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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>
This commit is contained in:
Balaji T K 2011-05-30 19:55:34 +05:30 committed by Tony Lindgren
parent e68273baf3
commit b1c1df7a7d
5 changed files with 11 additions and 0 deletions
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1
arch/arm/mach-omap2/board-4430sdp.c
View File

@ -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,

3
arch/arm/mach-omap2/hsmmc.c
View File

@ -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;

1
arch/arm/mach-omap2/hsmmc.h
View File

@ -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 */

3
arch/arm/plat-omap/include/plat/mmc.h
View File

@ -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;

3
drivers/mmc/host/omap_hsmmc.c
View File

@ -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