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;