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thermal: ACPI: Invalidate trip points with temperature of 0 or below
It is reported that commit9502108876
("thermal: core: Drop trips_disabled bitmask") causes the maximum frequency of CPUs to drop further down with every system sleep-wake cycle on Intel Core i7-4710HQ. This turns out to be due to a trip point whose temperature is equal to 0 degrees Celsius which is acted on every time the system wakes from sleep. Before commit9502108876
this trip point would be disabled wia the trips_disabled bitmask, but now it is treated as a valid one. Since ACPI thermal control is generally about protection against overheating, trip points with temperature of 0 centigrade or below are not particularly useful there, so initialize them all as invalid which fixes the problem at hand. Fixes:9502108876
("thermal: core: Drop trips_disabled bitmask") Closes: https://lore.kernel.org/linux-pm/3f71747b-f852-4ee0-b384-cf46b2aefa3f@gmx.com Reported-by: Tibor Billes <tbilles@gmx.com> Tested-by: Tibor Billes <tbilles@gmx.com> Cc: 6.7+ <stable@vger.kernel.org> # 6.7+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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1 changed files with 7 additions and 1 deletions
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@ -168,11 +168,17 @@ static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
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static int acpi_thermal_temp(struct acpi_thermal *tz, int temp_deci_k)
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{
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int temp;
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if (temp_deci_k == THERMAL_TEMP_INVALID)
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return THERMAL_TEMP_INVALID;
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return deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
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temp = deci_kelvin_to_millicelsius_with_offset(temp_deci_k,
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tz->kelvin_offset);
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if (temp <= 0)
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return THERMAL_TEMP_INVALID;
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return temp;
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}
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static bool acpi_thermal_trip_valid(struct acpi_thermal_trip *acpi_trip)
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