X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=DuetPkg%2FPciBusNoEnumerationDxe%2FPciPowerManagement.c;h=eaeaeb762dcac28ee5cb10cee1ea77e3c1722ef3;hb=5a39f404f3b870fd27d0127b864d82c90704fde6;hp=20bd4a7428e4b30901b3650e083be14ec19a8763;hpb=d8bee43ce44db3012de2274b135ede6d06106f7d;p=mirror_edk2.git

diff --git a/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c b/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c
index 20bd4a7428..eaeaeb762d 100644
--- a/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c
+++ b/DuetPkg/PciBusNoEnumerationDxe/PciPowerManagement.c
@@ -1,7 +1,7 @@
 /*++
 
-Copyright (c) 2005 - 2006, Intel Corporation                                                         
-All rights reserved. This program and the accompanying materials                          
+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        
 http://opensource.org/licenses/bsd-license.php                                            
@@ -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;
 }