SDMA_H_CONFIG
writel_relaxed(SDMA_H_CONFIG_ACR, sdma->regs + SDMA_H_CONFIG);
writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
reg = readl(sdma->regs + SDMA_H_CONFIG);
writel_relaxed(reg, sdma->regs + SDMA_H_CONFIG);