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SubjectRe: [PATCH 1/4] thermal: Add a new trip type to use cooling device instance number
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On 23 February 2012 12:16, R, Durgadoss <durgadoss.r@intel.com> wrote:
> Hi Amit,
>
>> -----Original Message-----
>> From: amit kachhap [mailto:amitdanielk@gmail.com] On Behalf Of Amit Daniel
>> Kachhap
>> Sent: Wednesday, February 22, 2012 3:44 PM
>> To: linux-pm@lists.linux-foundation.org
>> Cc: linux-kernel@vger.kernel.org; mjg59@srcf.ucam.org; linux-
>> acpi@vger.kernel.org; lenb@kernel.org; linaro-dev@lists.linaro.org;
>> amit.kachhap@linaro.org; R, Durgadoss; rob.lee@linaro.org; patches@linaro.org
>> Subject: [PATCH 1/4] thermal: Add a new trip type to use cooling device
>> instance number
>>
>> This patch adds a new trip type THERMAL_TRIP_STATE_ACTIVE. This
>> trip behaves same as THERMAL_TRIP_ACTIVE but also passes the cooling
>> device instance number. This helps the cooling device registered as
>> different instances to perform appropriate cooling action decision in
>> the set_cur_state call back function.
>>
>> Also since the trip temperature's are in ascending order so some logic
>> is put in place to skip the un-necessary checks.
>>
>> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@linaro.org>
>> ---
>>  Documentation/thermal/sysfs-api.txt |    4 +-
>>  drivers/thermal/thermal_sys.c       |   45 ++++++++++++++++++++++++++++++++--
>>  include/linux/thermal.h             |    1 +
>>  3 files changed, 45 insertions(+), 5 deletions(-)
>>
>> diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-
>> api.txt
>> index 1733ab9..7a0c080 100644
>> --- a/Documentation/thermal/sysfs-api.txt
>> +++ b/Documentation/thermal/sysfs-api.txt
>> @@ -184,8 +184,8 @@ trip_point_[0-*]_temp
>>
>>  trip_point_[0-*]_type
>>       Strings which indicate the type of the trip point.
>> -     E.g. it can be one of critical, hot, passive, active[0-*] for ACPI
>> -     thermal zone.
>> +     E.g. it can be one of critical, hot, passive, active[0-1],
>> +     state-active[0-*] for ACPI thermal zone.
>>       RO, Optional
>>
>>  cdev[0-*]
>> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
>> index 220ce7e..d4c9b20 100644
>> --- a/drivers/thermal/thermal_sys.c
>> +++ b/drivers/thermal/thermal_sys.c
>> @@ -192,6 +192,8 @@ trip_point_type_show(struct device *dev, struct
>> device_attribute *attr,
>>               return sprintf(buf, "passive\n");
>>       case THERMAL_TRIP_ACTIVE:
>>               return sprintf(buf, "active\n");
>> +     case THERMAL_TRIP_STATE_ACTIVE:
>> +             return sprintf(buf, "state-active\n");
>>       default:
>>               return sprintf(buf, "unknown\n");
>>       }
>> @@ -1034,10 +1036,10 @@ EXPORT_SYMBOL(thermal_cooling_device_unregister);
>>
>>  void thermal_zone_device_update(struct thermal_zone_device *tz)
>>  {
>> -     int count, ret = 0;
>> -     long temp, trip_temp;
>> +     int count, ret = 0, inst_id;
>> +     long temp, trip_temp, max_state, last_trip_change = 0;
>>       enum thermal_trip_type trip_type;
>> -     struct thermal_cooling_device_instance *instance;
>> +     struct thermal_cooling_device_instance *instance, *state_instance;
>>       struct thermal_cooling_device *cdev;
>>
>>       mutex_lock(&tz->lock);
>> @@ -1086,6 +1088,43 @@ void thermal_zone_device_update(struct
>> thermal_zone_device *tz)
>>                                       cdev->ops->set_cur_state(cdev, 0);
>>                       }
>>                       break;
>> +             case THERMAL_TRIP_STATE_ACTIVE:
>> +                     list_for_each_entry(instance, &tz->cooling_devices,
>> +                                         node) {
>> +                             if (instance->trip != count)
>> +                                     continue;
>> +
>> +                             if (temp <= last_trip_change)
>> +                                     continue;
>> +
>> +                             inst_id = 0;
>> +                             /*
>> +                             *For this instance how many instance of same
>> +                             *cooling device occured before
>> +                             */
>> +
>> +                             list_for_each_entry(state_instance,
>> +                                             &tz->cooling_devices, node) {
>> +                                     if (instance->cdev ==
>> +                                                     state_instance->cdev)
>> +                                             inst_id++;
>> +                                     if (state_instance->trip == count)
>> +                                             break;
>> +                             }
>
> Can you explain a bit more on this loop and the set_cur_state below ?
> Sorry, I don't get the logic behind this..

This loop is basically finding the instance id of the same cooling device.
Say we have done like this,
thermal_zone_bind_cooling_device(thermal, 2, cdev);
thermal_zone_bind_cooling_device(thermal, 3, cdev);
thermal_zone_bind_cooling_device(thermal, 4, cdev);

In above same cooling device cdev is binded to trip no 2,3 and 4 with
inst_id generated as 1,2,3 respectively. so set_cur_state for those
trip reached will be called as,
set_cur_state(cdev, 1);
set_cur_state(cdev, 2);
set_cur_state(cdev, 3);

Thanks,
Amit D

>
> Thanks,
> Durga
>
>> +
>> +                             cdev = instance->cdev;
>> +                             cdev->ops->get_max_state(cdev, &max_state);
>> +
>> +                             if ((temp >= trip_temp) &&
>> +                                             (inst_id <= max_state))
>> +                                     cdev->ops->set_cur_state(cdev, inst_id);
>> +                             else if ((temp < trip_temp) &&
>> +                                             (--inst_id <= max_state))
>> +                                     cdev->ops->set_cur_state(cdev, inst_id);
>> +
>> +                             last_trip_change = trip_temp;
>> +                     }
>> +                     break;
>>               case THERMAL_TRIP_PASSIVE:
>>                       if (temp >= trip_temp || tz->passive)
>>                               thermal_zone_device_passive(tz, temp,
>> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
>> index 796f1ff..8df901f 100644
>> --- a/include/linux/thermal.h
>> +++ b/include/linux/thermal.h
>> @@ -42,6 +42,7 @@ enum thermal_trip_type {
>>       THERMAL_TRIP_PASSIVE,
>>       THERMAL_TRIP_HOT,
>>       THERMAL_TRIP_CRITICAL,
>> +     THERMAL_TRIP_STATE_ACTIVE,
>>  };
>>
>>  struct thermal_zone_device_ops {
>> --
>> 1.7.1
>
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