XDMA_DESC_BLOCK_NUM
#define XDMA_DESC_BLOCK_MASK (XDMA_DESC_BLOCK_NUM - 1)
if (complete_desc_num == XDMA_DESC_BLOCK_NUM * XDMA_DESC_ADJACENT) {
complete_desc_num != XDMA_DESC_BLOCK_NUM * XDMA_DESC_ADJACENT)