From 7e242786b7f9200f505514218642622f8bde01fb Mon Sep 17 00:00:00 2001
From: rsun3 <rsun3@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 12 Apr 2012 01:49:27 +0000
Subject: 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
---
 .../PciBusNoEnumerationDxe/PciPowerManagement.c    | 45 +++++++++++++++-------
 1 file changed, 32 insertions(+), 13 deletions(-)

(limited to 'DuetPkg/PciBusNoEnumerationDxe')

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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