hwmon: (it87) Validate auto pwm settings
Before switching to automatic fan control mode, make sure that all the
trip points make sense. Otherwise, the control loop could lead to
weird fan behavior.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index 0083bd3..8d08bf0 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -177,3 +177,7 @@
the one of trip point N. The automatic control mode is less flexible
than the manual control mode, but it reacts faster, is more robust and
doesn't use CPU cycles.
+
+Trip points must be set properly before switching to automatic fan speed
+control mode. The driver will perform basic integrity checks before
+actually switching to automatic control mode.