linux-kernel - Re: [PATCH 1/2] MMC: PM: add suspend/resume in atmel-mci

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Message-ID: <4E0C3440.9010802@atmel.com>
Date:	Thu, 30 Jun 2011 10:30:56 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>, balbi@...com
CC:	cjb@...top.org, linux-mmc@...r.kernel.org,
	hans-christian.egtvedt@...el.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...32linux.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 1/2] MMC: PM: add suspend/resume in atmel-mci

Le 29/06/2011 23:39, Rafael J. Wysocki :
> On Wednesday, June 29, 2011, Felipe Balbi wrote:
>> Hi,
>>
>> On Wed, Jun 29, 2011 at 06:54:19PM +0200, Nicolas Ferre wrote:
>>> Take care of slots while going to suspend state.
>>>
>>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
>>> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
>>> ---
>>>  drivers/mmc/host/atmel-mci.c |   51 ++++++++++++++++++++++++++++++++++++++++++
>>>  1 files changed, 51 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
>>> index aa8039f..c414ebe 100644
>>> --- a/drivers/mmc/host/atmel-mci.c
>>> +++ b/drivers/mmc/host/atmel-mci.c
>>> @@ -1878,8 +1878,59 @@ static int __exit atmci_remove(struct platform_device *pdev)
>>>  	return 0;
>>>  }
>>>  
>>> +#ifdef CONFIG_PM
>>> +static int atmci_suspend(struct platform_device *pdev, pm_message_t mesg)
>>> +{
>>> +	struct atmel_mci *host = platform_get_drvdata(pdev);
>>> +	struct atmel_mci_slot *slot;
>>> +	int i, ret;
>>> +
>>> +	 for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
>>> +		slot = host->slot[i];
>>> +		if (!slot)
>>> +			continue;
>>> +		ret = mmc_suspend_host(slot->mmc);
>>> +		if (ret < 0) {
>>> +			while (--i >= 0) {
>>> +				slot = host->slot[i];
>>> +				if (slot)
>>> +					mmc_resume_host(host->slot[i]->mmc);
>>> +			}
>>> +			return ret;
>>> +		}
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +static int atmci_resume(struct platform_device *pdev)
>>> +{
>>> +	struct atmel_mci *host = platform_get_drvdata(pdev);
>>> +	struct atmel_mci_slot *slot;
>>> +	int i, ret;
>>> +
>>> +	for (i = 0; i < ATMEL_MCI_MAX_NR_SLOTS; i++) {
>>> +		slot = host->slot[i];
>>> +		if (!slot)
>>> +			continue;
>>> +		ret = mmc_resume_host(slot->mmc);
>>> +		if (ret < 0)
>>> +			return ret;
>>> +	}
>>> +
>>> +	return 0;
>>> +}
>>> +#else
>>> +#define atmci_suspend	NULL
>>> +#define atmci_resume	NULL
>>> +#endif
>>> +
>>> +
>>> +
>>>  static struct platform_driver atmci_driver = {
>>>  	.remove		= __exit_p(atmci_remove),
>>> +	.suspend	= atmci_suspend,
>>> +	.resume		= atmci_resume,
>>
>> should this be using dev_pm_ops instead ?
> 
> It should.  Also, please remember to initialize the hibernate callback
> pointers too, e.g. via the SIMPLE_DEV_PM_OPS() macro.

Felipe, Rafael,
Thanks for your feedback. I will implement this in a v2 patch.

BTW, should I use #ifdef CONFIG_PM or #ifdef CONFIG_PM_SLEEP?

Best regards,
-- 
Nicolas Ferre

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