rv770_map_clkf_to_ibias
ibias = rv770_map_clkf_to_ibias(rdev, dividers.whole_fb_div);
ibias = rv770_map_clkf_to_ibias(rdev, clkf);
ibias = rv770_map_clkf_to_ibias(rdev, clkf);
u32 rv770_map_clkf_to_ibias(struct radeon_device *rdev, u32 clkf);