Not knowing the year of your machine, it might not even have an idle control valve. If it is throttle by wire, a previous entry talked about the cause and what to do to avoid further high idle. To positively reset the idle on TBW, be sure the shutoff switch (on the right switch box) is ON. Don't touch the throttle and turn the master switch on and off 4 times allowing a few seconds between each cycle.
If you use the shutoff switch to shut down, it is very easy to roll the throttle slightly forward when reaching for the switch. That slightly forward position is stored as the normal idle. At the next start, the throttle is now at the "no hands" idle position which is now above the idle position at the last shutdown so the rpm is higher because the computer believes you have twisted the throttle above idle. Hope this isn't too confusing.
Any time you have a question about your machine, specifying the year and model will make the answers more applicable to your bike.