drm_rect_calc_hscale
hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
EXPORT_SYMBOL(drm_rect_calc_hscale);
hscale = drm_rect_calc_hscale(&plane_state->base.src,
int drm_rect_calc_hscale(const struct drm_rect *src,