drm/radeon: change vblank_time's calculation method to reduce computational error.
BugLink: http://bugs.launchpad.net/bugs/1638267 commit 02cfb5fc upstream. Ported from Rex's amdgpu change. Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
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