linux-kernel - Re: MMCv4 support (8-bit support missing)

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Date:	Wed, 18 Apr 2007 10:46:52 +0200
From:	Pierre Ossman <drzeus@...eus.cx>
To:	Madhusudhan c <cr.madhusudhan@...il.com>
CC:	linux-kernel@...r.kernel.org, philipl@...rt.org
Subject: Re: MMCv4 support (8-bit support missing)

Madhusudhan c wrote:
> Hi Pierre/philip,
> 

Hi Madhusudhan,

Feel free to add me as cc in the future if you want me to notice your mail ;)

> This is regarding the MMCv4 support that came in as part of the MMC
> core of 2.6.20 linux kernel version.
> 
> The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit
> support seems to be missing from the MMCv4 support implemented by
> Philip Langdale .

As soon as hardware with specs is available we'll start hacking. :)

> To support 8-bit transfers the core needs to implement "bus testing
> procedure". This requires support for CMD19 and CMD14.
> 
> Why is the support for bus testing procedure msiing from the MMCv4 support?
> 

We haven't determined it as necessary, and as Philip commented, most (if not
all) controllers cannot properly support the test.

Rgds
Pierre


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