linux-kernel - Re: [RFT][PATCH v2] mmc: change cb710-mmc platform power management to use dev_pm

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Date:	Tue, 11 Feb 2014 23:43:19 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Shuah Khan <shuah.kh@...sung.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>, mirq-linux@...e.qmqm.pl,
	Chris Ball <chris@...ntf.net>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>, shuahkhan@...il.com
Subject: Re: [RFT][PATCH v2] mmc: change cb710-mmc platform power management
 to use dev_pm_ops

On 11 February 2014 21:16, Shuah Khan <shuah.kh@...sung.com> wrote:
> Change cb710-mmc platform driver to register pm ops using dev_pm_ops instead
> of legacy pm_ops. The existing legacy suspend/resume routines are identical
> and simply clear IRQ mask in the device in case it got undefined during sleep
> state. Changed code to collapse suspend and resume into one .pm interface
> for suspend and resume which gets installed for suspend, freeze, poweroff,
> thaw, restore, and resume states.
>
> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
> ---
>
> patch v2: Addresses review comments on patch v1
>
>  drivers/mmc/host/cb710-mmc.c |   42 ++++++++++++++++++++----------------------
>  1 file changed, 20 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/mmc/host/cb710-mmc.c b/drivers/mmc/host/cb710-mmc.c
> index 1087b4c..ccf7a75 100644
> --- a/drivers/mmc/host/cb710-mmc.c
> +++ b/drivers/mmc/host/cb710-mmc.c
> @@ -662,26 +662,6 @@ static const struct mmc_host_ops cb710_mmc_host = {
>         .get_cd = cb710_mmc_get_cd,
>  };
>
> -#ifdef CONFIG_PM
> -
> -static int cb710_mmc_suspend(struct platform_device *pdev, pm_message_t state)
> -{
> -       struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
> -
> -       cb710_mmc_enable_irq(slot, 0, ~0);
> -       return 0;
> -}
> -
> -static int cb710_mmc_resume(struct platform_device *pdev)
> -{
> -       struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
> -
> -       cb710_mmc_enable_irq(slot, 0, ~0);
> -       return 0;
> -}
> -
> -#endif /* CONFIG_PM */
> -
>  static int cb710_mmc_init(struct platform_device *pdev)
>  {
>         struct cb710_slot *slot = cb710_pdev_to_slot(pdev);
> @@ -762,13 +742,31 @@ static int cb710_mmc_exit(struct platform_device *pdev)
>         return 0;
>  }
>
> +#ifdef CONFIG_PM
> +static int cb710_mmc_suspend_resume(struct device *dev)
> +{
> +       struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev));
> +
> +       cb710_mmc_enable_irq(slot, 0, ~0);
> +       return 0;
> +}
> +
> +static const struct dev_pm_ops cb710_mmc_dev_pm_ops = {
> +       .suspend = cb710_mmc_suspend_resume,
> +       .resume = cb710_mmc_suspend_resume,
> +       /* Hibernate hooks */
> +       .freeze = cb710_mmc_suspend_resume,
> +       .thaw = cb710_mmc_suspend_resume,
> +       .poweroff = cb710_mmc_suspend_resume,
> +       .restore = cb710_mmc_suspend_resume,
> +};
> +#endif
>  static struct platform_driver cb710_mmc_driver = {
>         .driver.name = "cb710-mmc",
>         .probe = cb710_mmc_init,
>         .remove = cb710_mmc_exit,
>  #ifdef CONFIG_PM
> -       .suspend = cb710_mmc_suspend,
> -       .resume = cb710_mmc_resume,
> +       .driver.pm = &cb710_mmc_dev_pm_ops,
>  #endif
>  };

I suggest you have a look at SIMPLE_DEV_PM_OPS macro. That would
simplify this patch.

Kind regards
Ulf Hansson

>
> --
> 1.7.10.4
>
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