SU_SCLK_USE_BCLK  845 drivers/gpu/drm/radeon/r100d.h #define   SU_SCLK_USE_BCLK                             (1 << 17)
SU_SCLK_USE_BCLK 1311 drivers/gpu/drm/radeon/r600d.h #       define SU_SCLK_USE_BCLK                           (1 << 3)