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

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Date:	Sat, 19 Jul 2008 01:01:43 +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 Fri, 18 Jul 2008 15:30:40 +0200
Nicolas Ferre <nicolas.ferre@...el.com> wrote:

> Pierre Ossman :
> > 
> > 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's not really up to the user. The SDIO spec does not mandate 4-bit
support, so some cards will not have it.

> 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.
> 

I haven't seen the erratum, but is there no way to poke the hardware
into getting the interrupt running even in 1-bit mode?

-- 
     -- Pierre Ossman

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