ARM: OMAP3+: DPLL: stop reparenting to same parent if already done

omap3_noncore_dpll_set_rate forces a reparent to the same clk_ref
for every call that takes place. This is an can be done only if a change
is detected.
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/dpll3xxx.c

@@ -525,7 +525,7 @@ int omap3_noncore_dpll_set_rate(struct clk_hw *hw, unsigned long rate,
 	* stuff is inherited for free
 	*/
 
-	if (!ret)
+	if (!ret && clk_get_parent(hw->clk) != new_parent)
 		__clk_reparent(hw->clk, new_parent);
 
 	return 0;