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Diffstat (limited to 'drivers/hwmon/w83627ehf.c')
-rw-r--r--drivers/hwmon/w83627ehf.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index 30a76404f0af..f4d850c71585 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -716,10 +716,15 @@ store_fan_min(struct device *dev, struct device_attribute *attr,
/* Write both the fan clock divider (if it changed) and the new
fan min (unconditionally) */
if (new_div != data->fan_div[nr]) {
- if (new_div > data->fan_div[nr])
- data->fan[nr] >>= (data->fan_div[nr] - new_div);
- else
- data->fan[nr] <<= (new_div - data->fan_div[nr]);
+ /* Preserve the fan speed reading */
+ if (data->fan[nr] != 0xff) {
+ if (new_div > data->fan_div[nr])
+ data->fan[nr] >>= new_div - data->fan_div[nr];
+ else if (data->fan[nr] & 0x80)
+ data->fan[nr] = 0xff;
+ else
+ data->fan[nr] <<= data->fan_div[nr] - new_div;
+ }
dev_dbg(dev, "fan%u clock divider changed from %u to %u\n",
nr + 1, div_from_reg(data->fan_div[nr]),
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