linux-kernel - Re: [PATCH 1/3] at91_mci: Enable MMC_CAP_SDIO

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Date:	Fri, 18 Jul 2008 15:30:40 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Pierre Ossman <drzeus@...eus.cx>
CC:	ARM Linux Mailing List <linux-arm-kernel@...ts.arm.linux.org.uk>,
	Andrew Victor <linux@...im.org.za>,
	Ville Syrjala <syrjala@....fi>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] at91_mci: Enable MMC_CAP_SDIO_IRQ only when it actually
 works

Pierre Ossman :
> On Thu, 17 Jul 2008 11:34:07 +0200
> Nicolas Ferre <nicolas.ferre@...el.com> wrote:
> 
>> According to the datasheets AT91SAM9261 does not support
>> SDIO interrupts, and AT91SAM9260/9263 have an erratum
>> requiring 4bit mode while using slot B for the interrupt
>> to work.
>>
>> Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
>> ---
> 
> Not all SDIO cards use 4-bit mode, so it looks to me like you have to
> disable it completely (unless there's a third revision where it works
> without any fine print?).

Well, I understand.

In your opinion, a printed warning that says to be sure to use only 
4-bit mode SDIO cards on slot B... is not acceptable ?

It kind of disappoints me to remove this feature as the 
at91sam9260ek/9xe/9g20 board uses only slot B, and I really like to 
connect SDIO with IRQ on it.

Regards,
-- 
Nicolas Ferre

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