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ACPI: thermal: use round_jiffies when thermal zone polling is enabled 

Properly functioning systems do not use thermal zone polling,
they use event-based notification.

However, some users enable periodic thermal zone polling
to work around bugs on their platforms, and at least one
platform exists with a real _TZP that requests polling.

While thermal zone polling (_TZP) is specified in units to 0.1 seconds,
it actually has a maximum granularity of 1 second.  Thus, we can safely
round up the _TZP timeout to occur on the next 1-second boundary.
This will batch it with other 1-second-granularity timers in the
system and thus potentially extend processor idle duration.

Note that the same timer is used both for _TZP
and for passive processor thermal throttling.
We can not round up the timeout when it is used
for passive thermal throttling.

Also, we can not make this a deferrable timer,
as temperature is just as relevant during idle
as it is during non-idle.

Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2007-09-04 12:49:22 -04:00
parent 40ffbfad6b
commit 21bc42ab85
1 changed files with 8 additions and 5 deletions
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13
drivers/acpi/thermal.c
View File

@ -711,6 +711,7 @@ static void acpi_thermal_check(void *data)
int result = 0;
struct acpi_thermal *tz = data;
unsigned long sleep_time = 0;
unsigned long timeout_jiffies = 0;
int i = 0;
struct acpi_thermal_state state;
@ -787,10 +788,13 @@ static void acpi_thermal_check(void *data)
* a thermal event occurs). Note that _TSP and _TZD values are
* given in 1/10th seconds (we must covert to milliseconds).
*/
if (tz->state.passive)
if (tz->state.passive) {
sleep_time = tz->trips.passive.tsp * 100;
else if (tz->polling_frequency > 0)
timeout_jiffies = jiffies + (HZ * sleep_time) / 1000;
} else if (tz->polling_frequency > 0) {
sleep_time = tz->polling_frequency * 100;
timeout_jiffies = round_jiffies(jiffies + (HZ * sleep_time) / 1000);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
tz->name, tz->temperature, sleep_time));
@ -804,12 +808,11 @@ static void acpi_thermal_check(void *data)
del_timer(&(tz->timer));
} else {
if (timer_pending(&(tz->timer)))
mod_timer(&(tz->timer),
jiffies + (HZ * sleep_time) / 1000);
mod_timer(&(tz->timer), timeout_jiffies);
else {
tz->timer.data = (unsigned long)tz;
tz->timer.function = acpi_thermal_run;
tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
tz->timer.expires = timeout_jiffies;
add_timer(&(tz->timer));
}
}