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

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Date:	Wed, 22 Aug 2012 11:27:59 -0700
From:	Olof Johansson <olof@...om.net>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	Philip Rakity <prakity@...vell.com>,
	Doug Anderson <dianders@...omium.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	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 Wed, Aug 22, 2012 at 11:25 AM, Nicolas Pitre <nico@...xnic.net> wrote:
> On Wed, 22 Aug 2012, Olof Johansson wrote:
>
>> On Wed, Aug 22, 2012 at 9:00 AM, Philip Rakity <prakity@...vell.com> wrote:
>> >
>> > On Aug 22, 2012, at 8:44 AM, Doug Anderson <dianders@...omium.org> wrote:
>> >
>> >> 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
>>
>> We are working with a system manufacturer who wishes to only support
>> SD cards in their product, and need to accommodate that. It made sense
>> for us to contribute this work upstream since others might want to do
>> the same in the future for some reason.
>>
>> Adding all three cases makes sense if others foresee a use case for it.
>
> Isn't this rather revolting?
>
> Personally I find such "feature" totally ridiculous. If said
> manufacturer doesn't want to support MMC cards, they just have to not
> advertise it, period.  Or if they really mean it, then they only have to
> state it explicitly in their user manual, and repeat it if ever problems
> are reported.
>
> Dumbing down kernel functionality to serve marketing purpose or
> technology lock-ins is utterly stupid.  Purposely restricting
> interoperability might even be ruled illegal in some jurisdictions.
>
> I therefore insist on providing a vehement NAK on such patches.

Ok, thanks. We'll keep carrying it locally instead then.


-Olof
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