TM_CFG
dev_dbg(dev, ": TM_CFG: %x", readl(acdev->vbase + TM_CFG));
val = readl(acdev->vbase + TM_CFG) & ~TRUEIDE_PIO_TIMING_MASK;
writel(val, acdev->vbase + TM_CFG);
tmcfg = readl(acdev->vbase + TM_CFG);
writel(tmcfg, acdev->vbase + TM_CFG);