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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

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