diff --git a/arch/powerpc/sysdev/cpm1.c b/arch/powerpc/sysdev/cpm1.c
index 4dae3698bf24..8d103ca6d6ab 100644
--- a/arch/powerpc/sysdev/cpm1.c
+++ b/arch/powerpc/sysdev/cpm1.c
@@ -486,9 +486,6 @@ int cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
 		return -EINVAL;
 	}
 
-	if (reg == &mpc8xx_immr->im_cpm.cp_sicr && mode == CPM_CLK_RX)
-		shift += 3;
-
 	for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 		if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 			bits = clk_map[i][2];
@@ -503,6 +500,17 @@ int cpm1_clk_setup(enum cpm_clk_target target, int clock, int mode)
 
 	bits <<= shift;
 	mask <<= shift;
+
+	if (reg == &mpc8xx_immr->im_cpm.cp_sicr) {
+		if (mode == CPM_CLK_RTX) {
+			bits |= bits << 3;
+			mask |= mask << 3;
+		} else if (mode == CPM_CLK_RX) {
+			bits <<= 3;
+			mask <<= 3;
+		}
+	}
+
 	out_be32(reg, (in_be32(reg) & ~mask) | bits);
 
 	return 0;
diff --git a/arch/powerpc/sysdev/cpm2.c b/arch/powerpc/sysdev/cpm2.c
index eb5927212fab..8dc1e24f3c23 100644
--- a/arch/powerpc/sysdev/cpm2.c
+++ b/arch/powerpc/sysdev/cpm2.c
@@ -244,9 +244,6 @@ int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 		return -EINVAL;
 	}
 
-	if (mode == CPM_CLK_RX)
-		shift += 3;
-
 	for (i = 0; i < ARRAY_SIZE(clk_map); i++) {
 		if (clk_map[i][0] == target && clk_map[i][1] == clock) {
 			bits = clk_map[i][2];
@@ -259,6 +256,14 @@ int cpm2_clk_setup(enum cpm_clk_target target, int clock, int mode)
 	bits <<= shift;
 	mask <<= shift;
 
+	if (mode == CPM_CLK_RTX) {
+		bits |= bits << 3;
+		mask |= mask << 3;
+	} else if (mode == CPM_CLK_RX) {
+		bits <<= 3;
+		mask <<= 3;
+	}
+
 	out_be32(reg, (in_be32(reg) & ~mask) | bits);
 
 	cpm2_unmap(im_cpmux);