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Message-Id: <1396505055-581-1-git-send-email-tianyu.lan@intel.com> Date: Thu, 3 Apr 2014 14:04:15 +0800 From: Lan Tianyu <tianyu.lan@...el.com> To: rui.zhang@...el.com, eduardo.valentin@...com, srinivas.pandruvada@...ux.intel.com Cc: Lan Tianyu <tianyu.lan@...el.com>, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] 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@...el.com> Acked-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com> --- drivers/thermal/int3403_thermal.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/int3403_thermal.c b/drivers/thermal/int3403_thermal.c index 1301681..e93f025 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; } -- 1.8.4.rc0.1.g8f6a3e5.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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