clk: sunxi-ng: Wait for lock when using fractional mode

Currently ccu_frac_helper_set_rate() doesn't wait for a lock bit to be
set before returning. Because of that, unstable clock may be used.

Add a wait for lock in the helper function.

Fixes: 89a3dfb787 ("clk: sunxi-ng: Add fractional lib")
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

drivers/clk/sunxi-ng/ccu_mult.c

@@ -114,7 +114,8 @@ static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
 	if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) {
 		ccu_frac_helper_enable(&cm->common, &cm->frac);
 
-		return ccu_frac_helper_set_rate(&cm->common, &cm->frac, rate);
+		return ccu_frac_helper_set_rate(&cm->common, &cm->frac,
+						rate, cm->lock);
 	} else {
 		ccu_frac_helper_disable(&cm->common, &cm->frac);
 	}