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

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This reverts commit 5db417ed25.
 "MdeModulePkg/PciBusDxe: Enable Bus Master on P2P bridges on demand"

We met some compatibility issues when doing Windows S4 resume.
Reverting the BME disabling patches to fix the S4 resume issue.

Signed-off-by: Ruiyu Ni <Ruiyu.ni@intel.com>
Signed-off-by: Michael Turner <michael.turner@microsoft.com>
Cc: Michael D Kinney <Michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Ruiyu Ni
2017-11-20 11:03:41 +08:00
parent 8315563285
commit a8035b9086
3 changed files with 10 additions and 32 deletions
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16
MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c
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@@ -1,7 +1,7 @@
/** @file
Supporting functions implementaion for PCI devices management.
Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
@@ -711,12 +711,7 @@ StartPciDevicesOnBridge (
0,
&Supports
);
//
// By default every bridge's IO and MMIO spaces are enabled.
// Bridge's Bus Master will be enabled when any device behind it requests
// to enable Bus Master.
//
Supports &= (UINT64) (EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY);
Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;
PciIoDevice->PciIo.Attributes (
&(PciIoDevice->PciIo),
EfiPciIoAttributeOperationEnable,
@@ -768,12 +763,7 @@ StartPciDevicesOnBridge (
0,
&Supports
);
//
// By default every bridge's IO and MMIO spaces are enabled.
// Bridge's Bus Master will be enabled when any device behind it requests
// to enable Bus Master.
//
Supports &= (UINT64) (EFI_PCI_IO_ATTRIBUTE_IO | EFI_PCI_IO_ATTRIBUTE_MEMORY);
Supports &= (UINT64)EFI_PCI_DEVICE_ENABLE;
PciIoDevice->PciIo.Attributes (
&(PciIoDevice->PciIo),
EfiPciIoAttributeOperationEnable,