From 0fac6893ff6c08d6fab6f56b9550a2c4cee589fd Mon Sep 17 00:00:00 2001 From: Di Shen <di.shen@unisoc.com> Date: Wed, 7 Feb 2024 10:09:23 +0800 Subject: [PATCH] thermal: gov_power_allocator: Avoid overwriting PID coefficients from setup time When the PID coefficients k_* are set via sysfs before the IPA algorithm is triggered then the coefficients would be overwritten after IPA throttle() is called. The old configuration values might be different than the new values estimated by the IPA internal algorithm. There might be a time delay when this overwriting happens. It depends on the thermal zone temperature value. The temperature value needs to cross the first trip point value then IPA algorithms start operating. Although, the PID coefficients setup time should not be affected or linked to any later operating phase and values must not be overwritten. This patch initializes params->sustainable_power when the governor binds to thermal zone to avoid overwriting k_*. The basic function won't be affected, as the k_* still can be estimated if the sustainable_power is modified. Signed-off-by: Di Shen <di.shen@unisoc.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- drivers/thermal/gov_power_allocator.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c index 81e061f183ad1..1b17dc4c219cc 100644 --- a/drivers/thermal/gov_power_allocator.c +++ b/drivers/thermal/gov_power_allocator.c @@ -711,6 +711,8 @@ static int power_allocator_bind(struct thermal_zone_device *tz) if (!tz->tzp->sustainable_power) dev_warn(&tz->device, "power_allocator: sustainable_power will be estimated\n"); + else + params->sustainable_power = tz->tzp->sustainable_power; estimate_pid_constants(tz, tz->tzp->sustainable_power, params->trip_switch_on,