Suspend/resume without bringing down SDIO

[Dongas]

2009/9/21, Chris Ball <cjb at laptop.org>:
> Hi,
>
>   > Is there any story behind that why all cards must be powered down
>   > during suspend?
>
> Just that the common case for SD cards is that they contain filesystems,
> and those cards should be unmounted and powered off during suspend
> because there's no point in leaving them on, and it can be dangerous
> to the filesystem to do so.  The Linux SD stack is still new enough
> that it hasn't yet grown the ability to differentiate cards that
> should stay powered in suspend and cards that shouldn't.
Got it.

> (That said, see Nicolas Pitre's recent patches on the linux-mmc@ list,
> which attempt to solve this SDIO problem.)

Thanks.
I will check it.

Regards
Dognas

>   > There're real cases that some SDIO WiFi cards indeed DO NOT like
>   > to be powered down during suspend, e.g they want to enter deep
>   > sleep.
>
> Yes.
>
> - Chris.
> --
> Chris Ball   <cjb at laptop.org>
> One Laptop Per Child
>