S_000004_MC_FB_TOP  168 drivers/gpu/drm/radeon/r520d.h #define   S_000004_MC_FB_TOP(x)                        (((x) & 0xFFFF) << 16)
S_000004_MC_FB_TOP  512 drivers/gpu/drm/radeon/rs600d.h #define   S_000004_MC_FB_TOP(x)                        (((x) & 0xFFFF) << 16)