Hi Dmitry,
[Cc += Nico]
On Mon, Feb 14, 2011 at 11:04:13AM -0800, Dmitry Shmidt wrote:
> MMC_UNSAFE_RESUME is affecting mmc_sdio_resume() sequence. If it is
> not defined then sdio card will be considered
> "removable" and on resume mmc_sdio_init_card() will be always called.
>
> static int mmc_sdio_resume(struct mmc_host *host)
> {
> ...
> if (mmc_card_is_removable(host) || !mmc_card_is_powered_resumed(host))
> err = mmc_sdio_init_card(host, host->ocr, host->card,
> (host->pm_flags & MMC_PM_KEEP_POWER));
mmc_sdio_init_card() is supposed to be called if your card is removable,
because the card might have changed. It has a fast path that's enabled
by MMC_PM_KEEP_POWER. (Nicolas explained this back in October.)
You absolutely should not enable MMC_UNSAFE_RESUME if your host has a
removable card. It's an awful hack, and you just found an example of
where it breaks.
If you need mmc_sdio_resume() to have an even faster path for you, we can
talk about that and see if it makes sense. Misusing MMC_UNSAFE_RESUME to
get a powered SDIO resume is just wrong.
Thanks,
--
Chris Ball <[email protected]> <http://printf.net/>
One Laptop Per Child
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