DMA_MIN_COOKIE
chan->cookie = DMA_MIN_COOKIE;
chan->completed_cookie = DMA_MIN_COOKIE;
if (cookie < DMA_MIN_COOKIE)
cookie = DMA_MIN_COOKIE;
BUG_ON(tx->cookie < DMA_MIN_COOKIE);
usdhi6_dma_start(host) >= DMA_MIN_COOKIE;