[Xen-devel] [PATCH] Enable C3 without bm control only for CST based C3

["Yu, Ke" <ke.yu@xxxxxxxxx>]

domain0 patch: pull from Linux kernel upstream, to get correct C3 info in 
certain newer machine.

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>

diff -r a070228ac76e -r 5e8ad099d5c8 drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -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 {
                /*

Attachment: c3-bm-control-dom0.patch
Description: c3-bm-control-dom0.patch

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