diff options
| author | Len Brown <len.brown@intel.com> | 2007-08-14 21:49:32 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-08-14 21:49:32 +0200 |
| commit | c52a7419af18594426bc601d1ea346dbbcf71e28 (patch) | |
| tree | b964b0de460e3508e092efa3b69fbc7267aef735 /drivers/acpi | |
| parent | ACPI: thermal: clean up MODULE_PARM_DESC newlines (diff) | |
| download | linux-c52a7419af18594426bc601d1ea346dbbcf71e28.tar.xz linux-c52a7419af18594426bc601d1ea346dbbcf71e28.zip | |
ACPI: thermal: create "thermal.crt=C" bootparam
Some hardware will malfunction at a temperature below
the BIOS provided critical shutdown threshold.
This hook allows moving the critical trip points down
to a temperature which provokes a graceful shutdown
before the hardware malfunction.
http://bugzilla.kernel.org/show_bug.cgi?id=8884
WARNING: A trip-point override will not get noticed
until the system delivers a temperature change event,
or unless thermal zone polling is enabled.
eg. "thermal.tzp=10"
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/thermal.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c index 9b31f36481d2..4c420feba207 100644 --- a/drivers/acpi/thermal.c +++ b/drivers/acpi/thermal.c @@ -79,6 +79,10 @@ static int act; module_param(act, int, 0644); MODULE_PARM_DESC(act, "Disable or override all lowest active trip points."); +static int crt; +module_param(crt, int, 0644); +MODULE_PARM_DESC(crt, "Disable or lower all critical trip points."); + static int tzp; module_param(tzp, int, 0444); MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds."); @@ -340,6 +344,20 @@ static int acpi_thermal_get_trip_points(struct acpi_thermal *tz) tz->trips.critical.temperature)); } + if (tz->trips.critical.flags.valid == 1) { + if (crt == -1) { + tz->trips.critical.flags.valid = 0; + } else if (crt > 0) { + unsigned long crt_k = CELSIUS_TO_KELVIN(crt); + + /* + * Allow override to lower critical threshold + */ + if (crt_k < tz->trips.critical.temperature) + tz->trips.critical.temperature = crt_k; + } + } + /* Critical Sleep (optional) */ status = |