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

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Date:	Thu, 17 Jul 2008 12:55:44 +0200
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
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

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?).

Rgds
-- 
     -- Pierre Ossman

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