linux-kernel - Re: A MMC card transfer issue

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Message-ID: <7BDF62B4-A11A-4CB4-9F80-F2206C2655F9@marvell.com>
Date:	Wed, 26 Jan 2011 17:43:46 -0800
From:	Philip Rakity <prakity@...vell.com>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
CC:	Chris Ball <cjb@...top.org>, Kyungmin Park <kmpark@...radead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"andrew.chih.howe.khor@...el.com" <andrew.chih.howe.khor@...el.com>,
	"kok.howg.ewe@...el.com" <kok.howg.ewe@...el.com>,
	Toshiharu Okada <toshiharu-linux@....okisemi.com>
Subject: Re: A MMC card transfer issue


There is no good answer.  

Doing this patch for 2.6.20 or so a long time ago had problems because some controllers did not work.  The failures were equally unpleasant.

The failure you see today is at least not a regression since 1 bit did not work before.  

We hope that developers who know their h/w works add the CAP. 


On Jan 26, 2011, at 5:31 PM, Tomoya MORINAGA wrote:

> Hi Philip,
> 
>> which MMC driver are you using.
> Could you teach me how to get the information ?
> 
>> you need to have the driver or the low level code enable this QUIRK.
> BTW, Is the above permanent treatment?
> I think modifying kernel source code isn't preferred.
> 
> Thanks,
> -----------------------------------------
> Tomoya MORINAGA
> OKI SEMICONDUCTOR CO., LTD.
> 
>> -----Original Message-----
>> From: Philip Rakity [mailto:prakity@...vell.com] 
>> Sent: Thursday, January 27, 2011 10:04 AM
>> To: Tomoya MORINAGA
>> Cc: Chris Ball; Kyungmin Park; linux-mmc@...r.kernel.org; 
>> linux-kernel@...r.kernel.org; 
>> andrew.chih.howe.khor@...el.com; kok.howg.ewe@...el.com
>> Subject: Re: A MMC card transfer issue
>> 
>> 
>> yes
>> 
>> you need to have the driver or the low level code enable this QUIRK.
>> 
>> which mmc driver are you using.
>> 
>> On Jan 26, 2011, at 5:00 PM, Tomoya MORINAGA wrote:
>> 
>>> Hi Philip,
>>> 
>>> On Thursday, January 27, 2011 12:42 AM, Philip Rakity wrote:
>>>> Did you define the CAP for BUS WIDTH ? 
>>>> 
>>>> MMC_CAP_BUS_WIDTH_TEST
>>>> 
>>>> in the driver or the platform driver ?
>>> 
>>> Let me make the above meaning clear.
>>> 
>>> I don't modify kernel source code "drivers/mmc" at all Is the above 
>>> mean I must modify something kernel source code ?
>>> 
>>> Thanks,
>>> -----------------------------------------
>>> Tomoya MORINAGA
>>> OKI SEMICONDUCTOR CO., LTD.
>>> 
>> 
> 

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