RING_ERR
if (readl_relaxed(ad->base + REG_DESC_RING(channo)) & RING_ERR) {
writel_relaxed(RING_ERR, ad->base + REG_DESC_RING(channo));
if (readl_relaxed(ad->base + REG_REPORT_RING(channo)) & RING_ERR) {
writel_relaxed(RING_ERR, ad->base + REG_REPORT_RING(channo));