2 * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
3 * Derived from fixup.c of i386 tree.
7 #include <linux/init.h>
8 #include <linux/vgaarb.h>
10 #include <asm/machvec.h>
13 * Fixup to mark boot BIOS video selected by BIOS before it changes
15 * From information provided by "Jon Smirl" <jonsmirl@gmail.com>
17 * The standard boot ROM sequence for an x86 machine uses the BIOS
18 * to select an initial video card for boot display. This boot video
19 * card will have it's BIOS copied to C0000 in system RAM.
20 * IORESOURCE_ROM_SHADOW is used to associate the boot video
21 * card with this copy. On laptops this copy has to be used since
22 * the main ROM may be compressed or combined with another image.
23 * See pci_map_rom() for use of this flag. Before marking the device
24 * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set
25 * by either arch cde or vga-arbitration, if so only apply the fixup to this
26 * already determined primary video card.
29 static void pci_fixup_video(struct pci_dev *pdev)
31 struct pci_dev *bridge;
35 if ((strcmp(ia64_platform_name, "dig") != 0)
36 && (strcmp(ia64_platform_name, "hpzx1") != 0))
38 /* Maybe, this machine supports legacy memory map. */
40 /* Is VGA routed to us? */
46 * From information provided by
47 * "David Miller" <davem@davemloft.net>
48 * The bridge control register is valid for PCI header
49 * type BRIDGE, or CARDBUS. Host to PCI controllers use
50 * PCI header type NORMAL.
53 &&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
54 ||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
55 pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
57 if (!(config & PCI_BRIDGE_CTL_VGA))
62 if (!vga_default_device() || pdev == vga_default_device()) {
63 pci_read_config_word(pdev, PCI_COMMAND, &config);
64 if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
65 pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
66 dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n");
67 vga_set_default_device(pdev);
71 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
72 PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);