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authorlan,Tianyu <tianyu.lan@intel.com>2014-04-03 10:04:15 +0400
committerZhang Rui <rui.zhang@intel.com>2014-05-15 12:38:48 +0400
commitced2284339580b50b997807d02ccee19692b72b3 (patch)
tree013dac8a505e5def6b78c61a38f629ae8d89d332 /drivers/thermal
parentd6d211db37e75de2ddc3a4f979038c40df7cc79c (diff)
downloadlinux-ced2284339580b50b997807d02ccee19692b72b3.tar.xz
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>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/int3403_thermal.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/thermal/int3403_thermal.c b/drivers/thermal/int3403_thermal.c
index 1301681d9a77..e93f0253f6ed 100644
--- a/drivers/thermal/int3403_thermal.c
+++ b/drivers/thermal/int3403_thermal.c
@@ -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;
}