INTEL_DISPLAY_STEP
(drm_WARN_ON((__display)->drm, INTEL_DISPLAY_STEP(__display) == STEP_NONE), \
INTEL_DISPLAY_STEP(__display) >= (since) && INTEL_DISPLAY_STEP(__display) < (until))
const char *step_name = intel_step_name(INTEL_DISPLAY_STEP(display));