linux-kernel - Re: [PATCH v2] i2c: s3c2410: resume the I2C controller earlier

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Message-id: <53B1A5D4.6050904@samsung.com>
Date:	Mon, 30 Jun 2014 20:00:52 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Doug Anderson <dianders@...omium.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Ben Dooks <ben-linux@...ff.org>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	javier.martinez@...labora.co.uk,
	Vincent Palatin <vpalatin@...omium.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c: s3c2410: resume the I2C controller earlier

Hi Doug,

On 25.06.2014 01:56, Doug Anderson wrote:
> From: Vincent Palatin <vpalatin@...omium.org>
> 
> When the wake-up is triggered by the PMIC RTC, the RTC driver is trying
> to read the PMIC interrupt status over I2C and fails because the I2C
> controller is not resumed yet.
> Let's resume the I2C controller earlier in the _noirq phase
> (as other hardwares are doing), so we can properly get the wake-up
> condition.
> 
> Signed-off-by: Vincent Palatin <vpalatin@...omium.org>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> ---
> Changes in v2:
> - Added missing freeze/thaw/poweroff/restore
> 
>  drivers/i2c/busses/i2c-s3c2410.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
> index e828a1d..ecb389c 100644
> --- a/drivers/i2c/busses/i2c-s3c2410.c
> +++ b/drivers/i2c/busses/i2c-s3c2410.c
> @@ -1267,7 +1267,7 @@ static int s3c24xx_i2c_suspend_noirq(struct device *dev)
>  	return 0;
>  }
>  
> -static int s3c24xx_i2c_resume(struct device *dev)
> +static int s3c24xx_i2c_resume_noirq(struct device *dev)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  	struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
> @@ -1285,7 +1285,11 @@ static int s3c24xx_i2c_resume(struct device *dev)
>  static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
>  #ifdef CONFIG_PM_SLEEP
>  	.suspend_noirq = s3c24xx_i2c_suspend_noirq,
> -	.resume = s3c24xx_i2c_resume,
> +	.resume_noirq = s3c24xx_i2c_resume_noirq,
> +	.freeze_noirq = s3c24xx_i2c_suspend_noirq,
> +	.thaw_noirq = s3c24xx_i2c_resume_noirq,
> +	.poweroff_noirq = s3c24xx_i2c_suspend_noirq,
> +	.restore_noirq = s3c24xx_i2c_resume_noirq,
>  #endif
>  };

Also fixes certain issues on Exynos4-based boards.

Acked-by: Tomasz Figa <t.figa@...sung.com>

--
Best regards,
Tomasz
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