Commit acc8abcb authored by Bitan Biswas's avatar Bitan Biswas Committed by Wolfram Sang

i2c: tegra: Add suspend-resume support

Post suspend I2C registers have power on reset values. Before any
transfer initialize I2C registers to prevent I2C transfer timeout
and implement suspend and resume callbacks needed. Fix below errors
post suspend:

1) Tegra I2C transfer timeout during jetson tx2 resume:

[   27.520613] pca953x 1-0074: calling pca953x_resume+0x0/0x1b0 @ 2939, parent: i2c-1
[   27.633623] tegra-i2c 3160000.i2c: i2c transfer timed out
[   27.639162] pca953x 1-0074: Unable to sync registers 0x3-0x5. -110
[   27.645336] pca953x 1-0074: Failed to sync GPIO dir registers: -110
[   27.651596] PM: dpm_run_callback(): pca953x_resume+0x0/0x1b0 returns -110
[   27.658375] pca953x 1-0074: pca953x_resume+0x0/0x1b0 returned -110 after 127152 usecs
[   27.666194] PM: Device 1-0074 failed to resume: error -110

2) Tegra I2C transfer timeout error on jetson Xavier post resume.

Remove i2c bus lock-unlock calls in resume callback as i2c_mark_adapter_*
(suspended-resumed) help ensure i2c core calls from client are not
executed before i2c-tegra resume.
Signed-off-by: default avatarBitan Biswas <bbiswas@nvidia.com>
Reviewed-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 76cc9f0e
......@@ -1681,7 +1681,31 @@ static int tegra_i2c_remove(struct platform_device *pdev)
}
#ifdef CONFIG_PM_SLEEP
static int tegra_i2c_suspend(struct device *dev)
{
struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
i2c_mark_adapter_suspended(&i2c_dev->adapter);
return 0;
}
static int tegra_i2c_resume(struct device *dev)
{
struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev);
int err;
err = tegra_i2c_init(i2c_dev, false);
if (err)
return err;
i2c_mark_adapter_resumed(&i2c_dev->adapter);
return 0;
}
static const struct dev_pm_ops tegra_i2c_pm = {
SET_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume)
SET_RUNTIME_PM_OPS(tegra_i2c_runtime_suspend, tegra_i2c_runtime_resume,
NULL)
};
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment