Re: [PATCH 2/2] mmc: core: reset sdio card properly on resume.

NeilBrown
2014-11-11T00:17:53Z

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On Mon, 10 Nov 2014 14:29:19 +0100 Ulf Hansson <ulf.hansson@linaro.org> wrote:

> On 8 November 2014 01:14, NeilBrown <neilb@suse.de> wrote:
> > mmc_sdio_power_restore calls
> > mmc_send_if_cond(host, host->ocr_avail);
> >
> > ret = mmc_send_io_op_cond(host, 0, NULL);
> >
> > between mmc_go_idle() and mmc_sdio_init_card().
> > mmc_sdio_resume needs to as well, else my libertas sdio wifi
> > device doesn't resume properly from suspend.
> >
> > Signed-off-by: NeilBrown <neilb@suse.de>
> > ---
> > drivers/mmc/core/sdio.c | 8 ++++++--
> > 1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> > index e636d9e99e4a..3f069a6f448f 100644
> > --- a/drivers/mmc/core/sdio.c
> > +++ b/drivers/mmc/core/sdio.c
> > @@ -981,8 +981,12 @@ static int mmc_sdio_resume(struct mmc_host *host)
> > if (mmc_card_is_removable(host) || !mmc_card_keep_power(host)) {
> > sdio_reset(host);
> > mmc_go_idle(host);
> > - err = mmc_sdio_init_card(host, host->card->ocr, host->card,
> > - mmc_card_keep_power(host));
> > + mmc_send_if_cond(host, host->ocr_avail);
>
> /s /host->ocr_avail /host->card->ocr
>
> I would expect that to work. I do realize that "host->ocr_avail" is
> being used in the ->power_restore() callback, but I think that's wrong
> as well. Could you maybe verify that changing to host->card->ocr works
> in this path as well? That's would of course be a separate patch.

Hi Ulf,
I made the substitution in mmc_sdio_resume and mmc_sdio_power_restore
and my sdio device continues to work, including after resume.

The host->card->ocr value is 0x10000, the host->ocr_avail value is 0x18000.

If you like I'll send the two patches formally, but it might be a day or so.

Thanks,
NeilBrown

>
> > + err = mmc_send_io_op_cond(host, 0, NULL);
> > + if (!err)
> > + err = mmc_sdio_init_card(host, host->card->ocr,
> > + host->card,
> > + mmc_card_keep_power(host));
> > } else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
> > /* We may have switched to 1-bit mode during suspend */
> > err = sdio_enable_4bit_bus(host->card);
> >
> >
>
> Kind regards
> Uffe

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