[PATCH v6 11/11] ASoC: renesas: fsi: Add SPU clock control in hw_startup/shutdown

[phucduc . bui]

From: bui duc phuc <phucduc.bui@xxxxxxxxx>

Enable and disable the SPU clock in fsi_hw_startup() and
fsi_hw_shutdown() to ensure the clock is active while the
driver accesses hardware registers.

Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
Signed-off-by: bui duc phuc <phucduc.bui@xxxxxxxxx>
---
Changes in v6:
 - Add Acked-by tag from Kuninori Morimoto.
 - Minor refactor in clock enable/disable paths.
Changes in v5:
 - Drop spu_count and rely on the clk core for clock reference
   counting.
 sound/soc/renesas/fsi.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index e26f39dfe059..b72396b5de7d 100644
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -1560,6 +1560,11 @@ static int fsi_hw_startup(struct fsi_priv *fsi,
 			  struct device *dev)
 {
 	u32 data = 0;
+	int ret;
+	/* enable spu bus bridge clock */
+	ret = clk_enable(fsi->master->clk_spu);
+	if (ret)
+		return ret;
 
 	/* clock setting */
 	if (fsi_is_clk_master(fsi))
@@ -1605,8 +1610,13 @@ static int fsi_hw_startup(struct fsi_priv *fsi,
 	fsi_fifo_init(fsi, io, dev);
 
 	/* start master clock */
-	if (fsi_is_clk_master(fsi))
-		return fsi_clk_enable(dev, fsi);
+	if (fsi_is_clk_master(fsi)) {
+		ret = fsi_clk_enable(dev, fsi);
+		if (ret) {
+			clk_disable(fsi->master->clk_spu);
+			return ret;
+		}
+	}
 
 	return 0;
 }
@@ -1614,9 +1624,15 @@ static int fsi_hw_startup(struct fsi_priv *fsi,
 static int fsi_hw_shutdown(struct fsi_priv *fsi,
 			    struct device *dev)
 {
+	int ret;
 	/* stop master clock */
-	if (fsi_is_clk_master(fsi))
-		return fsi_clk_disable(dev, fsi);
+	if (fsi_is_clk_master(fsi)) {
+		ret = fsi_clk_disable(dev, fsi);
+		if (ret)
+			return ret;
+	}
+	/* stop spu bus bridge clock */
+	clk_disable(fsi->master->clk_spu);
 
 	return 0;
 }
-- 
2.43.0