linux-kernel - Re: [PATCH 1/2] mmc: core: Add a capability for disabling mmc cards

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Message-ID: <5ED03810-753A-407D-A994-E1FD22BE45E6@marvell.com>
Date:	Wed, 22 Aug 2012 09:00:43 -0700
From:	Philip Rakity <prakity@...vell.com>
To:	Doug Anderson <dianders@...omium.org>
CC:	Jaehoon Chung <jh80.chung@...sung.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Olof Johansson <olof@...om.net>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Thomas P Abraham <thomas.ab@...sung.com>,
	Chris Ball <cjb@...top.org>,
	Will Newton <will.newton@...tec.com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	James Hogan <james.hogan@...tec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/2] mmc: core: Add a capability for disabling mmc cards


On Aug 22, 2012, at 8:44 AM, Doug Anderson <dianders@...omium.org> wrote:

> Jaehoon,
> 
> On Tue, Aug 21, 2012 at 9:35 PM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
>> 
>> Hi Doug,
>> 
>> I didn't know what purpose is.
>> Why need to add the MMC_CAP2_NO_MMC?
>> If card is SD or SDIO, mmc_attach_mmc(host) should not be entered.
>> Could you explain to me in more detail?
> 
> Thanks for your feedback.  In this case I have a card that is an MMC
> card so mmc_attach_sdio() and mmc_attach_sd() will fail.  If I let
> mmc_attach_mmc() run it will actually find the MMC card.  However, on
> this platform it is not valid to recognize MMC cards.
> 


Understand.   

Can you explain why the change is needed.  Is it for technical 
reasons that MMC is not allowed -- if so then I do not understand how SD can work
and MMC cannot.

If it is for marketing reasons -- then --- oh well .....


Could you add some additional comments to the commit message.
I think it makes sense to handle all 3 cases
a) SDIO not allowed
b) SD not allowed
c) MMC not allowed

> -Doug
> --
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