1 files changed, 55 insertions, 0 deletions

diff --git a/arch/i386/pci/fixup.c b/arch/i386/pci/fixup.c
index 908b410f4c93..c1949ff38d61 100644
--- a/arch/i386/pci/fixup.c
+++ b/arch/i386/pci/fixup.c
@@ -343,6 +343,61 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC,	pcie_ro
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_DEVICE_ID_INTEL_MCH_PC1,    pcie_rootport_aspm_quirk );
 
 /*
+ * Fixup to mark boot BIOS video selected by BIOS before it changes
+ *
+ * From information provided by "Jon Smirl" <jonsmirl@gmail.com>
+ *
+ * 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;
+
+                /*
+                 * From information provided by
+                 * "David Miller" <davem@davemloft.net>
+                 * The bridge control register is valid for PCI header
+                 * type BRIDGE, or CARDBUS. Host to PCI controllers use
+                 * PCI header type NORMAL.
+                 */
+                if (bridge
+                    &&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+                       ||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
+                        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);
+
+/*
  * Some Toshiba laptops need extra code to enable their TI TSB43AB22/A.
  *
  * We pretend to bring them out of full D3 state, and restore the proper