diff options
| author | Lv Zheng <lv.zheng@intel.com> | 2013-06-08 00:59:18 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-06-16 00:56:22 +0200 |
| commit | 7cec7048fe22e3e92389da2cd67098f6c4284e7f (patch) | |
| tree | 69ace1151d4870173b6bf35dce23a9d3bd608f11 /drivers/acpi/acpica | |
| parent | 42f47869c6a73a6893c998725365b587b0311f9a (diff) | |
ACPICA: Do not use extended sleep registers unless HW-reduced bit is set
Previous implementation incorrectly used the ACPI 5.0 extended
sleep registers if they were simply populated. This caused
problems on some non-HW-reduced machines. As per the ACPI spec,
they should only be used if the HW-reduced bit is set. Lv Zheng,
ACPICA BZ 1020.
References: https://bugzilla.kernel.org/show_bug.cgi?id=54181
References: https://bugs.acpica.org/show_bug.cgi?id=1020
Reported-by: Daniel Rowe <bart@fathom13.com>
Bisected-by: Brint E. Kriebel <kernel@bekit.net>
Cc: 3.4+ <stable@vger.kernel.org>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpica')
| -rw-r--r-- | drivers/acpi/acpica/hwxfsleep.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/hwxfsleep.c b/drivers/acpi/acpica/hwxfsleep.c index 111849c2117..f2e669db8b6 100644 --- a/drivers/acpi/acpica/hwxfsleep.c +++ b/drivers/acpi/acpica/hwxfsleep.c @@ -240,12 +240,14 @@ static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id) &acpi_sleep_dispatch[function_id]; #if (!ACPI_REDUCED_HARDWARE) - /* * If the Hardware Reduced flag is set (from the FADT), we must - * use the extended sleep registers + * use the extended sleep registers (FADT). Note: As per the ACPI + * specification, these extended registers are to be used for HW-reduced + * platforms only. They are not general-purpose replacements for the + * legacy PM register sleep support. */ - if (acpi_gbl_reduced_hardware || acpi_gbl_FADT.sleep_control.address) { + if (acpi_gbl_reduced_hardware) { status = sleep_functions->extended_function(sleep_state); } else { /* Legacy sleep */ |