linux-kernel - Re: [PATCH 3/3] thermal/drivers/intel: Use generic trip points int340x

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Date:   Fri, 13 Jan 2023 13:12:47 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Zhang, Rui" <rui.zhang@...el.com>,
        "rafael@...nel.org" <rafael@...nel.org>
Cc:     "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "daniel.lezcano@...nel.org" <daniel.lezcano@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "christophe.jaillet@...adoo.fr" <christophe.jaillet@...adoo.fr>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "amitk@...nel.org" <amitk@...nel.org>
Subject: Re: [PATCH 3/3] thermal/drivers/intel: Use generic trip points
 int340x


Hi Rui;

thanks for testing and your comments


On 13/01/2023 12:41, Zhang, Rui wrote:
> On Tue, 2023-01-10 at 16:17 +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 the ops content logic into generic trip points and register
>> them with the thermal zone.
>>
>> In order to consolidate the code, use the ACPI thermal framework API
>> to fill the generic trip point from the ACPI tables.
>>
>> It has been tested on a Intel i7-8650U - x280 with the INT3400, the
>> PCH, ACPITZ, and x86_pkg_temp. No regression observed so far.
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...nel.org>
>> ---
>>     V3:
>>        - The driver Kconfig option selects CONFIG_THERMAL_ACPI
>>        - Change the initialization to use GTSH for the hysteresis on
>>          all the trip points
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
>> ---
>>   drivers/thermal/intel/int340x_thermal/Kconfig |   1 +
>>   .../int340x_thermal/int340x_thermal_zone.c    | 177 ++++----------
>> ----

[ ... ]

>> -static int int340x_thermal_get_trip_hyst(struct thermal_zone_device
>> *zone,
>> -		int trip, int *temp)
>> -{
>> -	struct int34x_thermal_zone *d = zone->devdata;
>> -	acpi_status status;
>> -	unsigned long long hyst;
>> -
>> -	status = acpi_evaluate_integer(d->adev->handle, "GTSH", NULL,
>> &hyst);
>> -	if (ACPI_FAILURE(status))
>> -		*temp = 0;
>> -	else
>> -		*temp = hyst * 100;
> 
> The previous code returns hyst * 100.
> But the new API retuurns hyst directly.
> 
> -/sys/class/thermal/thermal_zone2/trip_point_4_hyst:2000
> +/sys/class/the
> rmal/thermal_zone2/trip_point_4_hyst:20
> 
> Is this done on purpose?

No, it is an error. The function thermal_acpi_trip_gtsh() should do:

	return deci_kelvin_to_millicelsius(hyst);




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