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

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Message-Id: <201106292339.12402.rjw@sisk.pl>
Date:	Wed, 29 Jun 2011 23:39:12 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	balbi@...com
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>, 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

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.

Thanks,
Rafael
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