diff --git a/arch/arm/mach-imx/mx6/soc.c b/arch/arm/mach-imx/mx6/soc.c
index e87a215..48eaa84 100644
--- a/arch/arm/mach-imx/mx6/soc.c
+++ b/arch/arm/mach-imx/mx6/soc.c
@@ -379,6 +379,8 @@
 
 int arch_cpu_init(void)
 {
+	struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
 	init_aips();
 
 	/* Need to clear MMDC_CHx_MASK to make warm reset work. */
@@ -448,6 +450,9 @@
 
 	imx_set_wdog_powerdown(false); /* Disable PDE bit of WMCR register */
 
+	if (is_mx6sx())
+		setbits_le32(&ccm->cscdr1, MXC_CCM_CSCDR1_UART_CLK_SEL);
+
 	init_src();
 
 	return 0;