RGA_CMDBUF_SIZE
memset(rga->cmdbuf_virt, 0, RGA_CMDBUF_SIZE * 4);
rga->cmdbuf_virt = dma_alloc_attrs(rga->dev, RGA_CMDBUF_SIZE,
dma_free_attrs(rga->dev, RGA_CMDBUF_SIZE, rga->cmdbuf_virt,
dma_free_attrs(rga->dev, RGA_CMDBUF_SIZE, rga->cmdbuf_virt,