clk: rockchip: Add adaptive frequency scaling for pll_rk3036

Change-Id: Ifd035967afc1852df81daa2b15afea764c5b851d
Signed-off-by: Liang Chen <cl@rock-chips.com>
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>

drivers/clk/rockchip/clk-pll.c

@@ -376,6 +376,9 @@ static unsigned long rockchip_rk3036_pll_recalc_rate(struct clk_hw *hw,
 	struct rockchip_pll_rate_table cur;
 	u64 rate64 = prate;
 
+	if (pll->sel && pll->scaling)
+		return pll->scaling;
+
 	rockchip_rk3036_pll_get_params(pll, &cur);
 
 	rate64 *= cur.fbdiv;