diff options
Diffstat (limited to 'DuetPkg')
| -rw-r--r-- | DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c | 45 |
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;
}
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