HISI_I2C_FIFO_CTRL
reg = readl(ctlr->iobase + HISI_I2C_FIFO_CTRL);
writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);
writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);
writel(reg, ctlr->iobase + HISI_I2C_FIFO_CTRL);