Commit 516d5ccd authored by Ohad Ben-Cohen's avatar Ohad Ben-Cohen Committed by Chris Ball
Browse files

mmc: add runtime PM handlers 



Add MMC runtime PM handlers, which call mmc_power_save_host
and mmc_power_restore_host in response to runtime_suspend and
runtime_resume events.

Runtime PM is still disabled by default, so this patch alone
has no immediate effect.

Signed-off-by: default avatarOhad Ben-Cohen <ohad@wizery.com>
Tested-by: default avatarLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent d3fe37b1

drivers/mmc/core/bus.c

+37 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/device.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>



#include <linux/mmc/card.h>

#include <linux/mmc/host.h>
@@ -141,6 +142,41 @@ static int mmc_bus_resume(struct device *dev) 
	return ret;

}



#ifdef CONFIG_PM_RUNTIME



static int mmc_runtime_suspend(struct device *dev)

{

	struct mmc_card *card = mmc_dev_to_card(dev);



	return mmc_power_save_host(card->host);

}



static int mmc_runtime_resume(struct device *dev)

{

	struct mmc_card *card = mmc_dev_to_card(dev);



	return mmc_power_restore_host(card->host);

}



static int mmc_runtime_idle(struct device *dev)

{

	return pm_runtime_suspend(dev);

}



static const struct dev_pm_ops mmc_bus_pm_ops = {

	.runtime_suspend	= mmc_runtime_suspend,

	.runtime_resume		= mmc_runtime_resume,

	.runtime_idle		= mmc_runtime_idle,

};



#define MMC_PM_OPS_PTR	(&mmc_bus_pm_ops)



#else /* !CONFIG_PM_RUNTIME */



#define MMC_PM_OPS_PTR	NULL



#endif /* !CONFIG_PM_RUNTIME */



static struct bus_type mmc_bus_type = {

	.name		= "mmc",

	.dev_attrs	= mmc_dev_attrs,
@@ -150,6 +186,7 @@ static struct bus_type mmc_bus_type = { 
	.remove		= mmc_bus_remove,

	.suspend	= mmc_bus_suspend,

	.resume		= mmc_bus_resume,

	.pm		= MMC_PM_OPS_PTR,

};



int mmc_register_bus(void)

CRA Git | Maintained and supported by SUSTech CRA and CCSE