drm/radeon/kms: add backend map workaround for barts

Same as Cypress.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2011-01-06 21:19:25 -05:00 • committed by Dave Airlie
commit 03f4009055