mtk_qdma_phys_to_virt
txd = mtk_qdma_phys_to_virt(ring, txd->txd2);
ring->next_free = mtk_qdma_phys_to_virt(ring, txd->txd2);
itxd = mtk_qdma_phys_to_virt(ring, itxd->txd2);
txd = mtk_qdma_phys_to_virt(ring, txd->txd2);
ring->next_free = mtk_qdma_phys_to_virt(ring, txd->txd2);
htxd = mtk_qdma_phys_to_virt(ring, htxd->txd2);
desc = mtk_qdma_phys_to_virt(ring, cpu);
desc = mtk_qdma_phys_to_virt(ring, desc->txd2);