add 3D controller support to vgaarb

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 111d956..bd9a01f 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -507,9 +507,11 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
    struct pci_bus *bus;
    struct pci_dev *bridge;
    u16 cmd;
+   int pci_class = pdev->class >> 8;

    /* Only deal with VGA class devices */
-   if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+   if (pci_class != PCI_CLASS_DISPLAY_VGA &&
+       pci_class != PCI_CLASS_DISPLAY_3D)
        return false;

    /* Allocate structure */