[Xen-changelog] [linux-2.6.18-xen] dom0: Enable C3 without bm control only for CST based C3

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1229184043 0
# Node ID ff9683032b76f533509191bb9532df10cbb9830b
# Parent  a070228ac76e3f6cd2483e0cad03f1cccae7a0c8
dom0: Enable C3 without bm control only for CST based C3

commit ed3110efb538d7acbf635095c1382118f7414f75
Author: Venki Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Date:   Tue Jul 31 12:04:31 2007 -0700

    ACPI: fix "Time Problems with 2.6.23-rc1-gf695baf2"

    Enable C3 without bm control only for CST based C3.

    Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
 drivers/acpi/processor_idle.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff -r a070228ac76e -r ff9683032b76 drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c     Thu Dec 11 13:38:48 2008 +0000
+++ b/drivers/acpi/processor_idle.c     Sat Dec 13 16:00:43 2008 +0000
@@ -857,11 +857,17 @@ static void acpi_processor_power_verify_
        }
 
        if (pr->flags.bm_check) {
-               /* bus mastering control is necessary */
                if (!pr->flags.bm_control) {
-                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                         "C3 support requires bus mastering 
control\n"));
-                       return;
+                       if (pr->flags.has_cst != 1) {
+                               /* bus mastering control is necessary */
+                               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "C3 support requires BM control\n"));
+                               return;
+                       } else {
+                               /* Here we enter C3 without bus mastering */
+                               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "C3 support without BM control\n"));
+                       }
                }
        } else {
                /*

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