Re: 2.6.35.6 fails to suspend (pxa2xx-mci.0)

Sven Neumann
2010-10-09T23:20:19Z

On Sat, 2010-10-09 at 03:07 +0200, Ohad Ben-Cohen wrote:
> On Fri, Oct 8, 2010 at 10:08 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > There is a problem with the pxa2xx-mci.0 suspend that has been introduced
> > some time after 2.6.34, but it is not related to commit 152e1d5920.
>
> Sven, what type of card do you have in that slot ? is it SDIO ? what's
> the function driver ?
>
> I have a hunch about this, but it may be a wild guess as I don't know
> what's your setup exactly.
>
> Anyway, can you please try this and see if anything changes ?
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index c94565d..515ff39 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1682,6 +1682,19 @@ int mmc_suspend_host(struct mmc_host *host)
> if (host->bus_ops && !host->bus_dead) {
> if (host->bus_ops->suspend)
> err = host->bus_ops->suspend(host);
> + if (err == -ENOSYS || !host->bus_ops->resume) {
> + /*
> + * We simply "remove" the card in this case.
> + * It will be redetected on resume.
> + */
> + if (host->bus_ops->remove)
> + host->bus_ops->remove(host);
> + mmc_claim_host(host);
> + mmc_detach_bus(host);
> + mmc_release_host(host);
> + host->pm_flags = 0;
> + err = 0;
> + }
> }
> mmc_bus_put(host);
>
> The reason I'm asking this is because it seems like commit
> 4c2ef25fe0b847d2ae818f74758ddb0be1c27d8e "mmc: fix all hangs related
> to mmc/sd card insert/removal during suspend/resume" has broken
> suspending SDIO function drivers which don't have a suspend handler
> (or do have one, but for some reason it returns -ENOSYS, like
> libertas_sdio's does).

That is exactly our setup (libertas over sdio). I will try your patch as
soon as I get to the office on Monday morning and report back.

Thanks,
Sven