On Thu, Jul 26, 2012 at 04:41:16PM +0800, Zhang Rui wrote:
> This function is used to update the cooling state of
> all the cooling devices that are bound to an active trip point.
>
> This will be used for passive cooling as well, in the future patches.
> as both active and passive cooling can share the same algorithm,
> which is
>
> 1. if the temperature is higher than a trip point,
> a. if the trend is THERMAL_TREND_RAISING, use higher cooling
> state for this trip point
> b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
> state for this trip point
>
> 2. if the temperature is lower than a trip point, use lower
> cooling state for this trip point.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Reviewed-by: Eduardo Valentin <eduardo.valentin@xxxxxx>
> ---
> drivers/acpi/thermal.c | 8 ++--
> drivers/thermal/thermal_sys.c | 102 ++++++++++++++++++++++++++++++-----------
> 2 files changed, 81 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index 0c755d2..a0b1e88 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -714,9 +714,11 @@ static int thermal_get_trend(struct thermal_zone_device *thermal,
> if (thermal_get_trip_type(thermal, trip, &type))
> return -EINVAL;
>
> - /* Only PASSIVE trip points need TREND */
> - if (type != THERMAL_TRIP_PASSIVE)
> - return -EINVAL;
> + if (type == THERMAL_TRIP_ACTIVE) {
> + /* aggressive active cooling */
> + *trend = THERMAL_TREND_RAISING;
> + return 0;
> + }
>
> /*
> * tz->temperature has already been updated by generic thermal layer,
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index a70ed4c..f3156c1 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -1076,6 +1076,81 @@ void thermal_cooling_device_unregister(struct
> }
> EXPORT_SYMBOL(thermal_cooling_device_unregister);
>
> +/*
> + * Cooling algorithm for active trip points
> + *
> + * 1. if the temperature is higher than a trip point,
> + * a. if the trend is THERMAL_TREND_RAISING, use higher cooling
> + * state for this trip point
> + * b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
> + * state for this trip point
> + *
> + * 2. if the temperature is lower than a trip point, use lower
> + * cooling state for this trip point
> + *
> + * Note that this behaves the same as the previous passive cooling
> + * algorithm.
> + */
> +
> +static void thermal_zone_trip_update(struct thermal_zone_device *tz,
> + int trip, long temp)
> +{
> + struct thermal_cooling_device_instance *instance;
> + struct thermal_cooling_device *cdev = NULL;
> + unsigned long cur_state, max_state;
> + long trip_temp;
> + enum thermal_trend trend;
> +
> + tz->ops->get_trip_temp(tz, trip, &trip_temp);
> +
> + if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
> + /*
> + * compare the current temperature and previous temperature
> + * to get the thermal trend, if no special requirement
> + */
> + if (tz->temperature > tz->last_temperature)
> + trend = THERMAL_TREND_RAISING;
> + else if (tz->temperature < tz->last_temperature)
> + trend = THERMAL_TREND_DROPPING;
> + else
> + trend = THERMAL_TREND_STABLE;
> + }
> +
> + if (temp >= trip_temp) {
> + list_for_each_entry(instance, &tz->cooling_devices, node) {
> + if (instance->trip != trip)
> + continue;
> +
> + cdev = instance->cdev;
> +
> + cdev->ops->get_cur_state(cdev, &cur_state);
> + cdev->ops->get_max_state(cdev, &max_state);
> +
> + if (trend == THERMAL_TREND_RAISING) {
> + cur_state = cur_state < instance->upper ?
> + (cur_state + 1) : instance->upper;
> + } else if (trend == THERMAL_TREND_DROPPING) {
> + cur_state = cur_state > instance->lower ?
> + (cur_state - 1) : instance->lower;
> + }
> + cdev->ops->set_cur_state(cdev, cur_state);
> + }
> + } else { /* below trip */
> + list_for_each_entry(instance, &tz->cooling_devices, node) {
> + if (instance->trip != trip)
> + continue;
> +
> + cdev = instance->cdev;
> + cdev->ops->get_cur_state(cdev, &cur_state);
> +
> + cur_state = cur_state > instance->lower ?
> + (cur_state - 1) : instance->lower;
> + cdev->ops->set_cur_state(cdev, cur_state);
> + }
> + }
> +
> + return;
> +}
> /**
> * thermal_zone_device_update - force an update of a thermal zone's state
> * @ttz: the thermal zone to update
> @@ -1086,9 +1161,6 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
> int count, ret = 0;
> long temp, trip_temp;
> enum thermal_trip_type trip_type;
> - struct thermal_cooling_device_instance *instance;
> - struct thermal_cooling_device *cdev;
> - unsigned long cur_state, max_state;
>
> mutex_lock(&tz->lock);
>
> @@ -1124,29 +1196,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
> tz->ops->notify(tz, count, trip_type);
> break;
> case THERMAL_TRIP_ACTIVE:
> - list_for_each_entry(instance, &tz->cooling_devices,
> - node) {
> - if (instance->trip != count)
> - continue;
> -
> - cdev = instance->cdev;
> -
> - cdev->ops->get_cur_state(cdev, &cur_state);
> - cdev->ops->get_max_state(cdev, &max_state);
> -
> - if (temp >= trip_temp)
> - cur_state =
> - cur_state < instance->upper ?
> - (cur_state + 1) :
> - instance->upper;
> - else
> - cur_state =
> - cur_state > instance->lower ?
> - (cur_state - 1) :
> - instance->lower;
> -
> - cdev->ops->set_cur_state(cdev, cur_state);
> - }
> + thermal_zone_trip_update(tz, count, temp);
> break;
> case THERMAL_TRIP_PASSIVE:
> if (temp >= trip_temp || tz->passive)
> --
> 1.7.9.5
>
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