linux-kernel - Re: mmc_spi stopped working

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Message-ID: <20071022200335.7c1eca12@poseidon.drzeus.cx>
Date:	Mon, 22 Oct 2007 20:03:35 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: mmc_spi stopped working

On Wed, 17 Oct 2007 12:37:13 -0700
David Brownell <david-b@...bell.net> wrote:

> When enumerating MMC cards using SPI, don't support the "just probe"
> mechanism since it doesn't always work.  Instead, always wait for the
> reset to complete before issuing the next request.
> 
> This is a regression ... this SanDisk MMC card used to enumerate with
> no trouble, despite this particular spec violation.
> 

I've been testing a bit more here, and I can't get this particular bug. I have others though:

Out of my five MMC cards, only two work properly. One doesn't respond to SPI commands at all, and two hang on a second CMD0 and return ILLEGAL_COMMAND on a second run of CMD1. All of this is of course wildly out of spec. SPI seems to be a bonus, not a given. :/

As for your card, could you send me a dump as I'm unable to produce the issue here?

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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