linux-kernel - Re: [PATCH 1/4] thermal: Add new thermal trend type to support quick cooling

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Date:	Fri, 23 Nov 2012 09:35:03 +0530
From:	Amit Kachhap <amit.kachhap@...aro.org>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	linux-pm@...ts.linux-foundation.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	durgadoss.r@...el.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
	jonghwa3.lee@...sung.com
Subject: Re: [PATCH 1/4] thermal: Add new thermal trend type to support quick cooling

On 22 November 2012 13:42, Zhang Rui <rui.zhang@...el.com> wrote:
> On Thu, 2012-11-22 at 10:11 +0530, Amit Kachhap wrote:
>> On 22 November 2012 06:52, Zhang Rui <rui.zhang@...el.com> wrote:
>> > On Thu, 2012-11-08 at 09:56 +0530, Amit Daniel Kachhap wrote:
>> >> This modification adds 2 new thermal trend type THERMAL_TREND_RAISE_FULL
>> >> and THERMAL_TREND_DROP_FULL. This thermal trend can be used to quickly
>> >> jump to the upper or lower cooling level instead of incremental increase
>> >> or decrease. This is needed for temperature sensors which support rising/falling
>> >> threshold interrupts and polling can be totally avoided.
>> >>
>> >> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
>> >> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@...aro.org>
>> >> ---
>> >>  drivers/thermal/step_wise.c |   19 +++++++++++++++----
>> >>  include/linux/thermal.h     |    2 ++
>> >>  2 files changed, 17 insertions(+), 4 deletions(-)
>> >>
>> >> diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
>> >> index 1242cff..0d2d8d6 100644
>> >> --- a/drivers/thermal/step_wise.c
>> >> +++ b/drivers/thermal/step_wise.c
>> >> @@ -35,6 +35,10 @@
>> >>   *       state for this trip point
>> >>   *    b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
>> >>   *       state for this trip point
>> >> + *    c. if the trend is THERMAL_TREND_RAISE_FULL, use highest cooling
>> >> + *       state for this trip point
>> >> + *    d. if the trend is THERMAL_TREND_DROP_FULL, use lowest cooling
>> >> + *       state for this trip point
>> >>   */
>> >>  static unsigned long get_target_state(struct thermal_instance *instance,
>> >>                                       enum thermal_trend trend)
>> >> @@ -50,7 +54,10 @@ static unsigned long get_target_state(struct thermal_instance *instance,
>> >>       } else if (trend == THERMAL_TREND_DROPPING) {
>> >>               cur_state = cur_state > instance->lower ?
>> >>                           (cur_state - 1) : instance->lower;
>> >> -     }
>> >> +     } else if (trend == THERMAL_TREND_RAISE_FULL)
>> >> +             cur_state = instance->upper;
>> >> +     else if (trend == THERMAL_TREND_DROP_FULL)
>> >> +             cur_state = instance->lower;
>> >>
>> >>       return cur_state;
>> >>  }
>> >> @@ -87,7 +94,8 @@ static void update_instance_for_throttle(struct thermal_zone_device *tz,
>> >>  }
>> >>
>> >>  static void update_instance_for_dethrottle(struct thermal_zone_device *tz,
>> >> -                             int trip, enum thermal_trip_type trip_type)
>> >> +                             int trip, enum thermal_trip_type trip_type,
>> >> +                             enum thermal_trend trend)
>> >>  {
>> >>       struct thermal_instance *instance;
>> >>       struct thermal_cooling_device *cdev;
>> >> @@ -101,7 +109,10 @@ static void update_instance_for_dethrottle(struct thermal_zone_device *tz,
>> >>               cdev = instance->cdev;
>> >>               cdev->ops->get_cur_state(cdev, &cur_state);
>> >>
>> >> -             instance->target = cur_state > instance->lower ?
>> >> +             if (trend == THERMAL_TREND_DROP_FULL)
>> >> +                     instance->target = instance->lower;
>> >> +             else
>> >> +                     instance->target = cur_state > instance->lower ?
>> >>                           (cur_state - 1) : THERMAL_NO_TARGET;
>> >>
>> > what do you expect to happen if the trend is THERMAL_TREND_RAISE_FULL at
>> > this time?
>> >
>> Hi Rui,
>>
>> I suppose this is dethrotle routine and hence this will be called when
>> only drop in temperature happens. Also I did not used get_target_state
>> here because I thought it might cause regression in the other existing
>> thermal drivers(I am not sure) But I guess calling get_target_state is
>> the good way to know next target state and is fine if you agree.
>> Also one suggestion, 2 functions for throttle/dethrottle can be merged
>> as both look same and just get_target_state can be used in that
>> function
>>
> agree.
> patches have been refreshed, please review.

Thanks Rui, Your patches looks nice. I will re-base my patches against
your implementation and submit them shortly.

Thanks,
Amit D
>
> thanks,
> rui
>
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