linux-kernel - [PATCH v4 11/31] i2c: tegra: Factor out runtime PM and hardware initialization

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Message-Id: <20200905204151.25343-12-digetx@gmail.com>
Date:   Sat,  5 Sep 2020 23:41:31 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 11/31] i2c: tegra: Factor out runtime PM and hardware initialization

Factor out runtime PM and hardware initialization into separate function
in order have a cleaner error unwinding in the probe function.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/i2c/busses/i2c-tegra.c | 68 +++++++++++++++++++---------------
 1 file changed, 38 insertions(+), 30 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 8e4e72dec6ea..6e5af03d0b1d 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1670,6 +1670,37 @@ static void tegra_i2c_release_clocks(struct tegra_i2c_dev *i2c_dev)
 	clk_bulk_unprepare(i2c_dev->nclocks, i2c_dev->clocks);
 }
 
+static int tegra_i2c_init_runtime_pm_and_hardware(struct tegra_i2c_dev *i2c_dev)
+{
+	int ret;
+
+	/*
+	 * VI I2C is in VE power domain which is not always on and not
+	 * an IRQ safe. So, IRQ safe device can't be attached to a non-IRQ
+	 * safe domain as it prevents powering off the PM domain.
+	 * Also, VI I2C device don't need to use runtime IRQ safe as it will
+	 * not be used for atomic transfers.
+	 */
+	if (!i2c_dev->is_vi)
+		pm_runtime_irq_safe(i2c_dev->dev);
+
+	pm_runtime_enable(i2c_dev->dev);
+
+	ret = pm_runtime_get_sync(i2c_dev->dev);
+	if (ret < 0) {
+		dev_err(i2c_dev->dev, "runtime resume failed: %d\n", ret);
+		pm_runtime_disable(i2c_dev->dev);
+		return ret;
+	}
+
+	/* initialize hardware state */
+	ret = tegra_i2c_init(i2c_dev);
+
+	pm_runtime_put(i2c_dev->dev);
+
+	return ret;
+}
+
 static int tegra_i2c_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -1728,41 +1759,23 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, i2c_dev);
 
-	/*
-	 * VI I2C is in VE power domain which is not always on and not
-	 * an IRQ safe. So, IRQ safe device can't be attached to a non-IRQ
-	 * safe domain as it prevents powering off the PM domain.
-	 * Also, VI I2C device don't need to use runtime IRQ safe as it will
-	 * not be used for atomic transfers.
-	 */
-	if (!i2c_dev->is_vi)
-		pm_runtime_irq_safe(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
-	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0) {
-		dev_err(dev, "runtime resume failed\n");
-		goto disable_rpm;
-	}
-
 	if (i2c_dev->hw->supports_bus_clear)
 		i2c_dev->adapter.bus_recovery_info = &tegra_i2c_recovery_info;
 
 	ret = tegra_i2c_init_dma(i2c_dev);
 	if (ret < 0)
-		goto put_rpm;
+		goto release_clocks;
 
-	ret = tegra_i2c_init(i2c_dev);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to initialize i2c controller\n");
+	ret = tegra_i2c_init_runtime_pm_and_hardware(i2c_dev);
+	if (ret)
 		goto release_dma;
-	}
 
 	irq_set_status_flags(i2c_dev->irq, IRQ_NOAUTOEN);
 
 	ret = devm_request_irq(&pdev->dev, i2c_dev->irq, tegra_i2c_isr,
 			       IRQF_NO_SUSPEND, dev_name(&pdev->dev), i2c_dev);
 	if (ret)
-		goto release_dma;
+		goto release_rpm;
 
 	i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
 	i2c_dev->adapter.owner = THIS_MODULE;
@@ -1777,18 +1790,13 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	if (ret)
 		goto release_dma;
 
-	pm_runtime_put(&pdev->dev);
-
 	return 0;
 
+release_rpm:
+	pm_runtime_disable(i2c_dev->dev);
 release_dma:
 	tegra_i2c_release_dma(i2c_dev);
-
-put_rpm:
-	pm_runtime_put_sync(&pdev->dev);
-
-disable_rpm:
-	pm_runtime_disable(&pdev->dev);
+release_clocks:
 	tegra_i2c_release_clocks(i2c_dev);
 
 	return ret;
-- 
2.27.0