On Mon, 30 Jul 2012 12:07:09 +0530 Rajendra Nayak <rnayak@xxxxxx> wrote:
> On Monday 30 July 2012 11:54 AM, NeilBrown wrote:
> > On Mon, 30 Jul 2012 10:50:36 +0530 Rajendra Nayak<rnayak@xxxxxx> wrote:
> >
> >> On Monday 30 July 2012 05:42 AM, NeilBrown wrote:
> >>>
> >>> 1/ if regulator_get fails, return an error. This is important
> >>> if it failed with EPROBE_DEFER, as the probe needs to be
> >>> deferred.
> >>>
> >>> 2/ Don't set .set_power until the regulator has been found, or
> >>> the deferred probe will not bother calling omap_hsmmc_reg_get().
> >>
> >> I am not very sure, but aren't the data structures re-allocated on a
> >> re-probe (after it was deferred) causing .set_power to be lost anyway?
> >>
> >
> > Apparently not - as I needed to make that change before the re-probe would
> > work.
> >
> > Looking at the code to remind myself:
> >
> > #define mmc_slot(host) (host->pdata->slots[host->slot_id])
> >
> > so the slot is inside the platform data which is allocated in
> > omap_hsmmc_init_one, called from omap_hsmmc_init.
> > This is all prior to the probing of the device.
> >
> > So no: once set_power is set, it stays set.
>
> Thanks for the explanation, makes sense.
>
> Acked-by: Rajendra Nayak <rnayak@xxxxxx>
Thanks.
>
> Btw, is the support for re-probe/deferred probe already merged
> now? or are you testing this with some out of tree patches.
deferred-probe works in 3.5.
commit 04bf30115f4ba2beda1efb6cfbae49cdc757f3a9
Author: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Sun Mar 11 13:07:56 2012 +0000
regulator: Support driver probe deferral
makes it work for regulators.
commit d1c3414c2a9d10ef7f0f7665f5d2947cd088c093
Author: Grant Likely <grant.likely@xxxxxxxxxxxx>
Date: Mon Mar 5 08:47:41 2012 -0700
drivercore: Add driver probe deferral mechanism
added the basic mechanism.
GPIOs are also supported in 3.6-rc thanks to
commit e93545763021988def06fbda28fe5da133589a96
Author: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon Jul 9 12:22:56 2012 +0100
gpiolib: Defer failed gpio requests by default
so the omap_hsmmc_late_init() stuff can probably be removed, though I haven't
tried and there might be some subtlety in there that isn't covered by
EPROBE_DEFER
NeilBrown
>
> >
> > Thanks,
> > NeilBrown
> >
> >>>
> >>> Signed-off-by: NeilBrown<neilb@xxxxxxx>
> >>>
> >>> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> >>> index 389a3ee..f052c29 100644
> >>> --- a/drivers/mmc/host/omap_hsmmc.c
> >>> +++ b/drivers/mmc/host/omap_hsmmc.c
> >>> @@ -299,12 +299,12 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
> >>> struct regulator *reg;
> >>> int ocr_value = 0;
> >>>
> >>> - mmc_slot(host).set_power = omap_hsmmc_set_power;
> >>> -
> >>> reg = regulator_get(host->dev, "vmmc");
> >>> if (IS_ERR(reg)) {
> >>> dev_dbg(host->dev, "vmmc regulator missing\n");
> >>> + return PTR_ERR(reg);
> >>> } else {
> >>> + mmc_slot(host).set_power = omap_hsmmc_set_power;
> >>> host->vcc = reg;
> >>> ocr_value = mmc_regulator_get_ocrmask(reg);
> >>> if (!mmc_slot(host).ocr_mask) {
> >
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