clk: rockchip: optimizing ddrclk_scpi_recalc_rate behavior

[firefly-linux-kernel-4.4.55.git] / drivers / clk / rockchip / clk-ddr.c

diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c
index c247c9aaf5f586290cb26bbf9ac7f540fcfec724..9892c982d194e46122f1efaef5ed3d3253e14b59 100644 (file)
--- a/drivers/clk/rockchip/clk-ddr.c
+++ b/drivers/clk/rockchip/clk-ddr.c
@@ -105,6 +105,8 @@ static const struct clk_ops rockchip_ddrclk_sip_ops = {
        .get_parent = rockchip_ddrclk_get_parent,
 };
 
+static u32 ddr_clk_cached;
+
 static int rockchip_ddrclk_scpi_set_rate(struct clk_hw *hw, unsigned long drate,
                                         unsigned long prate)
 {
@@ -112,6 +114,13 @@ static int rockchip_ddrclk_scpi_set_rate(struct clk_hw *hw, unsigned long drate,
        u32 lcdc_type = 7;
 
        ret = scpi_ddr_set_clk_rate(drate / MHZ, lcdc_type);
+       if (ret) {
+               ddr_clk_cached = ret;
+               ret = 0;
+       } else {
+               ddr_clk_cached = 0;
+               ret = -1;
+       }
 
        return ret;
 }
@@ -119,7 +128,10 @@ static int rockchip_ddrclk_scpi_set_rate(struct clk_hw *hw, unsigned long drate,
 static unsigned long rockchip_ddrclk_scpi_recalc_rate(struct clk_hw *hw,
                                                      unsigned long parent_rate)
 {
-       return (MHZ * scpi_ddr_get_clk_rate());
+       if (ddr_clk_cached)
+               return (MHZ * ddr_clk_cached);
+       else
+               return (MHZ * scpi_ddr_get_clk_rate());
 }
 
 static long rockchip_ddrclk_scpi_round_rate(struct clk_hw *hw,