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authorrsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>2012-04-12 01:49:27 +0000
committerrsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>2012-04-12 01:49:27 +0000
commit7e242786b7f9200f505514218642622f8bde01fb (patch)
treebde71e0f4a88e6044ce0855e81b532628fa485c1 /DuetPkg
parentafa9cd2541b92b0cdcc9c103045c942c2b1731b3 (diff)
downloadedk2-7e242786b7f9200f505514218642622f8bde01fb.tar.gz
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MdeModulePkg PciBusDxe and DuetPkg PciBusNoEnumerationDxe: Update ResetPowerManagementFeature() to clear 4 related R/W bits in the PMCSR register, leaving other bits preserved.
Signed-off-by: Sun Rui <rui.sun@intel.com> Reviewed-by: Fan Jeff <jeff.fan@intel.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13189 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'DuetPkg')
-rw-r--r--DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c45
1 files changed, 32 insertions, 13 deletions
diff --git a/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c b/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c
index 2d9b87ab09..eaeaeb762d 100644
--- a/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c
+++ b/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c
@@ -1,6 +1,6 @@
/*++
-Copyright (c) 2005 - 2006, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2005 - 2012, 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
@@ -46,7 +46,7 @@ Returns:
{
EFI_STATUS Status;
UINT8 PowerManagementRegBlock;
- UINT16 PMCSR;
+ UINT16 PowerManagementCSR;
PowerManagementRegBlock = 0;
@@ -64,18 +64,37 @@ Returns:
//
// Turn off the PWE assertion and put the device into D0 State
//
- PMCSR = 0x8000;
//
- // Write PMCSR
+ // Read PMCSR
//
- PciIoDevice->PciIo.Pci.Write (
- &PciIoDevice->PciIo,
- EfiPciIoWidthUint16,
- PowerManagementRegBlock + 4,
- 1,
- &PMCSR
- );
-
- return EFI_SUCCESS;
+ Status = PciIoDevice->PciIo.Pci.Read (
+ &PciIoDevice->PciIo,
+ EfiPciIoWidthUint16,
+ PowerManagementRegBlock + 4,
+ 1,
+ &PowerManagementCSR
+ );
+ if (!EFI_ERROR (Status)) {
+ //
+ // Clear PME_Status bit
+ //
+ PowerManagementCSR |= BIT15;
+ //
+ // Clear PME_En bit. PowerState = D0.
+ //
+ PowerManagementCSR &= ~(BIT8 | BIT1 | BIT0);
+
+ //
+ // Write PMCSR
+ //
+ Status = PciIoDevice->PciIo.Pci.Write (
+ &PciIoDevice->PciIo,
+ EfiPciIoWidthUint16,
+ PowerManagementRegBlock + 4,
+ 1,
+ &PowerManagementCSR
+ );
+ }
+ return Status;
}