[PATCH v3 09/10] ASoC: renesas: fsi: Use clock prepare handling in startup/shutdown

[phucduc.bui@gmail.com]

From: bui duc phuc <phucduc.bui@gmail.com>

Use fsi_clk_prepare() and fsi_clk_unprepare() in dai_startup()
and dai_shutdown().

Prepare clocks only during active audio streams to reduce
unnecessary power usage, and ensure clk_prepare() and
related operations run in non-atomic contexts.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---
 sound/soc/renesas/fsi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index b93809b5da15..c3ac8b30f342 100644
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -1644,9 +1644,16 @@ static int fsi_dai_startup(struct snd_pcm_substream *substream,
 			   struct snd_soc_dai *dai)
 {
 	struct fsi_priv *fsi = fsi_get_priv(substream);
+	int ret;
 
 	fsi_clk_invalid(fsi);
 
+	if (fsi->clock.count == 0) {
+		ret = fsi_clk_prepare(fsi);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 
@@ -1655,6 +1662,8 @@ static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
 {
 	struct fsi_priv *fsi = fsi_get_priv(substream);
 
+	if (fsi->clock.count == 0)
+		fsi_clk_unprepare(fsi);
 	fsi_clk_invalid(fsi);
 }
 
-- 
2.43.0