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authorJean Delvare <khali@linux-fr.org>2007-06-24 11:19:01 +0200
committerMark M. Hoffman <mhoffman@lightlink.com>2007-07-19 14:22:17 -0400
commit6b3e46458049fe556c2346a347c4540e532db288 (patch)
treee5acce165cd5df721285f6046f2af5fda7739fd9 /drivers/hwmon
parent475ef85512900dcb87435e13656c1f5e724de379 (diff)
hwmon/w83627ehf: Fix timing issues
* I have experimental evidence that the W83627EHG needs more than 1 second to refresh all the measured values. Increase the caching time to 1.5 second. * When changing a fan clock divider, the corresponding fan speed measurement register is no longer valid, until the next time the chip will refresh it. One way to fix this is to pretend that the cache is still valid for one more period (1.5 second.) Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/w83627ehf.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index e615b8378fc..0c2d929cf57 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -421,7 +421,7 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
mutex_lock(&data->update_lock);
- if (time_after(jiffies, data->last_updated + HZ)
+ if (time_after(jiffies, data->last_updated + HZ + HZ/2)
|| !data->valid) {
/* Fan clock dividers */
i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV1);
@@ -727,6 +727,8 @@ store_fan_min(struct device *dev, struct device_attribute *attr,
div_from_reg(new_div));
data->fan_div[nr] = new_div;
w83627ehf_write_fan_div(data, nr);
+ /* Give the chip time to sample a new speed value */
+ data->last_updated = jiffies;
}
w83627ehf_write_value(data, W83627EHF_REG_FAN_MIN[nr],
data->fan_min[nr]);