drm_panel_dp_aux_backlight
EXPORT_SYMBOL(drm_panel_dp_aux_backlight);
err = drm_panel_dp_aux_backlight(&panel->base, panel->aux);
ret = drm_panel_dp_aux_backlight(&panel->base, aux_ep->aux);
int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux);