Re: [PATCH 5/5] SDIO: put active devices into 1-bit mode during suspend

Chris Ball
2010-02-10T16:34:25Z

Hi David,

> I couldn't find anything in the SDIO specification (you know the
> section number?). Part A2 has a requirement that the controller
> be placed into 1-bit mode but this doesn't mean that the card has
> to be.

I think it's part E1 section 8, and does specify that it's necessary
for both host and card.

> Maybe it's not really a big deal, a single command only costs a
> few 10s of microseconds anyway.

Yeah, and it's only being sent on a powered-suspend, which so far OLPC
is the only user of -- I'd rather have the next user tell us it isn't
necessary than break it for them by introducing an incorrect quirk.

Thanks,

- Chris.
--
Chris Ball <cjb@laptop.org>
One Laptop Per Child