linux-kernel - [PATCH 18/31] ASoC: sh: rz-ssi: Add runtime PM support

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Message-Id: <20241106081826.1211088-19-claudiu.beznea.uj@bp.renesas.com>
Date: Wed,  6 Nov 2024 10:18:13 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: geert+renesas@...der.be,
	mturquette@...libre.com,
	sboyd@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	biju.das.jz@...renesas.com,
	prabhakar.mahadev-lad.rj@...renesas.com,
	lgirdwood@...il.com,
	broonie@...nel.org,
	magnus.damm@...il.com,
	linus.walleij@...aro.org,
	support.opensource@...semi.com,
	perex@...ex.cz,
	tiwai@...e.com,
	p.zabel@...gutronix.de,
	Adam.Thomson.Opensource@...semi.com
Cc: linux-renesas-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH 18/31] ASoC: sh: rz-ssi: Add runtime PM support

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Add runtime PM support to the ssi driver. This assert/de-assert the
reset lines on runtime suspend/resume. Along with it the de-assertion of
the reset line from probe function was removed as it is not necessary
anymore.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 sound/soc/renesas/rz-ssi.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/sound/soc/renesas/rz-ssi.c b/sound/soc/renesas/rz-ssi.c
index be96376dcd0f..16bca493a254 100644
--- a/sound/soc/renesas/rz-ssi.c
+++ b/sound/soc/renesas/rz-ssi.c
@@ -1139,14 +1139,13 @@ static int rz_ssi_probe(struct platform_device *pdev)
 		goto err_release_dma_chs;
 	}
 
-	reset_control_deassert(ssi->rstc);
 	/* Default 0 for power saving. Can be overridden via sysfs. */
 	pm_runtime_set_autosuspend_delay(dev, 0);
 	pm_runtime_use_autosuspend(dev);
 	ret = devm_pm_runtime_enable(dev);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable runtime PM!\n");
-		goto err_reset;
+		goto err_release_dma_chs;
 	}
 
 	ret = devm_snd_soc_register_component(dev, &rz_ssi_soc_component,
@@ -1154,13 +1153,11 @@ static int rz_ssi_probe(struct platform_device *pdev)
 					      ARRAY_SIZE(rz_ssi_soc_dai));
 	if (ret < 0) {
 		dev_err(dev, "failed to register snd component\n");
-		goto err_reset;
+		goto err_release_dma_chs;
 	}
 
 	return 0;
 
-err_reset:
-	reset_control_assert(ssi->rstc);
 err_release_dma_chs:
 	rz_ssi_release_dma_channels(ssi);
 
@@ -1182,10 +1179,29 @@ static const struct of_device_id rz_ssi_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, rz_ssi_of_match);
 
+static int rz_ssi_runtime_suspend(struct device *dev)
+{
+	struct rz_ssi_priv *ssi = dev_get_drvdata(dev);
+
+	return reset_control_assert(ssi->rstc);
+}
+
+static int rz_ssi_runtime_resume(struct device *dev)
+{
+	struct rz_ssi_priv *ssi = dev_get_drvdata(dev);
+
+	return reset_control_deassert(ssi->rstc);
+}
+
+static const struct dev_pm_ops rz_ssi_pm_ops = {
+	RUNTIME_PM_OPS(rz_ssi_runtime_suspend, rz_ssi_runtime_resume, NULL)
+};
+
 static struct platform_driver rz_ssi_driver = {
 	.driver	= {
 		.name	= "rz-ssi-pcm-audio",
 		.of_match_table = rz_ssi_of_match,
+		.pm = pm_ptr(&rz_ssi_pm_ops),
 	},
 	.probe		= rz_ssi_probe,
 	.remove		= rz_ssi_remove,
-- 
2.39.2