[MX25][MMC] mmc esdhc failure in 3.3

[Zhu Richard-R65037]

Hi Eric:
I'm on my business trip out of my FSL office, can't reproduce this issue on i.MX25 board now.
Sorry about that.

Best Regards
Richard Zhu

-----Original Message-----
From: Eric Bénard [mailto:eric at eukrea.com] 
Sent: 2012年3月27日 3:58
To: joancarles
Cc: Zhu Richard-R65037; shawn.guo at linaro.org; linux-mmc at vger.kernel.org; Wolfram Sang; linux-arm-kernel at lists.infradead.org
Subject: Re: [MX25][MMC] mmc esdhc failure in 3.3

Hi Joan Carles,

Le Tue, 27 Mar 2012 10:46:45 +0200,
joancarles <joancarles at fqingenieria.es> a écrit :
> >> This is still present, and we have absolutely no idea where to 
> >> continue searching for the solution of the problem. Any pointers? 
> >> Any git trees of mmc driver changes we could try? Anybody else with 
> >> a MX25 that has this issue?
> >>
> > does that attached patch fix your problem ?
> 
> YES, indeed it does to a certain degree. The timeout errors do not 
> occur anymore and I can successfully perform many fs->ops, such as 
> READ, WRITE, UNLINK ... . So thank you very much for this insight 
> through your patch!
> 
> The speed of the card is excruciatingly slow, however. We roughly get 
> between 34KB/s and 64KB/s from a dd if=/dev/zero write to any of the 
> following partitions:
> 
I have the same speed problem here on i.MX25 but still haven't found the reason.
Shawn, Richard : do you have an idea of why the eSDHC is so slow on
i.MX25 ?

Thanks,
Eric