si_get_maximum_link_speed
enum si_pcie_gen target_link_speed = si_get_maximum_link_speed(adev, amdgpu_new_state);
current_link_speed = si_get_maximum_link_speed(adev, amdgpu_current_state);
enum si_pcie_gen target_link_speed = si_get_maximum_link_speed(adev, amdgpu_new_state);
enum radeon_pcie_gen target_link_speed = si_get_maximum_link_speed(rdev, radeon_new_state);
current_link_speed = si_get_maximum_link_speed(rdev, radeon_current_state);
enum radeon_pcie_gen target_link_speed = si_get_maximum_link_speed(rdev, radeon_new_state);