If you mean a prolonged fast idle, perfectly normal. Idle speed is tied into the HVAC, ambient temp, coolant temp, air intake/MAF temp and EGR routines. Depending on conditions, idle can be anywhere from 1100 to 900rpm upon cold startup.
What isn't normal is is sluggish, lumpy starting, misfiring and rough running from cold.
Ignore the idle speed. If it's smooth and drivable, it's doing what it's programmed to