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
                return;

        /* Is VGA routed to us? */
        bus = pdev->bus;
        while (bus) {
                bridge = bus->self;
                if (bridge) {
                        pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
                                                &config);
                        if (!(config & PCI_BRIDGE_CTL_VGA))
                                return;
                }
                bus = bus->parent;
        }
        pci_read_config_word(pdev, PCI_COMMAND, &config);
        if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
                pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
                printk(KERN_DEBUG "Boot video device is %s\n", pci_name(pdev));
        }
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);

-- 
Jon Smirl
jonsmirl@xxxxxxxxx
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