linux-kernel - Re: [PATCH] thermal: step_wise: set throttle target within thermal instance limits

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Date:	Fri, 12 Apr 2013 07:25:23 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Eduardo Valentin <eduardo.valentin@...com>
Cc:	Andrew Bresticker <abrestic@...omium.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: step_wise: set throttle target within thermal
 instance limits

On Wed, 2013-04-10 at 16:22 -0400, Eduardo Valentin wrote:
> On 10-04-2013 03:06, Zhang Rui wrote:
> > On Tue, 2013-04-09 at 14:59 -0700, Andrew Bresticker wrote:
> >> When selecting a target cooling state in get_target_state(), make sure
> >> that the state is at least as high as the minimum when the temperature
> >> is rising and at least as low as the maximum when the temperature is
> >> falling.  This is necessary because, in the THREAML_TREND_RAISING and
> >> THERMAL_TREND_DROPPING cases, the current state may only be incremented
> >> or decremented by one even if it is outside the bounds of the thermal
> >> instance.  This might occur, for example, if the CPU is heating up
> >> and hits a thermal trip point for the first time when it's frequency
> >> is much higher than the range specified by the thermal instance
> >> corresponding to the trip point.
> >>
> >> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
> >
> > applied.
> 
> Rui,
> 
> Can you please add my:
> 
> Acked-by: Eduardo Valentin <eduardo.valentin@...com>
> 
sure. Thanks for reviewing.

thanks,
rui
> 
> Thanks,
> >
> > thanks,
> > rui
> >> ---
> >>   drivers/thermal/step_wise.c | 10 ++++++++--
> >>   1 file changed, 8 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
> >> index 407cde3..ca4f79f 100644
> >> --- a/drivers/thermal/step_wise.c
> >> +++ b/drivers/thermal/step_wise.c
> >> @@ -59,9 +59,12 @@ static unsigned long get_target_state(struct thermal_instance *instance,
> >>
> >>   	switch (trend) {
> >>   	case THERMAL_TREND_RAISING:
> >> -		if (throttle)
> >> +		if (throttle) {
> >>   			cur_state = cur_state < instance->upper ?
> >>   				    (cur_state + 1) : instance->upper;
> >> +			if (cur_state < instance->lower)
> >> +				cur_state = instance->lower;
> >> +		}
> >>   		break;
> >>   	case THERMAL_TREND_RAISE_FULL:
> >>   		if (throttle)
> >> @@ -71,8 +74,11 @@ static unsigned long get_target_state(struct thermal_instance *instance,
> >>   		if (cur_state == instance->lower) {
> >>   			if (!throttle)
> >>   				cur_state = -1;
> >> -		} else
> >> +		} else {
> >>   			cur_state -= 1;
> >> +			if (cur_state > instance->upper)
> >> +				cur_state = instance->upper;
> >> +		}
> >>   		break;
> >>   	case THERMAL_TREND_DROP_FULL:
> >>   		if (cur_state == instance->lower) {
> >
> >
> >
> >
> 


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