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

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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 Linux 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>
This commit is contained in:
Bob Moore
2013-08-08 15:29:51 +08:00
committed by Rafael J. Wysocki
parent 2641f54080
commit 1d82980c99
2 changed files with 14 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/acpi/acpica/hwtimer.c
+12 -1
View File
@@ -100,8 +100,13 @@ acpi_status acpi_get_timer(u32 * ticks)
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_hw_read(ticks, &acpi_gbl_FADT.xpm_timer_block);
/* ACPI 5.0A: PM Timer is optional */
if (!acpi_gbl_FADT.xpm_timer_block.address) {
return_ACPI_STATUS(AE_SUPPORT);
}
status = acpi_hw_read(ticks, &acpi_gbl_FADT.xpm_timer_block);
return_ACPI_STATUS(status);
}
@@ -148,6 +153,12 @@ acpi_get_timer_duration(u32 start_ticks, u32 end_ticks, u32 * time_elapsed)
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* ACPI 5.0A: PM Timer is optional */
if (!acpi_gbl_FADT.xpm_timer_block.address) {
return_ACPI_STATUS(AE_SUPPORT);
}
/*
* Compute Tick Delta:
* Handle (max one) timer rollovers on 24-bit versus 32-bit timers.