[PATCH v2] ASoC: rsnd: don't call clk_disable_unprepare() if can't use

[Kuninori Morimoto]

From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>

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 at glider.be>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
v1 -> v2

	- reset adg->clk_rate[i] = 0

 sound/soc/sh/rcar/adg.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c
index b9aacf3d3b29..abdfd9cf91e2 100644
--- 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);
 	}
 }
 
-- 
2.25.1