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

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Date:	Tue, 12 Mar 2013 16:31:32 +0000
From:	James Hogan <james.hogan@...tec.com>
To:	Jaehoon Chung <jh80.chung@...sung.com>
CC:	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Chris Ball <cjb@...top.org>
Subject: Re: [PATCH] mmc: dw_mmc: setpower on MMC_POWER_{UP,OFF}

On 12/03/13 11:26, Jaehoon Chung wrote:
> Looks good to me.
> 
> Acked-by: Jaehoon Chung <jh80.chung@...sung.com>

Thanks Jaehoon

Cheers
James

> 
> 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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