linux-kernel - Re: [PATCH 2/3] thermal/drivers/intel: Use generic trip points for processor_thermal_device

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Date:   Mon, 23 Jan 2023 19:02:31 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>,
        rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rui.zhang@...el.com, Amit Kucheria <amitk@...nel.org>,
        Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>,
        Shang XiaoJing <shangxiaojing@...wei.com>
Subject: Re: [PATCH 2/3] thermal/drivers/intel: Use generic trip points for
 processor_thermal_device_pci


Hi Srinivas,


On 18/01/2023 20:09, srinivas pandruvada wrote:
> On Wed, 2023-01-18 at 19:16 +0100, Daniel Lezcano wrote:
>> 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.
>>
> In this scheme is the assumption is that trip point temperature never
> changes? If firmware updated the trip temperature, what needs to be
> done?

I'm a bit confused about the situation where the firmware can change the 
trip point in the back of the OSPM.

Does the firmware send a notification about the trip change? Or does it 
assume the OSPM will be reading the trip point while monitoring/polling 
the thermal zone ?

Is the question for this particular driver?

If the trip point is changed by the userspace (via sysfs), 
thermal_zone_set_trip() is used which in turn changes the thermal trip 
temperature directly in the generic structure and then calls the back 
set_trip_temp.


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