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authorLin Ming <ming.m.lin@intel.com>2012-03-21 10:01:49 +0800
committerLen Brown <len.brown@intel.com>2012-03-26 21:16:25 -0400
commit8a73b17e4c0e09cb5b80deee5451e29b830df4cc (patch)
tree292f555ca2aa42b4b4d756aca01a53b65df60970 /drivers/acpi/acpica/hwesleep.c
parent4acb6884b5568f19bd47173cba8bc1f2289d6baa (diff)
downloadop-kernel-dev-8a73b17e4c0e09cb5b80deee5451e29b830df4cc.zip
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ACPICA: Sleep/Wake interfaces: optionally execute _GTS and _BFS
Enhanced the sleep/wake interfaces to optionally execute the _GTS method (Going To Sleep), and the _BFS method (Back From Sleep). Windows apparently does not execute these methods, and therefore these methods are often untested. It has been seen on some systems where the execution of these methods causes errors and also prevents the machine from entering S5. It is therefore suggested that host operating systems do not execute these methods by default. In the future, perhaps these methods can be optionally executed based on the age of the system and/or what is the newest version of Windows that the BIOS asks for via _OSI. Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/hwesleep.c')
-rw-r--r--drivers/acpi/acpica/hwesleep.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/acpi/acpica/hwesleep.c b/drivers/acpi/acpica/hwesleep.c
index 6cbc4e1..1c409e8 100644
--- a/drivers/acpi/acpica/hwesleep.c
+++ b/drivers/acpi/acpica/hwesleep.c
@@ -103,6 +103,7 @@ void acpi_hw_execute_sleep_method(char *method_pathname, u32 integer_argument)
* FUNCTION: acpi_hw_extended_sleep
*
* PARAMETERS: sleep_state - Which sleep state to enter
+ * Flags - ACPI_EXECUTE_GTS to run optional method
*
* RETURN: Status
*
@@ -112,7 +113,7 @@ void acpi_hw_execute_sleep_method(char *method_pathname, u32 integer_argument)
*
******************************************************************************/
-acpi_status acpi_hw_extended_sleep(u8 sleep_state)
+acpi_status acpi_hw_extended_sleep(u8 sleep_state, u8 flags)
{
acpi_status status;
u8 sleep_type_value;
@@ -136,9 +137,11 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
acpi_gbl_system_awake_and_running = FALSE;
- /* Execute the _GTS method (Going To Sleep) */
+ /* Optionally execute _GTS (Going To Sleep) */
- acpi_hw_execute_sleep_method(METHOD_PATHNAME__GTS, sleep_state);
+ if (flags & ACPI_EXECUTE_GTS) {
+ acpi_hw_execute_sleep_method(METHOD_PATHNAME__GTS, sleep_state);
+ }
/* Flush caches, as per ACPI specification */
@@ -181,6 +184,7 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
* FUNCTION: acpi_hw_extended_wake_prep
*
* PARAMETERS: sleep_state - Which sleep state we just exited
+ * Flags - ACPI_EXECUTE_BFS to run optional method
*
* RETURN: Status
*
@@ -189,7 +193,7 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
*
******************************************************************************/
-acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
+acpi_status acpi_hw_extended_wake_prep(u8 sleep_state, u8 flags)
{
acpi_status status;
u8 sleep_type_value;
@@ -208,7 +212,11 @@ acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
&acpi_gbl_FADT.sleep_control);
}
- acpi_hw_execute_sleep_method(METHOD_PATHNAME__BFS, sleep_state);
+ /* Optionally execute _BFS (Back From Sleep) */
+
+ if (flags & ACPI_EXECUTE_BFS) {
+ acpi_hw_execute_sleep_method(METHOD_PATHNAME__BFS, sleep_state);
+ }
return_ACPI_STATUS(AE_OK);
}
@@ -217,6 +225,7 @@ acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
* FUNCTION: acpi_hw_extended_wake
*
* PARAMETERS: sleep_state - Which sleep state we just exited
+ * Flags - Reserved, set to zero
*
* RETURN: Status
*
@@ -225,7 +234,7 @@ acpi_status acpi_hw_extended_wake_prep(u8 sleep_state)
*
******************************************************************************/
-acpi_status acpi_hw_extended_wake(u8 sleep_state)
+acpi_status acpi_hw_extended_wake(u8 sleep_state, u8 flags)
{
ACPI_FUNCTION_TRACE(hw_extended_wake);
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