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Commit 0e6d2558 authored by Asutosh Das's avatar Asutosh Das
Browse files

mmc: core: disable runtime-pm if MMC_CAP2_CORE_RUNTIME_PM is not defined 



There is currently no mechanism to disable the runtime-pm
of eMMC/SD card. This patch adds the mechanism to disable
runtime-pm of eMMC/SD if MMC_CAP2_CORE_RUNTIME_PM is not
defined.

It sets the platform, class and card device as RPM_ACTIVE
irrespective of the capability but doesn't enable it.
The card is never runtime-suspended and hence the
corresponding mmc_host and platform device are not
runtime-suspended as well.

A capability MMC_CAP2_CORE_PM is used to select the use
of core power-management framework.

CRs-Fixed: 490021
Signed-off-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
Change-Id: I394a81a889ab7d4f0f0e6fe4b932630e30fc16c9
parent 4a149ed1

drivers/mmc/core/bus.c

+6 −8
Original line number Diff line number Diff line
@@ -413,14 +413,12 @@ int mmc_add_card(struct mmc_card *card) 
#endif

	mmc_init_context_info(card->host);



	if (mmc_use_core_runtime_pm(card->host)) {

	ret = pm_runtime_set_active(&card->dev);

	if (ret)

		pr_err("%s: %s: failed setting runtime active: ret: %d\n",

		       mmc_hostname(card->host), __func__, ret);

		else if (!mmc_card_sdio(card))

	else if (!mmc_card_sdio(card) && mmc_use_core_runtime_pm(card->host))

		pm_runtime_enable(&card->dev);

	}



	if (mmc_card_sdio(card)) {

		ret = device_init_wakeup(&card->dev, true);

drivers/mmc/core/host.c

+9 −11
Original line number Diff line number Diff line
@@ -83,9 +83,8 @@ static int mmc_host_suspend(struct device *dev) 
	int ret = 0;

	unsigned long flags;



	if (!mmc_use_core_runtime_pm(host))

	if (!mmc_use_core_pm(host))

		return 0;



	spin_lock_irqsave(&host->clk_lock, flags);

	/*

	 * let the driver know that suspend is in progress and must
@@ -123,7 +122,7 @@ static int mmc_host_resume(struct device *dev) 
	struct mmc_host *host = cls_dev_to_mmc_host(dev);

	int ret = 0;



	if (!mmc_use_core_runtime_pm(host))

	if (!mmc_use_core_pm(host))

		return 0;



	if (!pm_runtime_suspended(dev)) {
@@ -841,14 +840,13 @@ int mmc_add_host(struct mmc_host *host) 
	WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&

		!host->ops->enable_sdio_irq);



	if (mmc_use_core_runtime_pm(host)) {

	err = pm_runtime_set_active(&host->class_dev);

	if (err)

		pr_err("%s: %s: failed setting runtime active: err: %d\n",

		       mmc_hostname(host), __func__, err);

		else

	else if (mmc_use_core_runtime_pm(host))

		pm_runtime_enable(&host->class_dev);

	}



	err = device_add(&host->class_dev);

	if (err)

		return err;

include/linux/mmc/host.h

+6 −0
Original line number Diff line number Diff line
@@ -326,6 +326,7 @@ struct mmc_host { 


#define MMC_CAP2_HS400_1_8V	(1 << 22)        /* can support */

#define MMC_CAP2_HS400_1_2V	(1 << 23)        /* can support */

#define MMC_CAP2_CORE_PM       (1 << 24)       /* use PM framework */

#define MMC_CAP2_HS400		(MMC_CAP2_HS400_1_8V | \

				 MMC_CAP2_HS400_1_2V)

	mmc_pm_flag_t		pm_caps;	/* supported pm features */
@@ -615,4 +616,9 @@ static inline int mmc_use_core_runtime_pm(struct mmc_host *host) 
	return host->caps2 & MMC_CAP2_CORE_RUNTIME_PM;

}



static inline int mmc_use_core_pm(struct mmc_host *host)

{

	return host->caps2 & MMC_CAP2_CORE_PM;

}



#endif /* LINUX_MMC_HOST_H */