diff options
| -rw-r--r-- | drivers/thermal/gov_power_allocator.c | 52 |
1 files changed, 40 insertions, 12 deletions
diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c index 2e20085ed217..d7e4b9f6af60 100644 --- a/drivers/thermal/gov_power_allocator.c +++ b/drivers/thermal/gov_power_allocator.c @@ -63,6 +63,8 @@ static inline s64 div_frac(s64 x, s64 y) * @trip_max_desired_temperature: last passive trip point of the thermal * zone. The temperature we are * controlling for. + * @sustainable_power: Sustainable power (heat) that this thermal zone can + * dissipate */ struct power_allocator_params { bool allocated_tzp; @@ -70,6 +72,7 @@ struct power_allocator_params { s32 prev_err; int trip_switch_on; int trip_max_desired_temperature; + u32 sustainable_power; }; /** @@ -118,10 +121,6 @@ static u32 estimate_sustainable_power(struct thermal_zone_device *tz) * * This function is used to update the estimation of the PID * controller constants in struct thermal_zone_parameters. - * Sustainable power is provided in case it was estimated. The - * estimated sustainable_power should not be stored in the - * thermal_zone_parameters so it has to be passed explicitly to this - * function. * * If @force is not set, the values in the thermal zone's parameters * are preserved if they are not zero. If @force is set, the values @@ -172,6 +171,42 @@ static void estimate_pid_constants(struct thermal_zone_device *tz, } /** + * get_sustainable_power() - Get the right sustainable power + * @tz: thermal zone for which to estimate the constants + * @params: parameters for the power allocator governor + * @control_temp: target temperature for the power allocator governor + * + * This function is used for getting the proper sustainable power value based + * on variables which might be updated by the user sysfs interface. If that + * happen the new value is going to be estimated and updated. It is also used + * after thermal zone binding, where the initial values where set to 0. + */ +static u32 get_sustainable_power(struct thermal_zone_device *tz, + struct power_allocator_params *params, + int control_temp) +{ + u32 sustainable_power; + + if (!tz->tzp->sustainable_power) + sustainable_power = estimate_sustainable_power(tz); + else + sustainable_power = tz->tzp->sustainable_power; + + /* Check if it's init value 0 or there was update via sysfs */ + if (sustainable_power != params->sustainable_power) { + estimate_pid_constants(tz, sustainable_power, + params->trip_switch_on, control_temp, + true); + + /* Do the estimation only once and make available in sysfs */ + tz->tzp->sustainable_power = sustainable_power; + params->sustainable_power = sustainable_power; + } + + return sustainable_power; +} + +/** * pid_controller() - PID controller * @tz: thermal zone we are operating in * @control_temp: the target temperature in millicelsius @@ -200,14 +235,7 @@ static u32 pid_controller(struct thermal_zone_device *tz, max_power_frac = int_to_frac(max_allocatable_power); - if (tz->tzp->sustainable_power) { - sustainable_power = tz->tzp->sustainable_power; - } else { - sustainable_power = estimate_sustainable_power(tz); - estimate_pid_constants(tz, sustainable_power, - params->trip_switch_on, control_temp, - true); - } + sustainable_power = get_sustainable_power(tz, params, control_temp); err = control_temp - tz->temperature; err = int_to_frac(err); |