/**
* omap_panic_zone() - Force CPU frequency to a "safe frequency"
* . Force the CPU frequency to a “safe” frequency
* . Limit max CPU frequency to the “safe” frequency
*
* @cooling_list: The list of cooling devices available to cool the zone
* @cpu_temp: The current adjusted CPU temperature
*
* Returns 0 on success and -ENODEV for no cooling devices available to cool
*/
static int omap_panic_zone(struct list_head *cooling_list, int cpu_temp)
{
struct thermal_dev *cooling_dev, *tmp;
int die_temp_upper = 0;
int die_temp_lower = 0;
pr_info("%s:hot spot temp %d\n", __func__, cpu_temp);
/* TO DO: need to build an algo to find the right cooling agent */
list_for_each_entry_safe(cooling_dev, tmp, cooling_list, node) {
if (cooling_dev->dev_ops &&
cooling_dev->dev_ops->cool_device) {
/* TO DO: Add cooling agents to a list here */
list_add(&cooling_dev->node, &cooling_agents);
goto out;
} else {
pr_info("%s:Cannot find cool_device for %s\n",
__func__, cooling_dev->name);
}
}
out:
if (list_empty(&cooling_agents)) {
pr_err("%s: No Cooling devices registered\n",
__func__);
return -ENODEV;
} else {
omap_gov->cooling_level++;
omap_gov->panic_zone_reached++;
pr_info("%s: Panic zone reached %i times\n",
__func__, omap_gov->panic_zone_reached);
thermal_cooling_set_level(&cooling_agents,
omap_gov->cooling_level);
list_del_init(&cooling_agents);
die_temp_lower = hotspot_temp_to_sensor_temp(
OMAP_PANIC_TEMP - HYSTERESIS_VALUE);
/* Set the threshold window to below fatal. This way the
* governor can manage the thermal if the temp should rise
* while throttling. We need to be agressive with throttling
* should we reach this zone. */
die_temp_upper = (((OMAP_FATAL_TEMP - OMAP_PANIC_TEMP) / 4) *
omap_gov->panic_zone_reached ) + OMAP_PANIC_TEMP;
if (die_temp_upper >= OMAP_FATAL_TEMP)
die_temp_upper = OMAP_FATAL_TEMP;
die_temp_upper = hotspot_temp_to_sensor_temp(die_temp_upper);
thermal_update_temp_thresholds(omap_gov->temp_sensor,
die_temp_lower, die_temp_upper);
omap_update_report_rate(omap_gov->temp_sensor,
FAST_TEMP_MONITORING_RATE);
}
return 0;
}
/**
* omap_alert_zone() - "Alert Zone" definition:
* - If the Panic Zone has never been reached, then
* - Define constraint about Max CPU frequency
* if Current frequency < Max frequency,
* then Max frequency = Current frequency
* - Else keep the constraints set previously until
* temperature falls to safe zone
*
* @cooling_list: The list of cooling devices available to cool the zone
* @cpu_temp: The current adjusted CPU temperature
*
* Returns 0 on success and -ENODEV for no cooling devices available to cool
*/
static int omap_alert_zone(struct list_head *cooling_list, int cpu_temp)
{
struct thermal_dev *cooling_dev, *tmp;
int die_temp_upper = 0;
int die_temp_lower = 0;
pr_info("%s:hot spot temp %d\n", __func__, cpu_temp);
/* TO DO: need to build an algo to find the right cooling agent */
list_for_each_entry_safe(cooling_dev, tmp, cooling_list, node) {
if (cooling_dev->dev_ops &&
cooling_dev->dev_ops->cool_device) {
/* TO DO: Add cooling agents to a list here */
list_add(&cooling_dev->node, &cooling_agents);
goto out;
} else {
pr_info("%s:Cannot find cool_device for %s\n",
__func__, cooling_dev->name);
}
}
out:
if (list_empty(&cooling_agents)) {
pr_err("%s: No Cooling devices registered\n",
__func__);
return -ENODEV;
} else {
if (omap_gov->panic_zone_reached == 0) {
/* Temperature rises and enters into alert zone */
omap_gov->cooling_level = 0;
thermal_cooling_set_level(&cooling_agents,
omap_gov->cooling_level);
}
list_del_init(&cooling_agents);
omap_gov->hotspot_temp_lower =
(OMAP_ALERT_TEMP - HYSTERESIS_VALUE);
omap_gov->hotspot_temp_upper = OMAP_PANIC_TEMP;
die_temp_lower = hotspot_temp_to_sensor_temp(
omap_gov->hotspot_temp_lower);
die_temp_upper = hotspot_temp_to_sensor_temp(
omap_gov->hotspot_temp_upper);
thermal_update_temp_thresholds(omap_gov->temp_sensor,
die_temp_lower, die_temp_upper);
omap_update_report_rate(omap_gov->temp_sensor,
FAST_TEMP_MONITORING_RATE);
if (pcb_sensor)
omap_gov->average_period = FAST_TEMP_MONITORING_RATE;
}
return 0;
}
