[PATCH V2] MMC: PM: add suspend/resume in atmel-mci

[u.kleine-koenig@pengutronix.de (Uwe Kleine-König)]

Hello Nicolas,

On Thu, Jun 30, 2011 at 03:49:41PM +0200, Nicolas Ferre wrote:
> Take care of slots while going to suspend state.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> Signed-off-by: Uwe Kleine-K?nig <u.kleine-koenig@pengutronix.de>
> ---
> V2: move to pm_ops
> 
>  drivers/mmc/host/atmel-mci.c |   47 ++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 47 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index aa8039f..058f1842 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -1878,10 +1878,57 @@ static int __exit atmci_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM
> +static int atmci_suspend(struct device *dev)
> +{
> +	struct atmel_mci *host = dev_get_drvdata(dev);
> +	struct atmel_mci_slot *slot;
> +	int i, ret;
slot and ret can have a more local scope.

> +
> +	 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);
hmm, mmc_resume_host could fail. But probably you cannot handle that in
a sane way, do you?

> +			}
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int atmci_resume(struct device *dev)
> +{
> +	struct atmel_mci *host = dev_get_drvdata(dev);
> +	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;
Maybe you should try to resume host 5 even if resuming host 4 failed?

> +	}
> +
> +	return 0;
> +}
> +#endif
> +static SIMPLE_DEV_PM_OPS(atmci_pm, atmci_suspend, atmci_resume);
> +
> +
For my taste a single empty line is enough.

>  static struct platform_driver atmci_driver = {
>  	.remove		= __exit_p(atmci_remove),
>  	.driver		= {
>  		.name		= "atmel_mci",
> +		.pm		= &atmci_pm,
>  	},
>  };

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |