drm_sysfb_get_visible_size_si
u64 drm_sysfb_get_visible_size_si(struct drm_device *dev, const struct screen_info *si,
EXPORT_SYMBOL(drm_sysfb_get_visible_size_si);
vsize = drm_sysfb_get_visible_size_si(dev, si, height, stride, resource_size(res));
vsize = drm_sysfb_get_visible_size_si(dev, si, height, stride, resource_size(res));