static int
acpi_thermal_passive (
struct acpi_thermal *tz)
{
int result = 0;
struct acpi_thermal_passive *passive = NULL;
int trend = 0;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_thermal_passive");
if (!tz || !tz->trips.passive.flags.valid)
return_VALUE(-EINVAL);
passive = &(tz->trips.passive);
/*
* Above Trip?
* -----------
* Calculate the thermal trend (using the passive cooling equation)
* and modify the performance limit for all passive cooling devices
* accordingly. Note that we assume symmetry.
*/
if (tz->temperature >= passive->temperature) {
trend = (passive->tc1 * (tz->temperature - tz->last_temperature)) + (passive->tc2 * (tz->temperature - passive->temperature));
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
trend, passive->tc1, tz->temperature,
tz->last_temperature, passive->tc2,
tz->temperature, passive->temperature));
tz->trips.passive.flags.enabled = 1;
/* Heating up? */
if (trend > 0)
for (i=0; i<passive->devices.count; i++)
acpi_processor_set_thermal_limit(
passive->devices.handles[i],
ACPI_PROCESSOR_LIMIT_INCREMENT);
/* Cooling off? */
else if (trend < 0)
for (i=0; i<passive->devices.count; i++)
acpi_processor_set_thermal_limit(
passive->devices.handles[i],
ACPI_PROCESSOR_LIMIT_DECREMENT);
}
/*
* Below Trip?
* -----------
* Implement passive cooling hysteresis to slowly increase performance
* and avoid thrashing around the passive trip point. Note that we
* assume symmetry.
*/
else if (tz->trips.passive.flags.enabled) {
for (i=0; i<passive->devices.count; i++)
result = acpi_processor_set_thermal_limit(
passive->devices.handles[i],
ACPI_PROCESSOR_LIMIT_DECREMENT);
if (result == 1) {
tz->trips.passive.flags.enabled = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Disabling passive cooling (zone is cool)\n"));
}
}
return_VALUE(0);
}
static void
acpi_thermal_passive (
struct acpi_thermal *tz)
{
int result = 0;
struct acpi_thermal_passive *passive = NULL;
int trend = 0;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_thermal_passive");
if (!tz || !tz->trips.passive.flags.valid)
return;
passive = &(tz->trips.passive);
/*
* Above Trip?
* -----------
* Calculate the thermal trend (using the passive cooling equation)
* and modify the performance limit for all passive cooling devices
* accordingly. Note that we assume symmetry.
*/
if (tz->temperature >= passive->temperature) {
trend = (passive->tc1 * (tz->temperature - tz->last_temperature)) + (passive->tc2 * (tz->temperature - passive->temperature));
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
trend, passive->tc1, tz->temperature,
tz->last_temperature, passive->tc2,
tz->temperature, passive->temperature));
tz->trips.passive.flags.enabled = 1;
/* Heating up? */
if (trend > 0)
for (i=0; i<passive->devices.count; i++) {
printk( "Error: acpi_processor_set_thermal_limit() not implemented!\n" );
#if 0
acpi_processor_set_thermal_limit(
passive->devices.handles[i],
ACPI_PROCESSOR_LIMIT_INCREMENT);
#endif
}
/* Cooling off? */
else if (trend < 0) {
for (i=0; i<passive->devices.count; i++) {
printk( "Error: acpi_processor_set_thermal_limit() not implemented!\n" );
#if 0
acpi_processor_set_thermal_limit(
passive->devices.handles[i],
ACPI_PROCESSOR_LIMIT_DECREMENT);
#endif
}
/*
* Leave cooling mode, even if the temp might
* higher than trip point This is because some
* machines might have long thermal polling
* frequencies (tsp) defined. We will fall back
* into passive mode in next cycle (probably quicker)
*/
if (result) {
passive->flags.enabled = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Disabling passive cooling, still above threshold,"
" but we are cooling down\n"));
}
}
return;
}
/*
* Below Trip?
* -----------
* Implement passive cooling hysteresis to slowly increase performance
* and avoid thrashing around the passive trip point. Note that we
* assume symmetry.
*/
if (!passive->flags.enabled)
return;
for (i=0; i<passive->devices.count; i++) {
printk( "Error: acpi_processor_set_thermal_limit() not implemented!\n" );
#if 0
result = acpi_processor_set_thermal_limit(
passive->devices.handles[i],
ACPI_PROCESSOR_LIMIT_DECREMENT);
#endif
}
if (result) {
passive->flags.enabled = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Disabling passive cooling (zone is cool)\n"));
}
}
