MdeModulePkg/PciBus: Revert "Enable BM on P2P bridges on demand"

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciDeviceSupport.c

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
index 97bb971a5966a2d869d8da42b47cb4e5be386f27..e76c8f00468a87e9db7d6b014b3cffa257cd2a89 100644 (file)
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
@@ -1,7 +1,7 @@
 /** @file\r
   Supporting functions implementaion for PCI devices management.\r
 \r
-Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
@@ -711,12 +711,7 @@ StartPciDevicesOnBridge (
                              0,\r
                              &Supports\r
                              );\r
-        //\r
-        // By default every bridge's IO and MMIO spaces are enabled.\r
-        // Bridge's Bus Master will be enabled when any device behind it requests\r
-        // to enable Bus Master.\r
-        //\r
-        Supports &= (UINT64) (EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY);\r
+        Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;\r
         PciIoDevice->PciIo.Attributes (\r
                              &(PciIoDevice->PciIo),\r
                              EfiPciIoAttributeOperationEnable,\r
@@ -768,12 +763,7 @@ StartPciDevicesOnBridge (
                              0,\r
                              &Supports\r
                              );\r
-        //\r
-        // By default every bridge's IO and MMIO spaces are enabled.\r
-        // Bridge's Bus Master will be enabled when any device behind it requests\r
-        // to enable Bus Master.\r
-        //\r
-        Supports &= (UINT64) (EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY);\r
+        Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;\r
         PciIoDevice->PciIo.Attributes (\r
                              &(PciIoDevice->PciIo),\r
                              EfiPciIoAttributeOperationEnable,\r