[PATCH v5 08/11] ASoC: renesas: fsi: refactor clock initialization

[phucduc.bui@gmail.com]

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

Move fsi_clk_init() from set_fmt() to the probe path.
This ensures that clock resources are acquired only once during device
initialization, instead of being looked up repeatedly whenever set_fmt()
is called.
Together with the previous conversion to devm_clk_get_optional(), the
driver can now probe successfully even when optional clocks are absent.
The set_rate() callbacks continue to validate that all required clocks
are available before applying hardware-specific configuration.

Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v5:
 - Reorder the patches 
 - update the error handling path to ensure proper cleanup by Sashiko 

Changes in v4:
 - Handle the return value of fsi_clk_init() to properly support deferred 
   probe, as suggested by Mark.

 sound/soc/renesas/fsi.c | 63 +++++++++++++++++++++--------------------
 1 file changed, 33 insertions(+), 30 deletions(-)

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index e29be2bcf952..13988c7dc926 100644
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -862,6 +862,11 @@ static int fsi_clk_set_rate_external(struct device *dev,
 	int ackmd, bpfmd;
 	int ret = 0;
 
+	if (!xck || !ick) {
+		dev_err(dev, "xck clock or ick clock is missing\n");
+		return -EINVAL;
+	}
+
 	/* check clock rate */
 	xrate = clk_get_rate(xck);
 	if (xrate % rate) {
@@ -898,6 +903,11 @@ static int fsi_clk_set_rate_cpg(struct device *dev,
 	int ackmd, bpfmd;
 	int ret = -EINVAL;
 
+	if (!ick || !div) {
+		dev_err(dev, "ick clock or div clock is missing\n");
+		return -EINVAL;
+	}
+
 	if (!(12288000 % rate))
 		target = 12288000;
 	if (!(11289600 % rate))
@@ -970,35 +980,35 @@ static int fsi_clk_set_rate_cpg(struct device *dev,
 	return ret;
 }
 
-static int fsi_clk_init(struct device *dev,
-			struct fsi_priv *fsi,
-			int xck,
-			int ick,
-			int div,
-			int (*set_rate)(struct device *dev,
-					struct fsi_priv *fsi))
+static int fsi_clk_init(struct device *dev, struct fsi_priv *fsi)
 {
 	struct fsi_clk *clock = &fsi->clock;
 	int is_porta = fsi_is_port_a(fsi);
+	int xck, ick, div;
+
+	if (fsi->clk_cpg) {
+		xck = 0; ick = 1; div = 1;
+		clock->set_rate = fsi_clk_set_rate_cpg;
+	} else {
+		xck = 1; ick = 1; div = 0;
+		clock->set_rate = fsi_clk_set_rate_external;
+	}
 
 	clock->xck	= NULL;
 	clock->ick	= NULL;
 	clock->div	= NULL;
 	clock->rate	= 0;
 	clock->count	= 0;
-	clock->set_rate	= set_rate;
 
 	clock->own = devm_clk_get(dev, NULL);
 	if (IS_ERR(clock->own))
-		return -EINVAL;
+		return dev_err_probe(dev, PTR_ERR(clock->own), "Can't get fck clock\n");
 
 	/* external clock */
 	if (xck) {
 		clock->xck = devm_clk_get_optional(dev, is_porta ? "xcka" : "xckb");
-		if (IS_ERR(clock->xck)) {
-			dev_err(dev, "can't get xck clock\n");
-			return -EINVAL;
-		}
+		if (IS_ERR(clock->xck))
+			return dev_err_probe(dev, PTR_ERR(clock->xck), "Can't get xck clock\n");
 		if (clock->xck == clock->own) {
 			dev_err(dev, "cpu doesn't support xck clock\n");
 			return -EINVAL;
@@ -1008,10 +1018,8 @@ static int fsi_clk_init(struct device *dev,
 	/* FSIACLK/FSIBCLK */
 	if (ick) {
 		clock->ick = devm_clk_get_optional(dev,  is_porta ? "icka" : "ickb");
-		if (IS_ERR(clock->ick)) {
-			dev_err(dev, "can't get ick clock\n");
-			return -EINVAL;
-		}
+		if (IS_ERR(clock->ick))
+			return dev_err_probe(dev, PTR_ERR(clock->ick), "Can't get ick clock\n");
 		if (clock->ick == clock->own) {
 			dev_err(dev, "cpu doesn't support ick clock\n");
 			return -EINVAL;
@@ -1021,10 +1029,8 @@ static int fsi_clk_init(struct device *dev,
 	/* FSI-DIV */
 	if (div) {
 		clock->div = devm_clk_get_optional(dev,  is_porta ? "diva" : "divb");
-		if (IS_ERR(clock->div)) {
-			dev_err(dev, "can't get div clock\n");
-			return -EINVAL;
-		}
+		if (IS_ERR(clock->div))
+			return dev_err_probe(dev, PTR_ERR(clock->div), "Can't get div clock\n");
 		if (clock->div == clock->own) {
 			dev_err(dev, "cpu doesn't support div clock\n");
 			return -EINVAL;
@@ -1672,15 +1678,6 @@ static int fsi_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 		break;
 	}
 
-	if (fsi_is_clk_master(fsi)) {
-		if (fsi->clk_cpg)
-			fsi_clk_init(dai->dev, fsi, 0, 1, 1,
-				     fsi_clk_set_rate_cpg);
-		else
-			fsi_clk_init(dai->dev, fsi, 1, 1, 0,
-				     fsi_clk_set_rate_external);
-	}
-
 	/* set format */
 	if (fsi_is_spdif(fsi))
 		ret = fsi_set_fmt_spdif(fsi);
@@ -1983,6 +1980,9 @@ static int fsi_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "FSIA stream probe failed\n");
 		return ret;
 	}
+	ret = fsi_clk_init(&pdev->dev, fsi);
+	if (ret)
+		goto exit_fsia;
 
 	/* FSI B setting */
 	fsi		= &master->fsib;
@@ -1996,6 +1996,9 @@ static int fsi_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "FSIB stream probe failed\n");
 		goto exit_fsia;
 	}
+	ret = fsi_clk_init(&pdev->dev, fsi);
+	if (ret)
+		goto exit_fsib;
 
 	pm_runtime_enable(&pdev->dev);
 	dev_set_drvdata(&pdev->dev, master);
-- 
2.43.0