diff --git a/libubb/mmcclk.c b/libubb/mmcclk.c
index 42202d7..80c4ca1 100644
--- a/libubb/mmcclk.c
+++ b/libubb/mmcclk.c
@@ -60,6 +60,10 @@ void mmcclk_start(struct mmcclk *dsc)
 {
 	MSCCDR = dsc->clkdiv;	/* set controller clock */
 	CLKGR &= ~(1 << 7);	/* enable MSC clock */
+
+	MSC_STRPCL = 1 << 3;    /* reset the MSC */
+	while (MSC_STAT & (1 << 15));	/* wait until reset finishes */
+
 	MSC_CLKRT = dsc->clkrt;	/* set bus clock */
 	MSC_STRPCL = 2;		/* start MMC bus clock output */
 }