linux-kernel - Re: [PATCH] mmc: dw_mmc: setpower on MMC_POWER

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Message-id: <513F10D9.9060402@samsung.com>
Date:	Tue, 12 Mar 2013 20:26:17 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	James Hogan <james.hogan@...tec.com>
Cc:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Chris Ball <cjb@...top.org>
Subject: Re: [PATCH] mmc: dw_mmc: setpower on MMC_POWER_{UP,OFF}

Looks good to me.

Acked-by: Jaehoon Chung <jh80.chung@...sung.com>

Best Regards,
Jaehoon Chung

On 03/12/2013 07:43 PM, James Hogan wrote:
> Call the setpower platform callback in response to set_ios with
> ios->power_mode == MMC_POWER_UP or MMC_POWER_OFF, instead of from the
> card detect work function.
> 
> This appears to fix a problem I have where a card stuck in a funny state
> doesn't get properly cleared by the power being turned off, presumably
> due to lack of power sequencing. This resulted in the following log
> messages after boot:
> 
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 300000Hz, actual 298922HZ div = 167)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 200000Hz, actual 199680HZ div = 250)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 195765Hz, actual 195764HZ div = 255)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 400000Hz, actual 399360HZ div = 125)
> mmc0: error -110 whilst initialising SD card
> mmc_host mmc0: Bus speed (slot 0) = 99840000Hz (slot req 300000Hz, actual 298922HZ div = 167)
> 
> Signed-off-by: James Hogan <james.hogan@...tec.com>
> Cc: Seungwon Jeon <tgih.jun@...sung.com>
> Cc: Jaehoon Chung <jh80.chung@...sung.com>
> Cc: Chris Ball <cjb@...top.org>
> ---
>  drivers/mmc/host/dw_mmc.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 60063cc..1a42c7c 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -818,6 +818,14 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>  	switch (ios->power_mode) {
>  	case MMC_POWER_UP:
>  		set_bit(DW_MMC_CARD_NEED_INIT, &slot->flags);
> +		/* Power up slot */
> +		if (slot->host->pdata->setpower)
> +			slot->host->pdata->setpower(slot->id, mmc->ocr_avail);
> +		break;
> +	case MMC_POWER_OFF:
> +		/* Power down slot */
> +		if (slot->host->pdata->setpower)
> +			slot->host->pdata->setpower(slot->id, 0);
>  		break;
>  	default:
>  		break;
> @@ -1674,10 +1682,6 @@ static void dw_mci_work_routine_card(struct work_struct *work)
>  			dev_dbg(&slot->mmc->class_dev, "card %s\n",
>  				present ? "inserted" : "removed");
>  
> -			/* Power up slot (before spin_lock, may sleep) */
> -			if (present != 0 && host->pdata->setpower)
> -				host->pdata->setpower(slot->id, mmc->ocr_avail);
> -
>  			spin_lock_bh(&host->lock);
>  
>  			/* Card change detected */
> @@ -1760,10 +1764,6 @@ static void dw_mci_work_routine_card(struct work_struct *work)
>  
>  			spin_unlock_bh(&host->lock);
>  
> -			/* Power down slot (after spin_unlock, may sleep) */
> -			if (present == 0 && host->pdata->setpower)
> -				host->pdata->setpower(slot->id, 0);
> -
>  			present = dw_mci_get_cd(mmc);
>  		}
>  
> 

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