ACPICA: Make ACPI Power Management Timer (PM Timer) optional.

PM Timer is now optional.
This support is already in Windows8 and "SHOULD" come out in ACPI 5.0A
(if all goes well).

The change doesn't affect Xen directly, because it does not rely
on the presence of the PM timer.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[ported to Xen]
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>

diff --git a/xen/drivers/acpi/tables/tbfadt.c b/xen/drivers/acpi/tables/tbfadt.c
index d62d8d5cb9269c8a53146d4aeff9f91a0bc42d4a..f11fd5a900268f98e59b165432199cb40e2c24bc 100644 (file)
--- a/xen/drivers/acpi/tables/tbfadt.c
+++ b/xen/drivers/acpi/tables/tbfadt.c
@@ -95,7 +95,8 @@ static struct acpi_fadt_info __initdata fadt_info_table[] = {
 
        {"PmTimerBlock", ACPI_FADT_OFFSET(xpm_timer_block),
         ACPI_FADT_OFFSET(pm_timer_block),
-        ACPI_FADT_OFFSET(pm_timer_length), ACPI_FADT_REQUIRED},
+        ACPI_FADT_OFFSET(pm_timer_length),
+        ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
 
        {"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block),
         ACPI_FADT_OFFSET(gpe0_block),
@@ -437,7 +438,7 @@ static void __init acpi_tb_validate_fadt(void)
 
                if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
                        /*
-                        * Field is required (Pm1a_event, Pm1a_control, pm_timer).
+                        * Field is required (Pm1a_event, Pm1a_control).
                         * Both the address and length must be non-zero.
                         */
                        if (!address64->address || !length) {