diff --git a/arch/arm/mach-omap2/mcbsp.c b/arch/arm/mach-omap2/mcbsp.c
index eba9fa1..f6b772e 100644
--- a/arch/arm/mach-omap2/mcbsp.c
+++ b/arch/arm/mach-omap2/mcbsp.c
@@ -34,7 +34,7 @@
 
 	v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
 	if (mux == CLKR_SRC_CLKR)
-		v &= OMAP2_MCBSP1_CLKR_MASK;
+		v &= ~OMAP2_MCBSP1_CLKR_MASK;
 	else if (mux == CLKR_SRC_CLKX)
 		v |= OMAP2_MCBSP1_CLKR_MASK;
 	omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
@@ -47,7 +47,7 @@
 
 	v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
 	if (mux == FSR_SRC_FSR)
-		v &= OMAP2_MCBSP1_FSR_MASK;
+		v &= ~OMAP2_MCBSP1_FSR_MASK;
 	else if (mux == FSR_SRC_FSX)
 		v |= OMAP2_MCBSP1_FSR_MASK;
 	omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);