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| author | Zhang Rui <rui.zhang@intel.com> | 2012-11-27 23:42:11 +0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2012-11-27 23:42:11 +0400 |
| commit | 261cba2deb7d3bebd180c35d5dbf8961f6e9afc4 (patch) | |
| tree | 60a9d395401edc63011f7c1ce7f1ddedb04895df /drivers/acpi/thermal.c | |
| parent | 05bce79e6d24ee6eb2beddf0f6314358404d472f (diff) | |
| download | linux-261cba2deb7d3bebd180c35d5dbf8961f6e9afc4.tar.xz | |
ACPI / thermal: _TMP and _CRT/_HOT/_PSV/_ACx dependency fix
On some platforms, _TMP and _CRT/_HOT/_PSV/_ACx have dependency.
And there is no way for OS to detect this dependency.
commit 9bcb8118965ab4631a65ee0726e6518f75cda6c5 shows us a problem
that _TMP must be evaluate after _CRT/_HOT/_PSV/_ACx, or else
firmware will shutdown the system.
But the machine in https://bugzilla.kernel.org/show_bug.cgi?id=43284
shows us that _PSV would return valid value only if _TMP has been
evaluated once.
With this patch, all of the control methods will be evaluated once,
in the _CRT/_HOT/_PSV/_CRT/_TMP order, before they are actually used.
[rjw: Added a local variable for the handle and modified the loop
slightly.]
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: katabami <katabami@lavabit.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/thermal.c')
| -rw-r--r-- | drivers/acpi/thermal.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index 804204d41999..6e8cc16b54c1 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -984,6 +984,38 @@ static void acpi_thermal_notify(struct acpi_device *device, u32 event) } } +/* + * On some platforms, the AML code has dependency about + * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx. + * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after + * /_CRT/_HOT/_PSV/_ACx, or else system will be power off. + * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0 + * if _TMP has never been evaluated. + * + * As this dependency is totally transparent to OS, evaluate + * all of them once, in the order of _CRT/_HOT/_PSV/_ACx, + * _TMP, before they are actually used. + */ +static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz) +{ + acpi_handle handle = tz->device->handle; + unsigned long long value; + int i; + + acpi_evaluate_integer(handle, "_CRT", NULL, &value); + acpi_evaluate_integer(handle, "_HOT", NULL, &value); + acpi_evaluate_integer(handle, "_PSV", NULL, &value); + for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) { + char name[5] = { '_', 'A', 'C', ('0' + i), '\0' }; + acpi_status status; + + status = acpi_evaluate_integer(handle, name, NULL, &value); + if (status == AE_NOT_FOUND) + break; + } + acpi_evaluate_integer(handle, "_TMP", NULL, &value); +} + static int acpi_thermal_get_info(struct acpi_thermal *tz) { int result = 0; @@ -992,6 +1024,8 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz) if (!tz) return -EINVAL; + acpi_thermal_aml_dependency_fix(tz); + /* Get trip points [_CRT, _PSV, etc.] (required) */ result = acpi_thermal_get_trip_points(tz); if (result) |