linux-kernel - Re: [Fwd: MMC sub-system: SDIO block-mode with increment address issue]

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Message-ID: <20071120173951.334f7a2f@poseidon.drzeus.cx>
Date:	Tue, 20 Nov 2007 17:39:51 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	djenkins@...sta.co.uk
Cc:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [Fwd: MMC sub-system: SDIO block-mode with increment address
 issue]

On Tue, 20 Nov 2007 14:52:37 +0000
Dean Jenkins <djenkins@...sta.co.uk> wrote:

> Hi Pierre,
> 
> My card driver needed to set the R/W E4MI bit in the Card Capability
> register (0x08) in CCCR (function 0). Perhaps it is unnecessary ?
> 

That bit is pointless given the current design of the MMC layer, so it shouldn't be necessary.

> BTW. It is easy to for the card driver to access function 0 registers by
> doing the following...
> 

Of course. Any driver can do whatever it pleases since it is in kernel space. But you won't make any friends if you keep trying to bypass every system in the kernel. ;)

(Not to mention you'll have a lot more work on your hands.)

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org
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