src/soc/amd/common/acpi/pci_root.asl

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #define ROOT_BRIDGE(acpi_name) \
   4         Device(acpi_name) { \
   5                 Name(_HID, EISAID("PNP0A08"))   /* PCI Express Root Bridge */ \
   6                 Name(_CID, EISAID("PNP0A03"))   /* PCI Root Bridge */ \
   7                 Method (_OSC, 4, NotSerialized) { \
   8                         /* Check for proper PCI/PCIe UUID */ \
   9                         If (Arg0 == ToUUID("33DB4D5B-1FF7-401C-9657-7441C03DD766")) \
  10                         { \
  11                                 /* Let OS control everything */ \
  12                                 Return(Arg3) \
  13                         } Else { \
  14                                 CreateDWordField(Arg3, 0, CDW1) \
  15                                 CDW1 = CDW1 | 4 /* Unrecognized UUID, so set bit 2 to 1 */ \
  16                                 Return(Arg3) \
  17                         } \
  18                 } \
  19         }