omap_hsmmc: Allow for power saving without going off

An eMMC may be always powered on, so that the lowest
power saving state possible is sleeping. Add a field
to the platform data to indicate that.
Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/hsmmc.c

@@ -202,6 +202,9 @@ void __init omap2_hsmmc_init(struct omap2_hsmmc_info *controllers)
 		if (c->power_saving)
 			mmc->slots[0].power_saving = 1;
 
+		if (c->no_off)
+			mmc->slots[0].no_off = 1;
+
 		/* NOTE:  MMC slots should have a Vcc regulator set up.
 		 * This may be from a TWL4030-family chip, another
 		 * controllable regulator, or a fixed supply.

arch/arm/mach-omap2/hsmmc.h

@@ -14,6 +14,7 @@ struct omap2_hsmmc_info {
 	bool	cover_only;	/* No card detect - just cover switch */
 	bool	nonremovable;	/* Nonremovable e.g. eMMC */
 	bool	power_saving;	/* Try to sleep or power off when possible */
+	bool	no_off;		/* power_saving and power is not to go off */
 	int	gpio_cd;	/* or -EINVAL */
 	int	gpio_wp;	/* or -EINVAL */
 	char	*name;		/* or NULL for default */

arch/arm/plat-omap/include/plat/mmc.h

@@ -96,6 +96,9 @@ struct omap_mmc_platform_data {
 		/* Try to sleep or power off when possible */
 		unsigned power_saving:1;
 
+		/* If using power_saving and the MMC power is not to go off */
+		unsigned no_off:1;
+
 		int switch_pin;			/* gpio (card detect) */
 		int gpio_wp;			/* gpio (write protect) */
 

drivers/mmc/host/omap_hsmmc.c

@@ -1656,6 +1656,9 @@ static int omap_hsmmc_disabled_to_sleep(struct omap_hsmmc_host *host)
 	dev_dbg(mmc_dev(host->mmc), "DISABLED -> %s\n",
 		host->dpm_state == CARDSLEEP ? "CARDSLEEP" : "REGSLEEP");
 
+	if (mmc_slot(host).no_off)
+		return 0;
+
 	if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
 	    mmc_slot(host).card_detect ||
 	    (mmc_slot(host).get_cover_state &&
@@ -1671,6 +1674,9 @@ static int omap_hsmmc_sleep_to_off(struct omap_hsmmc_host *host)
 	if (!mmc_try_claim_host(host->mmc))
 		return 0;
 
+	if (mmc_slot(host).no_off)
+		return 0;
+
 	if (!((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
 	      mmc_slot(host).card_detect ||
 	      (mmc_slot(host).get_cover_state &&