linux-kernel - Re: [PATCH] i2c: Factor out runtime suspend checks from PM operations

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Date:	Tue, 04 Jan 2011 15:07:37 -0800
From:	Abhijeet Dharmapurikar <adharmap@...eaurora.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Jean Delvare <khali@...ux-fr.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, linux-i2c@...r.kernel.org,
	Rabin Vincent <rabin@....in>, Ben Dooks <ben-linux@...ff.org>
Subject: Re: [PATCH] i2c: Factor out runtime suspend checks from PM operations

Mark Brown wrote:
> When devices use dev_pm_ops the I2C API is implementing standard functionality
> for integration with runtime PM and for checking for the presence of a per
> device op. The PM core provides pm_generic_ functions implementing this
> behaviour - use them to reduce coupling with future PM updates.
> 
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
>  drivers/i2c/i2c-core.c |   68 ++++++++++++++---------------------------------
>  1 files changed, 20 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 6b4cc56..6793c51 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -196,88 +196,60 @@ static int i2c_device_pm_suspend(struct device *dev)
>  {
>  	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
>  
> -	if (pm) {
> -		if (pm_runtime_suspended(dev))
> -			return 0;
> -		else
> -			return pm->suspend ? pm->suspend(dev) : 0;
> -	}
> -
> -	return i2c_legacy_suspend(dev, PMSG_SUSPEND);
> +	if (pm)
> +		return pm_generic_suspend(dev);


pm_generic_suspend() and others needs to be externed in linux/pm_runtime.h?

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