MTK_HSDMA_RX_CPU
mtk_dma_write(hsdma, MTK_HSDMA_RX_CPU, ring->cur_rptr);
mtk_dma_write(hsdma, MTK_HSDMA_RX_CPU, MTK_DMA_SIZE - 1);
mtk_dma_write(hsdma, MTK_HSDMA_RX_CPU, pc->ring.cur_rptr);