diff mbox

[RESEND,15/16] Thermal: Unify the code for both active and passive cooling

Message ID 1343182273-32096-16-git-send-email-rui.zhang@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Zhang Rui July 25, 2012, 2:11 a.m. UTC
Remove thermal_zone_device_passive(). And use
thermal_zone_trip_update() and thermal_zone_do_update()
for both active and passive cooling.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---
 drivers/thermal/thermal_sys.c |   97 ++++++++++-------------------------------
 include/linux/thermal.h       |    2 +-
 2 files changed, 24 insertions(+), 75 deletions(-)

Comments

Rafael Wysocki July 25, 2012, 8:41 p.m. UTC | #1
On Wednesday, July 25, 2012, Zhang Rui wrote:
> Remove thermal_zone_device_passive(). And use
> thermal_zone_trip_update() and thermal_zone_do_update()
> for both active and passive cooling.
> 
> Signed-off-by: Zhang Rui <rui.zhang@intel.com>

Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>

> ---
>  drivers/thermal/thermal_sys.c |   97 ++++++++++-------------------------------
>  include/linux/thermal.h       |    2 +-
>  2 files changed, 24 insertions(+), 75 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index ee10df5..23a5c86 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -730,73 +730,6 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
>  				      msecs_to_jiffies(delay));
>  }
>  
> -static void thermal_zone_device_passive(struct thermal_zone_device *tz,
> -					int temp, int trip_temp, int trip)
> -{
> -	enum thermal_trend trend;
> -	struct thermal_instance *instance;
> -	struct thermal_cooling_device *cdev;
> -	long state, max_state;
> -
> -	/*
> -	 * 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 (temp >= trip_temp) {
> -		tz->passive = true;
> -
> -		thermal_get_trend(tz, trip, &trend);
> -
> -		/* Heating up? */
> -		if (trend == THERMAL_TREND_RAISING) {
> -			list_for_each_entry(instance, &tz->thermal_instances,
> -					    tz_node) {
> -				if (instance->trip != trip)
> -					continue;
> -				cdev = instance->cdev;
> -				cdev->ops->get_cur_state(cdev, &state);
> -				cdev->ops->get_max_state(cdev, &max_state);
> -				if (state++ < max_state)
> -					cdev->ops->set_cur_state(cdev, state);
> -			}
> -		} else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
> -			list_for_each_entry(instance, &tz->thermal_instances,
> -					    tz_node) {
> -				if (instance->trip != trip)
> -					continue;
> -				cdev = instance->cdev;
> -				cdev->ops->get_cur_state(cdev, &state);
> -				cdev->ops->get_max_state(cdev, &max_state);
> -				if (state > 0)
> -					cdev->ops->set_cur_state(cdev, --state);
> -			}
> -		}
> -		return;
> -	}
> -
> -	/*
> -	 * Below Trip?
> -	 * -----------
> -	 * Implement passive cooling hysteresis to slowly increase performance
> -	 * and avoid thrashing around the passive trip point.  Note that we
> -	 * assume symmetry.
> -	 */
> -	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
> -		if (instance->trip != trip)
> -			continue;
> -		cdev = instance->cdev;
> -		cdev->ops->get_cur_state(cdev, &state);
> -		cdev->ops->get_max_state(cdev, &max_state);
> -		if (state > 0)
> -			cdev->ops->set_cur_state(cdev, --state);
> -		if (state == 0)
> -			tz->passive = false;
> -	}
> -}
> -
>  static void thermal_zone_device_check(struct work_struct *work)
>  {
>  	struct thermal_zone_device *tz = container_of(work, struct
> @@ -1118,7 +1051,7 @@ static void thermal_zone_do_update(struct thermal_zone_device *tz)
>  }
>  
>  /*
> - * Cooling algorithm for active trip points
> + * Cooling algorithm for both active and passive cooling
>   *
>   * 1. if the temperature is higher than a trip point,
>   *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
> @@ -1140,9 +1073,16 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
>  	struct thermal_cooling_device *cdev = NULL;
>  	unsigned long cur_state, max_state;
>  	long trip_temp;
> +	enum thermal_trip_type trip_type;
>  	enum thermal_trend trend;
>  
> -	tz->ops->get_trip_temp(tz, trip, &trip_temp);
> +	if (trip == THERMAL_TRIPS_NONE) {
> +		trip_temp = tz->forced_passive;
> +		trip_type = THERMAL_TRIPS_NONE;
> +	} else {
> +		tz->ops->get_trip_temp(tz, trip, &trip_temp);
> +		tz->ops->get_trip_type(tz, trip, &trip_type);
> +	}
>  
>  	if (temp >= trip_temp) {
>  		thermal_get_trend(tz, trip, &trend);
> @@ -1163,6 +1103,12 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
>  				cur_state = cur_state > instance->lower ?
>  				    (cur_state - 1) : instance->lower;
>  			}
> +
> +			/* activate a passive thermal instance */
> +			if (trip_type == THERMAL_TRIP_PASSIVE &&
> +			    instance->target == THERMAL_NO_TARGET)
> +				tz->passive++;
> +
>  			instance->target = cur_state;
>  			cdev->updated = false; /* cooling device needs update */
>  		}
> @@ -1179,6 +1125,11 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
>  
>  			cur_state = cur_state > instance->lower ?
>  				    (cur_state - 1) : THERMAL_NO_TARGET;
> +
> +			/* deactivate a passive thermal instance */
> +			if (trip_type == THERMAL_TRIP_PASSIVE &&
> +			    cur_state == THERMAL_NO_TARGET)
> +				tz->passive--;
>  			instance->target = cur_state;
>  			cdev->updated = false; /* cooling device needs update */
>  		}
> @@ -1235,16 +1186,14 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
>  			break;
>  		case THERMAL_TRIP_PASSIVE:
>  			if (temp >= trip_temp || tz->passive)
> -				thermal_zone_device_passive(tz, temp,
> -							    trip_temp, count);
> +				thermal_zone_trip_update(tz, count, temp);
>  			break;
>  		}
>  	}
>  
> -	thermal_zone_do_update(tz);
>  	if (tz->forced_passive)
> -		thermal_zone_device_passive(tz, temp, tz->forced_passive,
> -					    THERMAL_TRIPS_NONE);
> +		thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
> +	thermal_zone_do_update(tz);
>  
>  leave:
>  	if (tz->passive)
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 3e66214..06fd04d 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -121,7 +121,7 @@ struct thermal_zone_device {
>  	int polling_delay;
>  	int temperature;
>  	int last_temperature;
> -	bool passive;
> +	int passive;
>  	unsigned int forced_passive;
>  	const struct thermal_zone_device_ops *ops;
>  	struct list_head thermal_instances;
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Eduardo Valentin Aug. 9, 2012, 8:26 a.m. UTC | #2
Hello,



On Wed, Jul 25, 2012 at 5:11 AM, Zhang Rui <rui.zhang@intel.com> wrote:
> Remove thermal_zone_device_passive(). And use
> thermal_zone_trip_update() and thermal_zone_do_update()
> for both active and passive cooling.

I believe you need to refresh this patch on top of your new changes on
this series. It is not applying cleanly due to changes done in
previous patches.

>
> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> ---
>  drivers/thermal/thermal_sys.c |   97 ++++++++++-------------------------------
>  include/linux/thermal.h       |    2 +-
>  2 files changed, 24 insertions(+), 75 deletions(-)
>
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index ee10df5..23a5c86 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -730,73 +730,6 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
>                                       msecs_to_jiffies(delay));
>  }
>
> -static void thermal_zone_device_passive(struct thermal_zone_device *tz,
> -                                       int temp, int trip_temp, int trip)
> -{
> -       enum thermal_trend trend;
> -       struct thermal_instance *instance;
> -       struct thermal_cooling_device *cdev;
> -       long state, max_state;
> -
> -       /*
> -        * 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 (temp >= trip_temp) {
> -               tz->passive = true;
> -
> -               thermal_get_trend(tz, trip, &trend);
> -
> -               /* Heating up? */
> -               if (trend == THERMAL_TREND_RAISING) {
> -                       list_for_each_entry(instance, &tz->thermal_instances,
> -                                           tz_node) {
> -                               if (instance->trip != trip)
> -                                       continue;
> -                               cdev = instance->cdev;
> -                               cdev->ops->get_cur_state(cdev, &state);
> -                               cdev->ops->get_max_state(cdev, &max_state);
> -                               if (state++ < max_state)
> -                                       cdev->ops->set_cur_state(cdev, state);
> -                       }
> -               } else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
> -                       list_for_each_entry(instance, &tz->thermal_instances,
> -                                           tz_node) {
> -                               if (instance->trip != trip)
> -                                       continue;
> -                               cdev = instance->cdev;
> -                               cdev->ops->get_cur_state(cdev, &state);
> -                               cdev->ops->get_max_state(cdev, &max_state);
> -                               if (state > 0)
> -                                       cdev->ops->set_cur_state(cdev, --state);
> -                       }
> -               }
> -               return;
> -       }
> -
> -       /*
> -        * Below Trip?
> -        * -----------
> -        * Implement passive cooling hysteresis to slowly increase performance
> -        * and avoid thrashing around the passive trip point.  Note that we
> -        * assume symmetry.
> -        */
> -       list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
> -               if (instance->trip != trip)
> -                       continue;
> -               cdev = instance->cdev;
> -               cdev->ops->get_cur_state(cdev, &state);
> -               cdev->ops->get_max_state(cdev, &max_state);
> -               if (state > 0)
> -                       cdev->ops->set_cur_state(cdev, --state);
> -               if (state == 0)
> -                       tz->passive = false;
> -       }
> -}
> -
>  static void thermal_zone_device_check(struct work_struct *work)
>  {
>         struct thermal_zone_device *tz = container_of(work, struct
> @@ -1118,7 +1051,7 @@ static void thermal_zone_do_update(struct thermal_zone_device *tz)
>  }
>
>  /*
> - * Cooling algorithm for active trip points
> + * Cooling algorithm for both active and passive cooling
>   *
>   * 1. if the temperature is higher than a trip point,
>   *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
> @@ -1140,9 +1073,16 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
>         struct thermal_cooling_device *cdev = NULL;
>         unsigned long cur_state, max_state;
>         long trip_temp;
> +       enum thermal_trip_type trip_type;
>         enum thermal_trend trend;
>
> -       tz->ops->get_trip_temp(tz, trip, &trip_temp);
> +       if (trip == THERMAL_TRIPS_NONE) {
> +               trip_temp = tz->forced_passive;
> +               trip_type = THERMAL_TRIPS_NONE;
> +       } else {
> +               tz->ops->get_trip_temp(tz, trip, &trip_temp);
> +               tz->ops->get_trip_type(tz, trip, &trip_type);
> +       }
>
>         if (temp >= trip_temp) {
>                 thermal_get_trend(tz, trip, &trend);
> @@ -1163,6 +1103,12 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
>                                 cur_state = cur_state > instance->lower ?
>                                     (cur_state - 1) : instance->lower;
>                         }
> +
> +                       /* activate a passive thermal instance */
> +                       if (trip_type == THERMAL_TRIP_PASSIVE &&
> +                           instance->target == THERMAL_NO_TARGET)
> +                               tz->passive++;
> +
>                         instance->target = cur_state;
>                         cdev->updated = false; /* cooling device needs update */
>                 }
> @@ -1179,6 +1125,11 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
>
>                         cur_state = cur_state > instance->lower ?
>                                     (cur_state - 1) : THERMAL_NO_TARGET;
> +
> +                       /* deactivate a passive thermal instance */
> +                       if (trip_type == THERMAL_TRIP_PASSIVE &&
> +                           cur_state == THERMAL_NO_TARGET)
> +                               tz->passive--;
>                         instance->target = cur_state;
>                         cdev->updated = false; /* cooling device needs update */
>                 }
> @@ -1235,16 +1186,14 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
>                         break;
>                 case THERMAL_TRIP_PASSIVE:
>                         if (temp >= trip_temp || tz->passive)
> -                               thermal_zone_device_passive(tz, temp,
> -                                                           trip_temp, count);
> +                               thermal_zone_trip_update(tz, count, temp);
>                         break;
>                 }
>         }
>
> -       thermal_zone_do_update(tz);
>         if (tz->forced_passive)
> -               thermal_zone_device_passive(tz, temp, tz->forced_passive,
> -                                           THERMAL_TRIPS_NONE);
> +               thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
> +       thermal_zone_do_update(tz);
>
>  leave:
>         if (tz->passive)
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 3e66214..06fd04d 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -121,7 +121,7 @@ struct thermal_zone_device {
>         int polling_delay;
>         int temperature;
>         int last_temperature;
> -       bool passive;
> +       int passive;
>         unsigned int forced_passive;
>         const struct thermal_zone_device_ops *ops;
>         struct list_head thermal_instances;
> --
> 1.7.9.5
>
Zhang Rui Aug. 9, 2012, 8:32 a.m. UTC | #3
On ?, 2012-08-09 at 11:26 +0300, Valentin, Eduardo wrote:
> Hello,
> 
> 
> 
> On Wed, Jul 25, 2012 at 5:11 AM, Zhang Rui <rui.zhang@intel.com> wrote:
> > Remove thermal_zone_device_passive(). And use
> > thermal_zone_trip_update() and thermal_zone_do_update()
> > for both active and passive cooling.
> 
> I believe you need to refresh this patch on top of your new changes on
> this series. It is not applying cleanly due to changes done in
> previous patches.
> 
hmm,

probably you are testing patches from different version.
does the problem still exist in Patch set V4?

thanks,
rui

> >
> > Signed-off-by: Zhang Rui <rui.zhang@intel.com>
> > ---
> >  drivers/thermal/thermal_sys.c |   97 ++++++++++-------------------------------
> >  include/linux/thermal.h       |    2 +-
> >  2 files changed, 24 insertions(+), 75 deletions(-)
> >
> > diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> > index ee10df5..23a5c86 100644
> > --- a/drivers/thermal/thermal_sys.c
> > +++ b/drivers/thermal/thermal_sys.c
> > @@ -730,73 +730,6 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
> >                                       msecs_to_jiffies(delay));
> >  }
> >
> > -static void thermal_zone_device_passive(struct thermal_zone_device *tz,
> > -                                       int temp, int trip_temp, int trip)
> > -{
> > -       enum thermal_trend trend;
> > -       struct thermal_instance *instance;
> > -       struct thermal_cooling_device *cdev;
> > -       long state, max_state;
> > -
> > -       /*
> > -        * 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 (temp >= trip_temp) {
> > -               tz->passive = true;
> > -
> > -               thermal_get_trend(tz, trip, &trend);
> > -
> > -               /* Heating up? */
> > -               if (trend == THERMAL_TREND_RAISING) {
> > -                       list_for_each_entry(instance, &tz->thermal_instances,
> > -                                           tz_node) {
> > -                               if (instance->trip != trip)
> > -                                       continue;
> > -                               cdev = instance->cdev;
> > -                               cdev->ops->get_cur_state(cdev, &state);
> > -                               cdev->ops->get_max_state(cdev, &max_state);
> > -                               if (state++ < max_state)
> > -                                       cdev->ops->set_cur_state(cdev, state);
> > -                       }
> > -               } else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
> > -                       list_for_each_entry(instance, &tz->thermal_instances,
> > -                                           tz_node) {
> > -                               if (instance->trip != trip)
> > -                                       continue;
> > -                               cdev = instance->cdev;
> > -                               cdev->ops->get_cur_state(cdev, &state);
> > -                               cdev->ops->get_max_state(cdev, &max_state);
> > -                               if (state > 0)
> > -                                       cdev->ops->set_cur_state(cdev, --state);
> > -                       }
> > -               }
> > -               return;
> > -       }
> > -
> > -       /*
> > -        * Below Trip?
> > -        * -----------
> > -        * Implement passive cooling hysteresis to slowly increase performance
> > -        * and avoid thrashing around the passive trip point.  Note that we
> > -        * assume symmetry.
> > -        */
> > -       list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
> > -               if (instance->trip != trip)
> > -                       continue;
> > -               cdev = instance->cdev;
> > -               cdev->ops->get_cur_state(cdev, &state);
> > -               cdev->ops->get_max_state(cdev, &max_state);
> > -               if (state > 0)
> > -                       cdev->ops->set_cur_state(cdev, --state);
> > -               if (state == 0)
> > -                       tz->passive = false;
> > -       }
> > -}
> > -
> >  static void thermal_zone_device_check(struct work_struct *work)
> >  {
> >         struct thermal_zone_device *tz = container_of(work, struct
> > @@ -1118,7 +1051,7 @@ static void thermal_zone_do_update(struct thermal_zone_device *tz)
> >  }
> >
> >  /*
> > - * Cooling algorithm for active trip points
> > + * Cooling algorithm for both active and passive cooling
> >   *
> >   * 1. if the temperature is higher than a trip point,
> >   *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
> > @@ -1140,9 +1073,16 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
> >         struct thermal_cooling_device *cdev = NULL;
> >         unsigned long cur_state, max_state;
> >         long trip_temp;
> > +       enum thermal_trip_type trip_type;
> >         enum thermal_trend trend;
> >
> > -       tz->ops->get_trip_temp(tz, trip, &trip_temp);
> > +       if (trip == THERMAL_TRIPS_NONE) {
> > +               trip_temp = tz->forced_passive;
> > +               trip_type = THERMAL_TRIPS_NONE;
> > +       } else {
> > +               tz->ops->get_trip_temp(tz, trip, &trip_temp);
> > +               tz->ops->get_trip_type(tz, trip, &trip_type);
> > +       }
> >
> >         if (temp >= trip_temp) {
> >                 thermal_get_trend(tz, trip, &trend);
> > @@ -1163,6 +1103,12 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
> >                                 cur_state = cur_state > instance->lower ?
> >                                     (cur_state - 1) : instance->lower;
> >                         }
> > +
> > +                       /* activate a passive thermal instance */
> > +                       if (trip_type == THERMAL_TRIP_PASSIVE &&
> > +                           instance->target == THERMAL_NO_TARGET)
> > +                               tz->passive++;
> > +
> >                         instance->target = cur_state;
> >                         cdev->updated = false; /* cooling device needs update */
> >                 }
> > @@ -1179,6 +1125,11 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
> >
> >                         cur_state = cur_state > instance->lower ?
> >                                     (cur_state - 1) : THERMAL_NO_TARGET;
> > +
> > +                       /* deactivate a passive thermal instance */
> > +                       if (trip_type == THERMAL_TRIP_PASSIVE &&
> > +                           cur_state == THERMAL_NO_TARGET)
> > +                               tz->passive--;
> >                         instance->target = cur_state;
> >                         cdev->updated = false; /* cooling device needs update */
> >                 }
> > @@ -1235,16 +1186,14 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
> >                         break;
> >                 case THERMAL_TRIP_PASSIVE:
> >                         if (temp >= trip_temp || tz->passive)
> > -                               thermal_zone_device_passive(tz, temp,
> > -                                                           trip_temp, count);
> > +                               thermal_zone_trip_update(tz, count, temp);
> >                         break;
> >                 }
> >         }
> >
> > -       thermal_zone_do_update(tz);
> >         if (tz->forced_passive)
> > -               thermal_zone_device_passive(tz, temp, tz->forced_passive,
> > -                                           THERMAL_TRIPS_NONE);
> > +               thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
> > +       thermal_zone_do_update(tz);
> >
> >  leave:
> >         if (tz->passive)
> > diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> > index 3e66214..06fd04d 100644
> > --- a/include/linux/thermal.h
> > +++ b/include/linux/thermal.h
> > @@ -121,7 +121,7 @@ struct thermal_zone_device {
> >         int polling_delay;
> >         int temperature;
> >         int last_temperature;
> > -       bool passive;
> > +       int passive;
> >         unsigned int forced_passive;
> >         const struct thermal_zone_device_ops *ops;
> >         struct list_head thermal_instances;
> > --
> > 1.7.9.5
> >
> 
> 
> 


--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox

Patch

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index ee10df5..23a5c86 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -730,73 +730,6 @@  static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 				      msecs_to_jiffies(delay));
 }
 
-static void thermal_zone_device_passive(struct thermal_zone_device *tz,
-					int temp, int trip_temp, int trip)
-{
-	enum thermal_trend trend;
-	struct thermal_instance *instance;
-	struct thermal_cooling_device *cdev;
-	long state, max_state;
-
-	/*
-	 * 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 (temp >= trip_temp) {
-		tz->passive = true;
-
-		thermal_get_trend(tz, trip, &trend);
-
-		/* Heating up? */
-		if (trend == THERMAL_TREND_RAISING) {
-			list_for_each_entry(instance, &tz->thermal_instances,
-					    tz_node) {
-				if (instance->trip != trip)
-					continue;
-				cdev = instance->cdev;
-				cdev->ops->get_cur_state(cdev, &state);
-				cdev->ops->get_max_state(cdev, &max_state);
-				if (state++ < max_state)
-					cdev->ops->set_cur_state(cdev, state);
-			}
-		} else if (trend == THERMAL_TREND_DROPPING) { /* Cooling off? */
-			list_for_each_entry(instance, &tz->thermal_instances,
-					    tz_node) {
-				if (instance->trip != trip)
-					continue;
-				cdev = instance->cdev;
-				cdev->ops->get_cur_state(cdev, &state);
-				cdev->ops->get_max_state(cdev, &max_state);
-				if (state > 0)
-					cdev->ops->set_cur_state(cdev, --state);
-			}
-		}
-		return;
-	}
-
-	/*
-	 * Below Trip?
-	 * -----------
-	 * Implement passive cooling hysteresis to slowly increase performance
-	 * and avoid thrashing around the passive trip point.  Note that we
-	 * assume symmetry.
-	 */
-	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
-		if (instance->trip != trip)
-			continue;
-		cdev = instance->cdev;
-		cdev->ops->get_cur_state(cdev, &state);
-		cdev->ops->get_max_state(cdev, &max_state);
-		if (state > 0)
-			cdev->ops->set_cur_state(cdev, --state);
-		if (state == 0)
-			tz->passive = false;
-	}
-}
-
 static void thermal_zone_device_check(struct work_struct *work)
 {
 	struct thermal_zone_device *tz = container_of(work, struct
@@ -1118,7 +1051,7 @@  static void thermal_zone_do_update(struct thermal_zone_device *tz)
 }
 
 /*
- * Cooling algorithm for active trip points
+ * Cooling algorithm for both active and passive cooling
  *
  * 1. if the temperature is higher than a trip point,
  *    a. if the trend is THERMAL_TREND_RAISING, use higher cooling
@@ -1140,9 +1073,16 @@  static void thermal_zone_trip_update(struct thermal_zone_device *tz,
 	struct thermal_cooling_device *cdev = NULL;
 	unsigned long cur_state, max_state;
 	long trip_temp;
+	enum thermal_trip_type trip_type;
 	enum thermal_trend trend;
 
-	tz->ops->get_trip_temp(tz, trip, &trip_temp);
+	if (trip == THERMAL_TRIPS_NONE) {
+		trip_temp = tz->forced_passive;
+		trip_type = THERMAL_TRIPS_NONE;
+	} else {
+		tz->ops->get_trip_temp(tz, trip, &trip_temp);
+		tz->ops->get_trip_type(tz, trip, &trip_type);
+	}
 
 	if (temp >= trip_temp) {
 		thermal_get_trend(tz, trip, &trend);
@@ -1163,6 +1103,12 @@  static void thermal_zone_trip_update(struct thermal_zone_device *tz,
 				cur_state = cur_state > instance->lower ?
 				    (cur_state - 1) : instance->lower;
 			}
+
+			/* activate a passive thermal instance */
+			if (trip_type == THERMAL_TRIP_PASSIVE &&
+			    instance->target == THERMAL_NO_TARGET)
+				tz->passive++;
+
 			instance->target = cur_state;
 			cdev->updated = false; /* cooling device needs update */
 		}
@@ -1179,6 +1125,11 @@  static void thermal_zone_trip_update(struct thermal_zone_device *tz,
 
 			cur_state = cur_state > instance->lower ?
 				    (cur_state - 1) : THERMAL_NO_TARGET;
+
+			/* deactivate a passive thermal instance */
+			if (trip_type == THERMAL_TRIP_PASSIVE &&
+			    cur_state == THERMAL_NO_TARGET)
+				tz->passive--;
 			instance->target = cur_state;
 			cdev->updated = false; /* cooling device needs update */
 		}
@@ -1235,16 +1186,14 @@  void thermal_zone_device_update(struct thermal_zone_device *tz)
 			break;
 		case THERMAL_TRIP_PASSIVE:
 			if (temp >= trip_temp || tz->passive)
-				thermal_zone_device_passive(tz, temp,
-							    trip_temp, count);
+				thermal_zone_trip_update(tz, count, temp);
 			break;
 		}
 	}
 
-	thermal_zone_do_update(tz);
 	if (tz->forced_passive)
-		thermal_zone_device_passive(tz, temp, tz->forced_passive,
-					    THERMAL_TRIPS_NONE);
+		thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
+	thermal_zone_do_update(tz);
 
 leave:
 	if (tz->passive)
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 3e66214..06fd04d 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -121,7 +121,7 @@  struct thermal_zone_device {
 	int polling_delay;
 	int temperature;
 	int last_temperature;
-	bool passive;
+	int passive;
 	unsigned int forced_passive;
 	const struct thermal_zone_device_ops *ops;
 	struct list_head thermal_instances;