07.06.2019 8:37, Bitan Biswas пишет:
> 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: Bitan Biswas <bbis...@nvidia.com>
> ---
> drivers/i2c/busses/i2c-tegra.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> index ebaa78d..1dbba39 100644
> --- a/drivers/i2c/busses/i2c-tegra.c
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -1687,7 +1687,31 @@ 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)
> };
>
Thanks!
Reviewed-by: Dmitry Osipenko <dig...@gmail.com>
--
Dmitry
