A patch referencing this bug report has been merged in Linux v3.7-rc5:

commit 695ddeb457584a602f2ba117d08ce37cf6ec1589
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Mon Nov 5 16:34:58 2012 +0000

    drm/radeon: fix typo in evergreen_mc_resume()