PCH_UDC_BS_HST_BSY
td->status = PCH_UDC_BS_HST_BSY;
td->status = PCH_UDC_BS_HST_BSY | min(buf_len, bytes);
dma_desc->status |= PCH_UDC_BS_HST_BSY;
req->td_data_last->status = PCH_UDC_BS_HST_BSY | PCH_UDC_DMA_LAST;
req->td_data->status = PCH_UDC_BS_HST_BSY | PCH_UDC_DMA_LAST;
td->status |= PCH_UDC_BS_HST_BSY;