rockchip: rk3036: fix pll config for correct frequency

There is a fixed div-2 between PLL and clk_ddr/clk_ddrphy,
so we need to double to pll output and then ddr can work
in correct frequency.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/mach-rockchip/rk3036/sdram_rk3036.c

@@ -34,10 +34,11 @@ struct rk3036_sdram_priv {
 	struct rk3036_ddr_config ddr_config;
 };
 
-/* use integer mode, 396MHz dpll setting
+/*
+ * use integer mode, dpll output 792MHz and ddr get 396MHz
  * refdiv, fbdiv, postdiv1, postdiv2
  */
-const struct pll_div dpll_init_cfg = {1, 50, 3, 1};
+const struct pll_div dpll_init_cfg = {1, 66, 2, 1};
 
 /* 396Mhz ddr timing */
 const struct rk3036_ddr_timing ddr_timing = {0x18c,