diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 05271ba..3b5742e 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -21,6 +21,8 @@
 
 struct mmc_ios {
 	unsigned int	clock;			/* clock rate */
+	unsigned int	old_rate;       /* saved clock rate */
+	unsigned long	clk_ts;         /* time stamp of last updated clock */
 	unsigned short	vdd;
 
 /* vdd stores the bit number of the selected voltage range from below. */