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SubjectRe: [PATCH] thermal/drivers/cpuidle_cooling: Change the set_cur_state function
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> > From: zhuguangqing <zhuguangqing@xiaomi.com>
> >
> > In the function cpuidle_cooling_set_cur_state(), if current_state is
> > not equal to state and both current_state and state are greater than
> > 0(scene 4 as follows), then maybe it should stop->start or restart
> > idle_inject.
>
> Sorry, I don't get it.
>
> It is an update of the state, why do we need to restart the idle
> injection ? The state change will be automatically take into account by
> the idle injection code at the new injection cycle.
>

Thanks for your comments.

For example, we call cpuidle_cooling_set_cur_state() twice, first time
the input parameter state is 20, second time the input parameter state
is 30.

In current code, in the second call of cpuidle_cooling_set_cur_state(),
current_state == 20, state == 30, then "if (current_state == 0 &&
state > 0)" is not satisfied, "else if (current_state > 0 && !state)"
is not satisfied either, so we just update idle_cdev->state to 30 and
idle_inject_set_duration to new injection cycle,but we do not call
idle injection code.

In the example mentioned above, we should call idle injection code. If
idle_inject_start() takes into account by the idle injection code at
the new injection cycle, then just calling idle_inject_start() is ok.
Otherwise, we need a restart or stop->start process to execute idle
injection code at the new state 30.

> > The scenes changed is as follows,
> >
> > scene current_state state action
> > 1 0 >0 start
> > 2 0 0 do nothing
> > 3 >0 0 stop
> > 4 >0 && !=state >0 stop->start or restart
> > 5 >0 && ==state >0 do nothing
> >
> > Signed-off-by: zhuguangqing <zhuguangqing@xiaomi.com>
> > ---
> > drivers/thermal/cpuidle_cooling.c | 10 ++++++++--
> > 1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/thermal/cpuidle_cooling.c
> b/drivers/thermal/cpuidle_cooling.c
> > index 78e3e8238116..868919ad3dda 100644
> > --- a/drivers/thermal/cpuidle_cooling.c
> > +++ b/drivers/thermal/cpuidle_cooling.c
> > @@ -113,7 +113,7 @@ static int cpuidle_cooling_get_cur_state(struct
> > thermal_cooling_device *cdev,
> > /**
> > * cpuidle_cooling_set_cur_state - Set the current cooling state
> > * @cdev: the thermal cooling device
> > - * @state: the target state
> > + * @state: the target state, max value is 100
> > *
> > * The function checks first if we are initiating the mitigation which
> > * in turn wakes up all the idle injection tasks belonging to the idle
> > @@ -130,6 +130,9 @@ static int cpuidle_cooling_set_cur_state(struct
> > thermal_cooling_device *cdev,
> > unsigned long current_state = idle_cdev->state;
> > unsigned int runtime_us, idle_duration_us;
> >
> > + if (state > 100 || current_state == state)
> > + return 0;
> > +
> > idle_cdev->state = state;
> >
> > idle_inject_get_duration(ii_dev, &runtime_us, &idle_duration_us);
> > @@ -140,8 +143,11 @@ static int cpuidle_cooling_set_cur_state(struct
> > thermal_cooling_device *cdev,
> >
> > if (current_state == 0 && state > 0) {
> > idle_inject_start(ii_dev);
> > - } else if (current_state > 0 && !state) {
> > + } else if (current_state > 0 && !state) {
> > idle_inject_stop(ii_dev);
> > + } else {
> > + idle_inject_stop(ii_dev);
> > + idle_inject_start(ii_dev);
> > }
> >
> > return 0;
> >
>
>
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