mirror of https://github.com/acidanthera/audk.git
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
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@ -1,6 +1,6 @@
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/*++
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Copyright (c) 2005 - 2006, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2005 - 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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@ -46,7 +46,7 @@ Returns:
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{
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EFI_STATUS Status;
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UINT8 PowerManagementRegBlock;
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UINT16 PMCSR;
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UINT16 PowerManagementCSR;
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PowerManagementRegBlock = 0;
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@ -64,18 +64,37 @@ Returns:
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//
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// Turn off the PWE assertion and put the device into D0 State
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//
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PMCSR = 0x8000;
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//
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// Write PMCSR
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// Read PMCSR
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//
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PciIoDevice->PciIo.Pci.Write (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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PowerManagementRegBlock + 4,
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1,
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&PMCSR
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);
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Status = PciIoDevice->PciIo.Pci.Read (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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PowerManagementRegBlock + 4,
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1,
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&PowerManagementCSR
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);
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if (!EFI_ERROR (Status)) {
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//
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// Clear PME_Status bit
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//
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PowerManagementCSR |= BIT15;
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//
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// Clear PME_En bit. PowerState = D0.
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//
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PowerManagementCSR &= ~(BIT8 | BIT1 | BIT0);
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return EFI_SUCCESS;
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//
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// Write PMCSR
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//
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Status = PciIoDevice->PciIo.Pci.Write (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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PowerManagementRegBlock + 4,
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1,
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&PowerManagementCSR
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);
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}
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return Status;
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}
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@ -1,7 +1,7 @@
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/** @file
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Power management support fucntions implementation for PCI Bus module.
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Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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@ -50,19 +50,39 @@ ResetPowerManagementFeature (
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//
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// Turn off the PWE assertion and put the device into D0 State
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//
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PowerManagementCSR = 0x8000;
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//
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// Write PMCSR
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// Read PMCSR
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//
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PciIoDevice->PciIo.Pci.Write (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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PowerManagementRegBlock + 4,
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1,
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&PowerManagementCSR
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);
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Status = PciIoDevice->PciIo.Pci.Read (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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PowerManagementRegBlock + 4,
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1,
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&PowerManagementCSR
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);
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return EFI_SUCCESS;
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if (!EFI_ERROR (Status)) {
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//
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// Clear PME_Status bit
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//
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PowerManagementCSR |= BIT15;
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//
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// Clear PME_En bit. PowerState = D0.
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//
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PowerManagementCSR &= ~(BIT8 | BIT1 | BIT0);
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//
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// Write PMCSR
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//
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Status = PciIoDevice->PciIo.Pci.Write (
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&PciIoDevice->PciIo,
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EfiPciIoWidthUint16,
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PowerManagementRegBlock + 4,
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1,
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&PowerManagementCSR
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);
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}
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return Status;
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}
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