linux-kernel - Re: [PATCH 3/3] thermal/drivers/intel: Use generic trip points for intel_soc_dts

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Date:   Tue, 24 Jan 2023 11:28:45 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     srinivas.pandruvada@...ux.intel.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, rui.zhang@...el.com,
        Daniel Lezcano <daniel.lezcano@...nel.org>,
        Amit Kucheria <amitk@...nel.org>
Subject: Re: [PATCH 3/3] thermal/drivers/intel: Use generic trip points for
 intel_soc_dts_iosf

On 23/01/2023 21:19, Rafael J. Wysocki wrote:
> On Mon, Jan 23, 2023 at 7:09 PM Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
>>
>>
>> Hi Srinivas,
>>
>> On 19/01/2023 21:04, Rafael J. Wysocki wrote:
>>> On Wed, Jan 18, 2023 at 7:16 PM Daniel Lezcano
>>> <daniel.lezcano@...aro.org> wrote:
>>>>
>>>> From: Daniel Lezcano <daniel.lezcano@...nel.org>
>>>>
>>>> The thermal framework gives the possibility to register the trip
>>>> points with the thermal zone. When that is done, no get_trip_* ops are
>>>> needed and they can be removed.
>>>>
>>>> Convert ops content logic into generic trip points and register them with the
>>>> thermal zone.
>>>>
>>>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>>>> ---
>>
>> [ ... ]
>>
>>>>
>>>> @@ -320,7 +304,8 @@ static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
>>>>           dts->trip_mask = trip_mask;
>>>>           dts->trip_count = trip_count;
>>>>           snprintf(name, sizeof(name), "soc_dts%d", id);
>>>> -       dts->tzone = thermal_zone_device_register(name,
>>>> +       dts->tzone = thermal_zone_device_register_with_trips(name,
>>>> +                                                 dts->trips,
>>>>                                                     trip_count,
>>>>                                                     trip_mask,
>>>>                                                     dts, &tzone_ops,
>>>> @@ -430,27 +415,28 @@ struct intel_soc_dts_sensors *intel_soc_dts_iosf_init(
>>>>                   notification = false;
>>>>           else
>>>>                   notification = true;
>>>> -       for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
>>>> -               sensors->soc_dts[i].sensors = sensors;
>>>> -               ret = add_dts_thermal_zone(i, &sensors->soc_dts[i],
>>>> -                                          notification, trip_count,
>>>> -                                          read_only_trip_count);
>>>> -               if (ret)
>>>> -                       goto err_free;
>>>> -       }
>>>
>>> How is this change related to the rest of the patch?
>>
>> We want to register the thermal zone with the trip points.
>>
>> thermal_zone_device_register() becomes
>>
>> thermal_zone_device_register_with_trips()
>>
>> But in the current code, the trip points are updated after the thermal
>> zones are created (and strictly speaking it is wrong as get_trip_temp
>> can be invoked before the trip points are updated).
>>
>> So the change inverts the initialization where we update the trip points
>> and then we register the thermal zones.
> 
> It would be nice to write this in the changelog too.

Srinivasn, are you fine with the changes ?

Rafael, if the patches are ok, shall I resend a new version with the 
changelog updated or can you pick them amending the changelog ?



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