MCH_PRD_LEN_SHIFT
u32 flags = (tei->n_elem << MCH_PRD_LEN_SHIFT);
flags = (MVS_CHIP_DISP->prd_count() << MCH_PRD_LEN_SHIFT);
flags = (tei->n_elem << MCH_PRD_LEN_SHIFT);
hdr->flags = cpu_to_le32(flags | (tei->n_elem << MCH_PRD_LEN_SHIFT));