dispc_ovl_calc_scaling
r = dispc_ovl_calc_scaling(dispc, plane, pclk, lclk, caps, vm, in_width,
return dispc_ovl_calc_scaling(pclk, lclk, caps, timings, in_width,
r = dispc_ovl_calc_scaling(pclk, lclk, caps, mgr_timings, in_width,