linux-kernel - [PATCH 1/6] ASoC: fsl_esai: Don't use devm_regmap_init_mmio

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Message-Id: <1616579928-22428-2-git-send-email-shengjiu.wang@nxp.com>
Date:   Wed, 24 Mar 2021 17:58:43 +0800
From:   Shengjiu Wang <shengjiu.wang@....com>
To:     timur@...nel.org, nicoleotsuka@...il.com, Xiubo.Lee@...il.com,
        festevam@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] ASoC: fsl_esai: Don't use devm_regmap_init_mmio_clk

When there is power domain bind with bus clock,

The call flow:
devm_regmap_init_mmio_clk
    - clk_prepare()
       - clk_pm_runtime_get()

cause the power domain of clock always be enabled after
regmap_init(). which impact the power consumption.

So use devm_regmap_init_mmio instead of
devm_regmap_init_mmio_clk,but explicitly enable
clock when it is used.

Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
---
 sound/soc/fsl/fsl_esai.c | 48 ++++++++++++++++++++++++++++++----------
 1 file changed, 36 insertions(+), 12 deletions(-)

diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index 41b154417b92..c0d4f3c5dbb1 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -945,6 +945,9 @@ static const struct regmap_config fsl_esai_regmap_config = {
 	.cache_type = REGCACHE_FLAT,
 };
 
+static int fsl_esai_runtime_resume(struct device *dev);
+static int fsl_esai_runtime_suspend(struct device *dev);
+
 static int fsl_esai_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
@@ -969,8 +972,7 @@ static int fsl_esai_probe(struct platform_device *pdev)
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 
-	esai_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
-			"core", regs, &fsl_esai_regmap_config);
+	esai_priv->regmap = devm_regmap_init_mmio(&pdev->dev, regs, &fsl_esai_regmap_config);
 	if (IS_ERR(esai_priv->regmap)) {
 		dev_err(&pdev->dev, "failed to init regmap: %ld\n",
 				PTR_ERR(esai_priv->regmap));
@@ -1039,11 +1041,23 @@ static int fsl_esai_probe(struct platform_device *pdev)
 	}
 
 	dev_set_drvdata(&pdev->dev, esai_priv);
-
 	spin_lock_init(&esai_priv->lock);
+	pm_runtime_enable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev)) {
+		ret = fsl_esai_runtime_resume(&pdev->dev);
+		if (ret)
+			goto err_pm_disable;
+	}
+
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&pdev->dev);
+		goto err_pm_get_sync;
+	}
+
 	ret = fsl_esai_hw_init(esai_priv);
 	if (ret)
-		return ret;
+		goto err_pm_get_sync;
 
 	esai_priv->tx_mask = 0xFFFFFFFF;
 	esai_priv->rx_mask = 0xFFFFFFFF;
@@ -1054,24 +1068,33 @@ static int fsl_esai_probe(struct platform_device *pdev)
 	regmap_write(esai_priv->regmap, REG_ESAI_RSMA, 0);
 	regmap_write(esai_priv->regmap, REG_ESAI_RSMB, 0);
 
+	ret = pm_runtime_put_sync(&pdev->dev);
+	if (ret < 0)
+		goto err_pm_get_sync;
+
 	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component,
 					      &fsl_esai_dai, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
-		return ret;
+		goto err_pm_get_sync;
 	}
 
 	INIT_WORK(&esai_priv->work, fsl_esai_hw_reset);
 
-	pm_runtime_enable(&pdev->dev);
-
-	regcache_cache_only(esai_priv->regmap, true);
-
 	ret = imx_pcm_dma_init(pdev, IMX_ESAI_DMABUF_SIZE);
-	if (ret)
+	if (ret) {
 		dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);
+		goto err_pm_get_sync;
+	}
 
 	return ret;
+
+err_pm_get_sync:
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		fsl_esai_runtime_suspend(&pdev->dev);
+err_pm_disable:
+	pm_runtime_disable(&pdev->dev);
+	return ret;
 }
 
 static int fsl_esai_remove(struct platform_device *pdev)
@@ -1079,6 +1102,9 @@ static int fsl_esai_remove(struct platform_device *pdev)
 	struct fsl_esai *esai_priv = platform_get_drvdata(pdev);
 
 	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		fsl_esai_runtime_suspend(&pdev->dev);
+
 	cancel_work_sync(&esai_priv->work);
 
 	return 0;
@@ -1092,7 +1118,6 @@ static const struct of_device_id fsl_esai_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids);
 
-#ifdef CONFIG_PM
 static int fsl_esai_runtime_resume(struct device *dev)
 {
 	struct fsl_esai *esai = dev_get_drvdata(dev);
@@ -1160,7 +1185,6 @@ static int fsl_esai_runtime_suspend(struct device *dev)
 
 	return 0;
 }
-#endif /* CONFIG_PM */
 
 static const struct dev_pm_ops fsl_esai_pm_ops = {
 	SET_RUNTIME_PM_OPS(fsl_esai_runtime_suspend,
-- 
2.27.0