diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
index 0d31435b333cf738eec2de726404bfde343c434d..645b98c187c2056789f52904211ec300d3477142 100644
--- a/drivers/hwmon/lm85.c
+++ b/drivers/hwmon/lm85.c
@@ -308,10 +308,8 @@ struct lm85_data {
 	u8 pwm[3];		/* Register value */
 	u8 temp_ext[3];		/* Decoded values */
 	u8 in_ext[8];		/* Decoded values */
-	u8 smooth[1];		/* Register encoding */
 	u8 vid;			/* Register value */
 	u8 vrm;			/* VRM version */
-	u8 syncpwm3;		/* Saved PWM3 for TACH 2,3,4 config */
 	u32 alarms;		/* Register encoding, combined */
 	struct lm85_autofan autofan[3];
 	struct lm85_zone zone[3];
@@ -756,14 +754,15 @@ static ssize_t set_pwm_auto_pwm_minctl(struct device *dev,
 	struct i2c_client *client = to_i2c_client(dev);
 	struct lm85_data *data = i2c_get_clientdata(client);
 	long val = simple_strtol(buf, NULL, 10);
+	u8 tmp;
 
 	mutex_lock(&data->update_lock);
 	data->autofan[nr].min_off = val;
-	lm85_write_value(client, LM85_REG_AFAN_SPIKE1, data->smooth[0]
-		| data->syncpwm3
-		| (data->autofan[0].min_off ? 0x20 : 0)
-		| (data->autofan[1].min_off ? 0x40 : 0)
-		| (data->autofan[2].min_off ? 0x80 : 0));
+	tmp = lm85_read_value(client, LM85_REG_AFAN_SPIKE1);
+	tmp &= ~(0x20 << nr);
+	if (data->autofan[nr].min_off)
+		tmp |= 0x20 << nr;
+	lm85_write_value(client, LM85_REG_AFAN_SPIKE1, tmp);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -1531,8 +1530,6 @@ static struct lm85_data *lm85_update_device(struct device *dev)
 		}
 
 		i = lm85_read_value(client, LM85_REG_AFAN_SPIKE1);
-		data->smooth[0] = i & 0x0f;
-		data->syncpwm3 = i & 0x10;  /* Save PWM3 config */
 		data->autofan[0].min_off = (i & 0x20) != 0;
 		data->autofan[1].min_off = (i & 0x40) != 0;
 		data->autofan[2].min_off = (i & 0x80) != 0;