ASoC: rsnd: don't call clk_disable_unprepare() if can't use

We need to care clock accessibility,
because we might can't use clock for some reasons.

It sets clk_rate for each clocks when enabled.
This means it doesn't have clk_rate if we can't use.
We can avoid to call clk_disable_unprepare() in such case.

Link: https://lore.kernel.org/r/CAMuHMdWvB+p=2JqTsO7bR8uJqKqO5A2XgXFXsVAjHk3hcxgcTw@mail.gmail.com
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/87eejpgoi9.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c
index b9aacf3..abdfd9c 100644 (file)
--- a/sound/soc/sh/rcar/adg.c
+++ b/sound/soc/sh/rcar/adg.c
@@ -366,25 +366,27 @@ void rsnd_adg_clk_control(struct rsnd_priv *priv, int enable)
        struct rsnd_adg *adg = rsnd_priv_to_adg(priv);
        struct device *dev = rsnd_priv_to_dev(priv);
        struct clk *clk;
-       int i, ret;
+       int i;
 
        for_each_rsnd_clk(clk, adg, i) {
-               ret = 0;
                if (enable) {
-                       ret = clk_prepare_enable(clk);
+                       int ret = clk_prepare_enable(clk);
 
                        /*
                         * We shouldn't use clk_get_rate() under
                         * atomic context. Let's keep it when
                         * rsnd_adg_clk_enable() was called
                         */
-                       adg->clk_rate[i] = clk_get_rate(adg->clk[i]);
+                       adg->clk_rate[i] = 0;
+                       if (ret < 0)
+                               dev_warn(dev, "can't use clk %d\n", i);
+                       else
+                               adg->clk_rate[i] = clk_get_rate(clk);
                } else {
-                       clk_disable_unprepare(clk);
+                       if (adg->clk_rate[i])
+                               clk_disable_unprepare(clk);
+                       adg->clk_rate[i] = 0;
                }
-
-               if (ret < 0)
-                       dev_warn(dev, "can't use clk %d\n", i);
        }
 }