therm_adt746x: Always clear hardware bit which inverts fan speed range.

This bit would get enabled sometimes (probably after suspend/resume), so the
fan would run at full speed below the temperature thresholds, but slow down and
eventually stop if temperatures rose above the thresholds... not exactly what
you want.

Signed-off-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index c0621d50c8a0..0ddf9044948a 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -37,6 +37,7 @@
 #define CONFIG_REG   0x40
 #define MANUAL_MASK  0xe0
 #define AUTO_MASK    0x20
+#define INVERT_MASK  0x10
 
 static u8 TEMP_REG[3]    = {0x26, 0x25, 0x27}; /* local, sensor1, sensor2 */
 static u8 LIMIT_REG[3]   = {0x6b, 0x6a, 0x6c}; /* local, sensor1, sensor2 */
@@ -229,7 +230,8 @@ static void write_fan_speed(struct thermostat *th, int speed, int fan)
         
         if (speed >= 0) {
                 manual = read_reg(th, MANUAL_MODE[fan]);
-                write_reg(th, MANUAL_MODE[fan], manual|MANUAL_MASK);
+                write_reg(th, MANUAL_MODE[fan],
+                        (manual|MANUAL_MASK) & (~INVERT_MASK));
                 write_reg(th, FAN_SPD_SET[fan], speed);
         } else {
                 /* back to automatic */