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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Thierry Reding <treding@nvidia.com>,
        Dmitry Osipenko <digetx@gmail.com>,
        Wolfram Sang <wsa@the-dreams.de>
Subject: [PATCH 5.4 116/222] i2c: tegra: Fix suspending in active runtime PM state
Date:   Wed, 22 Jan 2020 10:28:22 +0100
Message-Id: <20200122092842.038196458@linuxfoundation.org>
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From: Dmitry Osipenko <digetx@gmail.com>

commit 9f42de8d4ec2304f10bbc51dc0484f3503d61196 upstream.

I noticed that sometime I2C clock is kept enabled during suspend-resume.
This happens because runtime PM defers dynamic suspension and thus it may
happen that runtime PM is in active state when system enters into suspend.
In particular I2C controller that is used for CPU's DVFS is often kept ON
during suspend because CPU's voltage scaling happens quite often.

Fixes: 8ebf15e9c869 ("i2c: tegra: Move suspend handling to NOIRQ phase")
Cc: <stable@vger.kernel.org> # v5.4+
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/i2c/busses/i2c-tegra.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1710,9 +1710,14 @@ static int tegra_i2c_remove(struct platf
 static int __maybe_unused tegra_i2c_suspend(struct device *dev)
 {
 	struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
+	int err;
 
 	i2c_mark_adapter_suspended(&i2c_dev->adapter);
 
+	err = pm_runtime_force_suspend(dev);
+	if (err < 0)
+		return err;
+
 	return 0;
 }
 
@@ -1733,6 +1738,10 @@ static int __maybe_unused tegra_i2c_resu
 	if (err)
 		return err;
 
+	err = pm_runtime_force_resume(dev);
+	if (err < 0)
+		return err;
+
 	i2c_mark_adapter_resumed(&i2c_dev->adapter);
 
 	return 0;