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

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Date:	Wed, 10 Apr 2013 15:06:15 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Andrew Bresticker <abrestic@...omium.org>
Cc:	Eduardo Valentin <eduardo.valentin@...com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: step_wise: set throttle target within thermal
 instance limits

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.

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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