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MdeModulePkg/PciBus: Do not enable MemWriteAndInvalidate bit for PCIE 

Per PCIE spec, Memory Write and Invalidate is hardwired to 0b so
PciBus driver shouldn't write 1b to it.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
This commit is contained in:
Ruiyu Ni 2018-05-25 17:57:37 +08:00
parent 2b5f0daa6c
commit d923365417
1 changed files with 6 additions and 4 deletions
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10
MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
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@ -1,7 +1,7 @@
/** @file
PCI emumeration support functions implementation for PCI Bus module.
Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@ -1254,9 +1254,11 @@ DetermineDeviceAttribute (
PciSetDeviceAttribute (PciIoDevice, OldCommand, OldBridgeControl, EFI_SET_ATTRIBUTES);
//
// Enable other supported attributes but not defined in PCI_IO_PROTOCOL
//
PCI_ENABLE_COMMAND_REGISTER (PciIoDevice, EFI_PCI_COMMAND_MEMORY_WRITE_AND_INVALIDATE);
// Enable other PCI supported attributes but not defined in PCI_IO_PROTOCOL
// For PCI Express devices, Memory Write and Invalidate is hardwired to 0b so only enable it for PCI devices.
if (!PciIoDevice->IsPciExp) {
PCI_ENABLE_COMMAND_REGISTER (PciIoDevice, EFI_PCI_COMMAND_MEMORY_WRITE_AND_INVALIDATE);
}
}
FastB2BSupport = TRUE;