thermal: armada: Update Armada 380 thermal sensor coefficients

[ Upstream commit efa86858e1d8970411a140fa1e0c4dd18a8f2a89 ]

Improve the Armada 380 thermal sensor accuracy by using updated formula.
The updated formula is:
Temperature[C degrees] = 0.4761 * tsen_vsen_out - 279.1

Signed-off-by: Nadav Haklai <nadavh@marvell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: <stable@vger.kernel.org> #v3.16
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
index 9d1420acb391b0967ddb60db3c6daae940d908df..e6f1acc719962658acc131accda7226e2f51acba 100644 (file)
--- a/drivers/thermal/armada_thermal.c
+++ b/drivers/thermal/armada_thermal.c
@@ -240,9 +240,9 @@ static const struct armada_thermal_data armada380_data = {
        .is_valid_shift = 10,
        .temp_shift = 0,
        .temp_mask = 0x3ff,
-       .coef_b = 1169498786UL,
-       .coef_m = 2000000UL,
-       .coef_div = 4289,
+       .coef_b = 2931108200UL,
+       .coef_m = 5000000UL,
+       .coef_div = 10502,
        .inverted = true,
 };