> -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap- > owner@xxxxxxxxxxxxxxx] On Behalf Of Adrian Hunter > Sent: Tuesday, July 28, 2009 5:39 AM > To: Andrew Morton > Cc: Jarkko Lavinen; Adrian Hunter; linux-omap Mailing List; Pierre Ossman; > Denis Karpov; Matt Fleming; lkml > Subject: [PATCH V2 4/32] mmc: add ability to save power by powering off > cards > > From e6355578d082d94707c8fda1e1342c478019b5c8 Mon Sep 17 00:00:00 2001 > From: Adrian Hunter <adrian.hunter@xxxxxxxxx> > Date: Mon, 11 May 2009 12:20:57 +0300 > Subject: [PATCH] mmc: add ability to save power by powering off cards > > Power can be saved by powering off cards that are not > in use. This is similar to suspend / resume except > it is under the control of the driver, and does not > require any power management support. It can only > be used when the driver can monitor whether the card > is removed, otherwise it is unsafe. This is possible > because, unlike suspend, the driver still receives > card detect and / or cover switch interrupts. > > Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > --- > drivers/mmc/core/core.c | 34 ++++++++++++++++++++++++++++++++++ > drivers/mmc/core/core.h | 2 ++ > drivers/mmc/core/mmc.c | 11 +++++++++++ > drivers/mmc/core/sd.c | 11 +++++++++++ > include/linux/mmc/host.h | 3 +++ > 5 files changed, 61 insertions(+), 0 deletions(-) > > diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c > index bab5015..39f7bd1 100644 > --- a/drivers/mmc/core/core.c > +++ b/drivers/mmc/core/core.c > @@ -1145,6 +1145,40 @@ void mmc_stop_host(struct mmc_host *host) > mmc_power_off(host); > } > > +void mmc_power_save_host(struct mmc_host *host) > +{ > + mmc_bus_get(host); > + > + if (!host->bus_ops || host->bus_dead || !host->bus_ops- > >power_restore) { > + mmc_bus_put(host); > + return; > + } > + > + if (host->bus_ops->power_save) > + host->bus_ops->power_save(host); > + > + mmc_bus_put(host); > + > + mmc_power_off(host); > +} > +EXPORT_SYMBOL(mmc_power_save_host); > + > +void mmc_power_restore_host(struct mmc_host *host) > +{ > + mmc_bus_get(host); > + > + if (!host->bus_ops || host->bus_dead || !host->bus_ops- > >power_restore) { > + mmc_bus_put(host); > + return; > + } > + > + mmc_power_up(host); > + host->bus_ops->power_restore(host); > + > + mmc_bus_put(host); > +} > +EXPORT_SYMBOL(mmc_power_restore_host); > + Who calls these exported functions " mmc_power_save_host" and " mmc_power_restore_host"? > #ifdef CONFIG_PM > > /** > diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h > index c819eff..f7eb4c4 100644 > --- a/drivers/mmc/core/core.h > +++ b/drivers/mmc/core/core.h > @@ -20,6 +20,8 @@ struct mmc_bus_ops { > void (*detect)(struct mmc_host *); > void (*suspend)(struct mmc_host *); > void (*resume)(struct mmc_host *); > + void (*power_save)(struct mmc_host *); > + void (*power_restore)(struct mmc_host *); > }; > > void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops > *ops); > diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c > index 3e35075..01f7226 100644 > --- a/drivers/mmc/core/mmc.c > +++ b/drivers/mmc/core/mmc.c > @@ -549,6 +549,14 @@ static void mmc_resume(struct mmc_host *host) > > } > > +static void mmc_power_restore(struct mmc_host *host) > +{ > + host->card->state &= ~MMC_STATE_HIGHSPEED; > + mmc_claim_host(host); > + mmc_init_card(host, host->ocr, host->card); > + mmc_release_host(host); > +} > + > #ifdef CONFIG_MMC_UNSAFE_RESUME > > static const struct mmc_bus_ops mmc_ops = { > @@ -556,6 +564,7 @@ static const struct mmc_bus_ops mmc_ops = { > .detect = mmc_detect, > .suspend = mmc_suspend, > .resume = mmc_resume, > + .power_restore = mmc_power_restore, > }; > > static void mmc_attach_bus_ops(struct mmc_host *host) > @@ -570,6 +579,7 @@ static const struct mmc_bus_ops mmc_ops = { > .detect = mmc_detect, > .suspend = NULL, > .resume = NULL, > + .power_restore = mmc_power_restore, > }; > > static const struct mmc_bus_ops mmc_ops_unsafe = { > @@ -577,6 +587,7 @@ static const struct mmc_bus_ops mmc_ops_unsafe = { > .detect = mmc_detect, > .suspend = mmc_suspend, > .resume = mmc_resume, > + .power_restore = mmc_power_restore, > }; > > static void mmc_attach_bus_ops(struct mmc_host *host) > diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c > index 80cccd2..debe26e 100644 > --- a/drivers/mmc/core/sd.c > +++ b/drivers/mmc/core/sd.c > @@ -603,6 +603,14 @@ static void mmc_sd_resume(struct mmc_host *host) > > } > > +static void mmc_sd_power_restore(struct mmc_host *host) > +{ > + host->card->state &= ~MMC_STATE_HIGHSPEED; > + mmc_claim_host(host); > + mmc_sd_init_card(host, host->ocr, host->card); > + mmc_release_host(host); > +} > + > #ifdef CONFIG_MMC_UNSAFE_RESUME > > static const struct mmc_bus_ops mmc_sd_ops = { > @@ -610,6 +618,7 @@ static const struct mmc_bus_ops mmc_sd_ops = { > .detect = mmc_sd_detect, > .suspend = mmc_sd_suspend, > .resume = mmc_sd_resume, > + .power_restore = mmc_sd_power_restore, > }; > > static void mmc_sd_attach_bus_ops(struct mmc_host *host) > @@ -624,6 +633,7 @@ static const struct mmc_bus_ops mmc_sd_ops = { > .detect = mmc_sd_detect, > .suspend = NULL, > .resume = NULL, > + .power_restore = mmc_sd_power_restore, > }; > > static const struct mmc_bus_ops mmc_sd_ops_unsafe = { > @@ -631,6 +641,7 @@ static const struct mmc_bus_ops mmc_sd_ops_unsafe = { > .detect = mmc_sd_detect, > .suspend = mmc_sd_suspend, > .resume = mmc_sd_resume, > + .power_restore = mmc_sd_power_restore, > }; > > static void mmc_sd_attach_bus_ops(struct mmc_host *host) > diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h > index bb867d2..c1cbe59 100644 > --- a/include/linux/mmc/host.h > +++ b/include/linux/mmc/host.h > @@ -223,6 +223,9 @@ static inline void *mmc_priv(struct mmc_host *host) > extern int mmc_suspend_host(struct mmc_host *, pm_message_t); > extern int mmc_resume_host(struct mmc_host *); > > +extern void mmc_power_save_host(struct mmc_host *host); > +extern void mmc_power_restore_host(struct mmc_host *host); > + > extern void mmc_detect_change(struct mmc_host *, unsigned long delay); > extern void mmc_request_done(struct mmc_host *, struct mmc_request *); > > -- > 1.5.6.3 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
