Re: [PATCH 2/3] mmc: core: Add bus_ops for runtime pm callbacks

[merez@codeaurora.org]

Acked-by: Maya Erez <merez@codeaurora.org>

> From: Ulf Hansson <ulf.hansson@linaro.org>
>
> SDIO is the only protocol that uses runtime pm for the card device
> right now. To provide the option for sd and mmc to use runtime pm as
> well the bus_ops callback are extended with two new functions. One for
> runtime_suspend and one for runtime_resume.
>
> This patch will also implement the callbacks for SDIO to make sure
> existing functionallity is maintained.
>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>  drivers/mmc/core/bus.c  |   14 ++++++++++++--
>  drivers/mmc/core/core.h |    2 ++
>  drivers/mmc/core/sdio.c |   20 ++++++++++++++++++++
>  3 files changed, 34 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
> index e219c97..d9e8c2b 100644
> --- a/drivers/mmc/core/bus.c
> +++ b/drivers/mmc/core/bus.c
> @@ -151,15 +151,25 @@ static int mmc_bus_resume(struct device *dev)
>  static int mmc_runtime_suspend(struct device *dev)
>  {
>  	struct mmc_card *card = mmc_dev_to_card(dev);
> +	struct mmc_host *host = card->host;
> +	int ret = 0;
> +
> +	if (host->bus_ops->runtime_suspend)
> +		ret = host->bus_ops->runtime_suspend(host);
>
> -	return mmc_power_save_host(card->host);
> +	return ret;
>  }
>
>  static int mmc_runtime_resume(struct device *dev)
>  {
>  	struct mmc_card *card = mmc_dev_to_card(dev);
> +	struct mmc_host *host = card->host;
> +	int ret = 0;
> +
> +	if (host->bus_ops->runtime_resume)
> +		ret = host->bus_ops->runtime_resume(host);
>
> -	return mmc_power_restore_host(card->host);
> +	return ret;
>  }
>
>  static int mmc_runtime_idle(struct device *dev)
> diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
> index b9f18a2..9445519 100644
> --- a/drivers/mmc/core/core.h
> +++ b/drivers/mmc/core/core.h
> @@ -22,6 +22,8 @@ struct mmc_bus_ops {
>  	void (*detect)(struct mmc_host *);
>  	int (*suspend)(struct mmc_host *);
>  	int (*resume)(struct mmc_host *);
> +	int (*runtime_suspend)(struct mmc_host *);
> +	int (*runtime_resume)(struct mmc_host *);
>  	int (*power_save)(struct mmc_host *);
>  	int (*power_restore)(struct mmc_host *);
>  	int (*alive)(struct mmc_host *);
> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index aa0719a..0e6e8c1 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -988,6 +988,24 @@ static int mmc_sdio_resume(struct mmc_host *host)
>  	return err;
>  }
>
> +static int mmc_sdio_runtime_suspend(struct mmc_host *host)
> +{
> +	/*
> +	 * Once sdio clients has entirely switched to runtime pm we wrap
> +	 * the call to power_save here.
> +	 */
> +	return mmc_power_save_host(host);
> +}
> +
> +static int mmc_sdio_runtime_resume(struct mmc_host *host)
> +{
> +	/*
> +	 * Once sdio clients has entirely switched to runtime pm we wrap
> +	 * the call to power_restore here.
> +	 */
> +	return mmc_power_restore_host(host);
> +}
> +
>  static int mmc_sdio_power_restore(struct mmc_host *host)
>  {
>  	int ret;
> @@ -1054,6 +1072,8 @@ static const struct mmc_bus_ops mmc_sdio_ops = {
>  	.detect = mmc_sdio_detect,
>  	.suspend = mmc_sdio_suspend,
>  	.resume = mmc_sdio_resume,
> +	.runtime_suspend = mmc_sdio_runtime_suspend,
> +	.runtime_resume = mmc_sdio_runtime_resume,
>  	.power_restore = mmc_sdio_power_restore,
>  	.alive = mmc_sdio_alive,
>  };
> --
> 1.7.10
>
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-- 
Maya Erez
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation