blob: fc505d58f078ecfb55210cd3e802ed23c4b41a8e [file] [log] [blame]
* Exceptions for specific devices. Usually work-arounds for fatal design flaws.
* Derived from fixup.c of i386 tree.
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/vgaarb.h>
#include <linux/screen_info.h>
#include <asm/machvec.h>
* Fixup to mark boot BIOS video selected by BIOS before it changes
* From information provided by "Jon Smirl" <>
* 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. Before marking the device
* with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set
* by either arch cde or vga-arbitration, if so only apply the fixup to this
* already determined primary video card.
static void pci_fixup_video(struct pci_dev *pdev)
struct pci_dev *bridge;
struct pci_bus *bus;
u16 config;
if ((strcmp(ia64_platform_name, "dig") != 0)
&& (strcmp(ia64_platform_name, "hpzx1") != 0))
/* Maybe, this machine supports legacy memory map. */
/* Is VGA routed to us? */
bus = pdev->bus;
while (bus) {
bridge = bus->self;
* From information provided by
* "David Miller" <>
* The bridge control register is valid for PCI header
* type BRIDGE, or CARDBUS. Host to PCI controllers use
* PCI header type NORMAL.
if (bridge && (pci_is_bridge(bridge))) {
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
if (!(config & PCI_BRIDGE_CTL_VGA))
bus = bus->parent;
if (!vga_default_device() || pdev == vga_default_device()) {
pci_read_config_word(pdev, PCI_COMMAND, &config);
dev_printk(KERN_DEBUG, &pdev->dev, "Video device with shadowed ROM\n");
PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);