1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 80c0868d0480..28a691cc625e 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -90,6 +90,18 @@ void __init acpi_old_suspend_ordering(void)
         old_suspend_ordering = true;
 }
 
+/*
+ * According to the ACPI specification the BIOS should make sure that ACPI is
+ * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
+ * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
+ * on such systems during resume.  Unfortunately that doesn't help in
+ * particularly pathological cases in which SCI_EN has to be set directly on
+ * resume, although the specification states very clearly that this flag is
+ * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
+ * cases.
+ */
+static bool set_sci_en_on_resume;
+
 /**
  *      acpi_pm_disable_gpes - Disable the GPEs.
  */
@@ -235,7 +247,11 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
         }
 
         /* If ACPI is not enabled by the BIOS, we need to enable it here. */
-        acpi_enable();
+        if (set_sci_en_on_resume)
+                acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
+        else
+                acpi_enable();
+
         /* Reprogram control registers and execute _BFS */
         acpi_leave_sleep_state_prep(acpi_state);
 
@@ -323,6 +339,12 @@ static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
         return 0;
 }
 
+static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
+{
+        set_sci_en_on_resume = true;
+        return 0;
+}
+
 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
         {
         .callback = init_old_suspend_ordering,
@@ -340,6 +362,22 @@ static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
                 },
         },
+        {
+        .callback = init_set_sci_en_on_resume,
+        .ident = "Apple MacBook 1,1",
+        .matches = {
+                DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
+                DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
+                },
+        },
+        {
+        .callback = init_set_sci_en_on_resume,
+        .ident = "Apple MacMini 1,1",
+        .matches = {
+                DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
+                DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
+                },
+        },
         {},
 };
 #endif /* CONFIG_SUSPEND */