linux-kernel - Re: [RFT][PATCH v3] mmc: change cb710-mmc platform power management to use dev_pm

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Message-ID: <CAPDyKFqYd=CqfTbO8cCqobg=StjYgeq6NhfKecbnPXc8B+W7FQ@mail.gmail.com>
Date:	Fri, 14 Feb 2014 15:32:47 +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>,
	Shuah Khan <shuahkhan@...il.com>
Subject: Re: [RFT][PATCH v3] mmc: change cb710-mmc platform power management
 to use dev_pm_ops

On 13 February 2014 14:49, Shuah Khan <shuah.kh@...sung.com> wrote:
> On 02/13/2014 02:47 AM, Ulf Hansson wrote:
>>
>> On 12 February 2014 22:21, 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 using SIMPLE_DEV_PM_OPS().
>>>
>>> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
>>> ---
>>>
>>> patch v3: Addresses review comments on patch v2
>>>
>>>   drivers/mmc/host/cb710-mmc.c |   40
>>> ++++++++++++++++------------------------
>>>   1 file changed, 16 insertions(+), 24 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/cb710-mmc.c b/drivers/mmc/host/cb710-mmc.c
>>> index 1087b4c..2dc7b2dc 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);
>>> @@ -762,14 +742,26 @@ static int cb710_mmc_exit(struct platform_device
>>> *pdev)
>>>          return 0;
>>>   }
>>>
>>> +#ifdef CONFIG_PM_SLEEP
>>> +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;
>>> +}
>>> +#
>>> +#define cb710_mmc_suspend_resume NULL
>>
>>
>> You don't need this. The macro will handle this for you.
>>
>
> Without this compiles fail when CONFIG_PM_SLEEP is not defined.

No it won't. You can remove the #else statement.

The functions don't have to be defined for !CONFIG_PM_SLEEP, since the
macro will handle that.

Kind regards
Ulf Hansson

>
> -- Shuah
>
>
> --
> Shuah Khan
> Senior Linux Kernel Developer - Open Source Group
> Samsung Research America(Silicon Valley)
> shuah.kh@...sung.com | (970) 672-0658
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