step_name
const char *step_name = intel_step_name(INTEL_DISPLAY_STEP(display));
si->stepping = step_name[0];
si->substepping = step_name[1];
step_prefix(param->step.graphics), step_name(param->step.graphics),
step_prefix(param->step.media), step_name(param->step.media),
step_prefix(param->step.graphics), step_name(param->step.graphics),