From 6b3e46458049fe556c2346a347c4540e532db288 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sun, 24 Jun 2007 11:19:01 +0200 Subject: 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 * When changing a fan clock divider, the corresponding fan speed measurement register is no longer valid, until the next time the chip will refresh it.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 Signed-off-by: Mark M. Hoffman --- drivers/hwmon/w83627ehf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/hwmon/w83627ehf.c') diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c index e615b8378fc3..0c2d929cf573 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]); -- cgit v1.2.3