Re: Putting the sdhci to sleep safely [with attachments]

From: Tony Mobily
Date: Mon Dec 25 2006 - 20:21:19 EST


> (Please always cc: linux-kernel@ with such stuff).

Gosh, alright. I am gonna embarrass myself here, but I guess this is
part of the game...! :-D

>> I am the Editor In Chief of Free Software Magazine
>> (
>> I am in a bit of a mission: I would like to see the module sdhci put my
>> card reader to sleep without getting the system highly
>> unstable. This is
> Well, suspend works for me, and my machine seems to have sdhci:
> 0000:15:00.2 0805: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host
> Adapter (rev 18)

Alright, that's what I have as well...

0a:01.1 Generic system peripheral [0805]: Ricoh Co Ltd R5C822
SD/SDIO/MMC/MS/MSPro Host Adapter (rev 19)

>> Pierre Ossman, the maintainer of the sdhci module, wrote to me:
>> "Anyway, as far as I know, this isn't a bug in the driver, so there is
>> not very much I can do. The problem is somewhere in the PCI interaction,
>> but I've sent numerous mail to the kernel PCI hackers, but have yet to
>> receive a single reply."
> I've certainly not seen such a mail.

OK. I guess there was a bit of a communication problem here. I am more
than happy to

> Can you get info what is wrong
> with that, and cc lkml, me and greg?

Sure thing!

>> So, here I am... please find attache my lspci and the log of what
>> happens when the computer is put to sleep.
>> I would also be happy to organise a bounty for this bug to be fixed.
> :-). Just hunt it yourself. It is probably easier than organizing a bounty.

OK. I had a look at the code, and I foind it depressing. Not because it
was bad, but because it reminded me of how hopeless I am!
I can do my best to get you guys to communicate, *and* to get some
testing done - I am more than happy to spend as long as it takes
testing, compiling patches, and putting my laptop to sleep over and over
and over again. But coding... nope. Not on *this* code...

> Ouch... you failed to mention what kernel you are using?

I told you I'd embarrass myself...

Linux merc-laptop 2.6.19-7-generic #2 SMP Mon Dec 4 16:46:19 UTC 2006
i686 GNU/Linux

I am trying to gather some information - will report back to you ASAP.

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