linux-kernel - Re: [PATCH V3] i2c: busses: tegra: Add suspend-resume support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <21a2b722-cd1d-284f-2a4d-99bb12c98afd@gmail.com>
Date:   Fri, 7 Jun 2019 09:27:45 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Bitan Biswas <bbiswas@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Shardar Mohammed <smohammed@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Mantravadi Karthik <mkarthik@...dia.com>
Subject: Re: [PATCH V3] i2c: busses: tegra: Add suspend-resume support

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 <bbiswas@...dia.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 <digetx@...il.com>

-- 
Dmitry