| Message ID | 2289003.iZASKD2KPV@kreacher (mailing list archive) |
|---|---|
| State | In Next |
| Delegated to: | Rafael Wysocki |
| Headers | show |
| Series | thermal: core: Redesign the governor interface | expand |
On 4/10/24 17:04, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > The Bang-Bang governor really is only concerned about trip point > crossing, so it can use the new .trip_crossed() callback instead of > .throttle() that is not particularly suitable for it. > > Modify it to do so which also takes trip hysteresis into account, so the > governor does not need to use it directly any more. > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- > drivers/thermal/gov_bang_bang.c | 31 +++++++++++++------------------ > 1 file changed, 13 insertions(+), 18 deletions(-) > > Index: linux-pm/drivers/thermal/gov_bang_bang.c > =================================================================== > --- linux-pm.orig/drivers/thermal/gov_bang_bang.c > +++ linux-pm/drivers/thermal/gov_bang_bang.c > @@ -13,8 +13,9 @@ > > #include "thermal_core.h" > > -static int thermal_zone_trip_update(struct thermal_zone_device *tz, > - const struct thermal_trip *trip) > +static void thermal_zone_trip_update(struct thermal_zone_device *tz, > + const struct thermal_trip *trip, > + bool crossed_up) > { > int trip_index = thermal_zone_trip_id(tz, trip); > struct thermal_instance *instance; > @@ -43,13 +44,12 @@ static int thermal_zone_trip_update(stru > } > > /* > - * enable fan when temperature exceeds trip_temp and disable > - * the fan in case it falls below trip_temp minus hysteresis > + * Enable the fan when the trip is crossed on the way up and > + * disable it when the trip is crossed on the way down. > */ > - if (instance->target == 0 && tz->temperature >= trip->temperature) > + if (instance->target == 0 && crossed_up) > instance->target = 1; > - else if (instance->target == 1 && > - tz->temperature < trip->temperature - trip->hysteresis) > + else if (instance->target == 1 && !crossed_up) > instance->target = 0; > > dev_dbg(&instance->cdev->device, "target=%d\n", > @@ -59,14 +59,13 @@ static int thermal_zone_trip_update(stru > instance->cdev->updated = false; /* cdev needs update */ > mutex_unlock(&instance->cdev->lock); > } > - > - return 0; > } > > /** > * bang_bang_control - controls devices associated with the given zone > * @tz: thermal_zone_device > * @trip: the trip point > + * @crossed_up: whether or not the trip has been crossed on the way up > * > * Regulation Logic: a two point regulation, deliver cooling state depending > * on the previous state shown in this diagram: > @@ -90,26 +89,22 @@ static int thermal_zone_trip_update(stru > * (trip_temp - hyst) so that the fan gets turned off again. > * > */ > -static int bang_bang_control(struct thermal_zone_device *tz, > - const struct thermal_trip *trip) > +static void bang_bang_control(struct thermal_zone_device *tz, > + const struct thermal_trip *trip, > + bool crossed_up) > { > struct thermal_instance *instance; > - int ret; > > lockdep_assert_held(&tz->lock); > > - ret = thermal_zone_trip_update(tz, trip); > - if (ret) > - return ret; > + thermal_zone_trip_update(tz, trip, crossed_up); > > list_for_each_entry(instance, &tz->thermal_instances, tz_node) > thermal_cdev_update(instance->cdev); > - > - return 0; > } > > static struct thermal_governor thermal_gov_bang_bang = { > .name = "bang_bang", > - .throttle = bang_bang_control, > + .trip_crossed = bang_bang_control, > }; > THERMAL_GOVERNOR_DECLARE(thermal_gov_bang_bang); > > > LGTM Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
On 10/04/2024 18:04, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > The Bang-Bang governor really is only concerned about trip point > crossing, so it can use the new .trip_crossed() callback instead of > .throttle() that is not particularly suitable for it. > > Modify it to do so which also takes trip hysteresis into account, so the > governor does not need to use it directly any more. > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Index: linux-pm/drivers/thermal/gov_bang_bang.c =================================================================== --- linux-pm.orig/drivers/thermal/gov_bang_bang.c +++ linux-pm/drivers/thermal/gov_bang_bang.c @@ -13,8 +13,9 @@ #include "thermal_core.h" -static int thermal_zone_trip_update(struct thermal_zone_device *tz, - const struct thermal_trip *trip) +static void thermal_zone_trip_update(struct thermal_zone_device *tz, + const struct thermal_trip *trip, + bool crossed_up) { int trip_index = thermal_zone_trip_id(tz, trip); struct thermal_instance *instance; @@ -43,13 +44,12 @@ static int thermal_zone_trip_update(stru } /* - * enable fan when temperature exceeds trip_temp and disable - * the fan in case it falls below trip_temp minus hysteresis + * Enable the fan when the trip is crossed on the way up and + * disable it when the trip is crossed on the way down. */ - if (instance->target == 0 && tz->temperature >= trip->temperature) + if (instance->target == 0 && crossed_up) instance->target = 1; - else if (instance->target == 1 && - tz->temperature < trip->temperature - trip->hysteresis) + else if (instance->target == 1 && !crossed_up) instance->target = 0; dev_dbg(&instance->cdev->device, "target=%d\n", @@ -59,14 +59,13 @@ static int thermal_zone_trip_update(stru instance->cdev->updated = false; /* cdev needs update */ mutex_unlock(&instance->cdev->lock); } - - return 0; } /** * bang_bang_control - controls devices associated with the given zone * @tz: thermal_zone_device * @trip: the trip point + * @crossed_up: whether or not the trip has been crossed on the way up * * Regulation Logic: a two point regulation, deliver cooling state depending * on the previous state shown in this diagram: @@ -90,26 +89,22 @@ static int thermal_zone_trip_update(stru * (trip_temp - hyst) so that the fan gets turned off again. * */ -static int bang_bang_control(struct thermal_zone_device *tz, - const struct thermal_trip *trip) +static void bang_bang_control(struct thermal_zone_device *tz, + const struct thermal_trip *trip, + bool crossed_up) { struct thermal_instance *instance; - int ret; lockdep_assert_held(&tz->lock); - ret = thermal_zone_trip_update(tz, trip); - if (ret) - return ret; + thermal_zone_trip_update(tz, trip, crossed_up); list_for_each_entry(instance, &tz->thermal_instances, tz_node) thermal_cdev_update(instance->cdev); - - return 0; } static struct thermal_governor thermal_gov_bang_bang = { .name = "bang_bang", - .throttle = bang_bang_control, + .trip_crossed = bang_bang_control, }; THERMAL_GOVERNOR_DECLARE(thermal_gov_bang_bang);