linux-kernel - Re: [PATCH 7/7] mmc_spi: support for non-byte-aligned cards

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Message-ID: <200903111942.49341.rgetz@blackfin.uclinux.org>
Date:	Wed, 11 Mar 2009 19:42:49 -0400
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Will Newton" <will.newton@...il.com>
CC:	Wolfgang Mües <wolfgang.mues@...rswald.de>,
	"Pierre Ossman" <drzeus@...eus.cx>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Matt Fleming" <matt@...sole-pimps.org>,
	"David Brownell" <dbrownell@...rs.sourceforge.net>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] mmc_spi: support for non-byte-aligned cards

On Wed 11 Mar 2009 11:03, Will Newton pondered:
> On Wed, Mar 11, 2009 at 3:00 PM, Wolfgang Mües
> <wolfgang.mues@...rswald.de> wrote:
> > Will,
> >
> > Am Mittwoch, 11. März 2009 schrieb Will Newton:
> >> Are they using the same host controller? Have you tried these cards
> >> with a different host controller?
> >
> > I have tried with 3 different spi host controllers.
> >
> >> Are you clocking them particularly slow or fast?
> >
> > 400 KHz, 20 MHz and 25 MHz.
> >
> >> A logic probe may not display any signal integrity issues you might have.
> >
> > My "logic probe" is a 1 GHz leCroy DSO.
> >
> > I am doing this for money, and I am no amateur.
> 
> Ok, sure, but these are things that are best put in your changleogs so
> people can understand what hardware is problematic and how it is
> proven.
> 
> I have not seen these problems or seen them reported by others.
> Hopefully they will speak up and confirm your results.

We have seen the same issues, and have had various Blackfin users report the 
same with a select number of cards. (including Kingston cards that Wolfgang 
referenced).

A few (who also had ARM platforms) said they saw the same on different SPI 
controllers - so I don't think it is a Blackfin specific issue.

-Robin
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