NHL's Jarret Stoll -- Charged with Coke Possession ... From Vegas Party Weekend

L.A. Kings star Jarret Stoll has been charged with cocaine possession ... stemming from a crazy party weekend in Las Vegas back in April ... TMZ Sports has learned.

As we previously reported, Stoll -- boyfriend of Erin Andrews -- was busted on April 17th for allegedly bringing cocaine and ecstasy to a Vegas pool party.

According to the criminal complaint filed today in Nevada ... Stoll will only be charged for the cocaine -- not the ecstasy.

If convicted, he faces up to 4 years in state prison.