linux-kernel - Re: [PATCH][RESEND][mmc/host]:Blackfin SD Host Controller Driver

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Date:	Sun, 3 May 2009 21:09:10 +0200
From:	Pierre Ossman <pierre@...man.eu>
To:	"Cai, Cliff" <Cliff.Cai@...log.com>
Cc:	linux-kernel@...r.kernel.org, "Cliff Cai" <cliffcai.sh@...il.com>
Subject: Re: [PATCH][RESEND][mmc/host]:Blackfin SD Host Controller Driver

On Mon, 27 Apr 2009 09:47:15 +0800
"Cai, Cliff" <Cliff.Cai@...log.com> wrote:

> >
> >If the controller can only do DAT3-detection, then I think 
> >it's best if we put it into polling mode.
> 
> What did you mean the polling mode,using a timer?
> 

The MMC core handles it for you. Just set MMC_CAP_NEEDS_POLL.

> >
> >You cannot index sg lists directly anymore. You have to 
> >iterate over them using the iteration helpers.
> 
> Why?
> 

Because you'll read bogus data otherwise and can even cause a oops. The
sg lists can be linked, which introduces special entries.

Rgds
-- 
     -- Pierre Ossman

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