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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measurement register is no longer valid, until the next time the chip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>
wifi-calibration
Jean Delvare 2007-06-24 11:19:01 +02:00 committed by Mark M. Hoffman
parent 475ef85512
commit 6b3e464580
1 changed files with 3 additions and 1 deletions
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4
drivers/hwmon/w83627ehf.c
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@ -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]);