ARM: OMAP4: MMC: no regulator off during probe for eMMC

eMMC does not handle power off when not in sleep state,
Skip regulator disable during probe when eMMC is
not in known state - state left by bootloader.

Resolves eMMC failure on OMAP4
mmc0: error -110 whilst initialising MMC card

Signed-off-by: Balaji T K <balajitk@ti.com>
Tested-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
Acked-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index 9ea2694..63de2d3 100644 (file)
--- a/arch/arm/mach-omap2/board-4430sdp.c
+++ b/arch/arm/mach-omap2/board-4430sdp.c
@@ -322,6 +322,7 @@ static struct omap2_hsmmc_info mmc[] = {
                .gpio_wp        = -EINVAL,
                .nonremovable   = true,
                .ocr_mask       = MMC_VDD_29_30,
+               .no_off_init    = true,
        },
        {
                .mmc            = 1,

diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
index b2f30be..857f7da 100644 (file)
--- a/arch/arm/mach-omap2/hsmmc.c
+++ b/arch/arm/mach-omap2/hsmmc.c
@@ -331,6 +331,9 @@ static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
        if (c->no_off)
                mmc->slots[0].no_off = 1;
 
+       if (c->no_off_init)
+               mmc->slots[0].no_regulator_off_init = c->no_off_init;
+
        if (c->vcc_aux_disable_is_sleep)
                mmc->slots[0].vcc_aux_disable_is_sleep = 1;
 

diff --git a/arch/arm/mach-omap2/hsmmc.h b/arch/arm/mach-omap2/hsmmc.h
index f119348..f757e78 100644 (file)
--- a/arch/arm/mach-omap2/hsmmc.h
+++ b/arch/arm/mach-omap2/hsmmc.h
@@ -18,6 +18,7 @@ struct omap2_hsmmc_info {
        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 */
+       bool    no_off_init;    /* no power off when not in MMC sleep state */
        bool    vcc_aux_disable_is_sleep; /* Regulator off remapped to sleep */
        int     gpio_cd;        /* or -EINVAL */
        int     gpio_wp;        /* or -EINVAL */

diff --git a/arch/arm/plat-omap/include/plat/mmc.h b/arch/arm/plat-omap/include/plat/mmc.h
index f38fef9..c7b8741 100644 (file)
--- a/arch/arm/plat-omap/include/plat/mmc.h
+++ b/arch/arm/plat-omap/include/plat/mmc.h
@@ -101,6 +101,9 @@ struct omap_mmc_platform_data {
                /* If using power_saving and the MMC power is not to go off */
                unsigned no_off:1;
 
+               /* eMMC does not handle power off when not in sleep state */
+               unsigned no_regulator_off_init:1;
+
                /* Regulator off remapped to sleep */
                unsigned vcc_aux_disable_is_sleep:1;
 

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 259ece0..5b2e215 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -435,6 +435,9 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
                reg = regulator_get(host->dev, "vmmc_aux");
                host->vcc_aux = IS_ERR(reg) ? NULL : reg;
 
+               /* For eMMC do not power off when not in sleep state */
+               if (mmc_slot(host).no_regulator_off_init)
+                       return 0;
                /*
                * UGLY HACK:  workaround regulator framework bugs.
                * When the bootloader leaves a supply active, it's