Re: [Fwd: MMC sub-system: SDIO block-mode with increment addressissue]

[Pierre Ossman]

On Tue, 20 Nov 2007 14:52:37 +0000
Dean Jenkins <djenkins@xxxxxxxxxxxx> 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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