shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-08 20:07:46 +09:00
Code Issues Packages Projects Releases Wiki Activity

i2c: tegra: Fix suspending in active runtime PM state

Browse Source 
commit 9f42de8d4e 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: 8ebf15e9c8 ("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>
This commit is contained in:
Dmitry Osipenko
2020-01-14 04:34:35 +03:00
committed by Greg Kroah-Hartman
parent 6c95e4fb88
commit 836162fa13
1 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/i2c/busses/i2c-tegra.c
View File

@@ -1710,9 +1710,14 @@ static int tegra_i2c_remove(struct platform_device *pdev)
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_resume(struct device *dev)
if (err)
return err;
err = pm_runtime_force_resume(dev);
if (err < 0)
return err;
i2c_mark_adapter_resumed(&i2c_dev->adapter);
return 0;