Commit ced22843 authored Apr 03, 2014 by lan,Tianyu Committed by Zhang Rui May 15, 2014

Thermal/int3403: Fix thermal hysteresis unit conversion



Thermal hysteresis represents a temperature difference.
But the original code treats it as a temperature value,
Convert it from tenths of degree Kelvin to Milli-Celsius
by deducing 273200. This is not right.

Kelvin and Celsius have same degree size. From temperature
difference view, the conversion between tenths of degree
Kelvin unit and Milli-Celsius unit is just to multiply 100.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

parent d6d211db

drivers/thermal/int3403_thermal.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -62,7 +62,13 @@ static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
		if (ACPI_FAILURE(status))
		return -EIO;

		*temp = DECI_KELVIN_TO_MILLI_CELSIUS(hyst, KELVIN_OFFSET);
		/*
		* Thermal hysteresis represents a temperature difference.
		* Kelvin and Celsius have same degree size. So the
		* conversion here between tenths of degree Kelvin unit
		* and Milli-Celsius unit is just to multiply 100.
		*/
		temp = hyst 100;

		return 0;
		}