The Commanders and Davis agreed to terms on a contract Monday, Kris Rhim of ESPN.com reports.
Davis compiled 62 tackles (52 solo), 10 passes defensed and one interception in 17 games with the Chargers during the 2023 season.
Davis recorded six tackles, including a tackle for a loss, and two passes defensed in the Chargers' 63-21 defeat to the Raiders on Thursday.
Davis recorded eight tackles (all solo) in Sunday's 24-17 win over Las Vegas.
Davis sustained a pectoral injury during Saturday's wild-card contest in Jacksonville.
Davis (knee) is listed as active for Sunday's game against the Cardinals.
Davis (knee) is listed as questionable to play Sunday against the Cardinals, Jeff Miller of the Los Angeles Times reports.
Davis is expected to step in as one of the Chargers' starting cornerbacks in place of J.C. Jackson (kneecap) this season, Lindsey Thiry of ESPN.com reports.
Davis appears to have overtaken Asante Samuel for the starting outside corner role opposite J.C. Jackson, Daniel Popper of The Athletic reports.
Davis (illness) was activated from the reserve/COVID-19 list Thursday, Jeff Miller of the Los Angeles Times reports.