linux-kernel - Re: [PATCH v1] mmc: core: move the cache disabling operation to mmc

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Date:	Sun, 20 Jan 2013 14:26:40 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Maya Erez <merez@...eaurora.org>
Cc:	linux-mmc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] mmc: core: move the cache disabling operation to mmc_suspend

On 20 January 2013 12:29, Maya Erez <merez@...eaurora.org> wrote:
> Cache control is an eMMC feature and in therefore should be
> part of MMC's bus resume operations, performed in mmc_suspend,
> rather than in the generic mmc_suspend_host().
>
> Signed-off-by: Maya Erez <merez@...eaurora.org>
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index aaed768..b438bb2 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2388,6 +2388,7 @@ EXPORT_SYMBOL(mmc_flush_cache);
>   * Turn the cache ON/OFF.
>   * Turning the cache OFF shall trigger flushing of the data
>   * to the non-volatile storage.
> + * This function should be called with host claimed
>   */
>  int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
>  {
> @@ -2399,7 +2400,6 @@ int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
>                         mmc_card_is_removable(host))
>                 return err;
>
> -       mmc_claim_host(host);
>         if (card && mmc_card_mmc(card) &&
>                         (card->ext_csd.cache_size > 0)) {
>                 enable = !!enable;
> @@ -2417,7 +2417,6 @@ int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
>                                 card->ext_csd.cache_ctrl = enable;
>                 }
>         }
> -       mmc_release_host(host);
>
>         return err;
>  }
> @@ -2436,10 +2435,6 @@ int mmc_suspend_host(struct mmc_host *host)
>         cancel_delayed_work(&host->detect);
>         mmc_flush_scheduled_work();
>
> -       err = mmc_cache_ctrl(host, 0);
> -       if (err)
> -               goto out;
> -
>         mmc_bus_get(host);
>         if (host->bus_ops && !host->bus_dead) {
>                 if (host->bus_ops->suspend) {
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index e6e3911..dc17d40 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1379,6 +1379,11 @@ static int mmc_suspend(struct mmc_host *host)
>         BUG_ON(!host->card);
>
>         mmc_claim_host(host);
> +
> +       err = mmc_cache_ctrl(host, 0);
> +       if (err)
> +               goto out;
> +
>         if (mmc_can_poweroff_notify(host->card))
>                 err = mmc_poweroff_notify(host->card, EXT_CSD_POWER_OFF_SHORT);
>         else if (mmc_card_can_sleep(host))
> @@ -1386,8 +1391,9 @@ static int mmc_suspend(struct mmc_host *host)
>         else if (!mmc_host_is_spi(host))
>                 err = mmc_deselect_cards(host);
>         host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_200);
> -       mmc_release_host(host);
>
> +out:
> +       mmc_release_host(host);
>         return err;
>  }
>
> --
> 1.7.3.3
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> --
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Acked-by: Ulf Hansson <ulf.hansson@...aro.org>
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