drm/radeon/kms: add info query for backend map

The 3D driver need to get the pipe to backend
map to certain things.  Add a query to get the
info.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index bc54b26cb32f..9fefce704f96 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1662,6 +1662,7 @@ void r600_gpu_init(struct radeon_device *rdev)
                                                                                R6XX_MAX_BACKENDS_MASK) >> 16)),
                                                         (cc_rb_backend_disable >> 16));
         rdev->config.r600.tile_config = tiling_config;
+        rdev->config.r600.backend_map = backend_map;
         tiling_config |= BACKEND_MAP(backend_map);
         WREG32(GB_TILING_CONFIG, tiling_config);
         WREG32(DCP_TILING_CONFIG, tiling_config & 0xffff);