[PATCH 8/8] omap4 hsmmc: Update ocr mask for MMC2 for regulator to use

[tony@atomide.com (Tony Lindgren)]

From: kishore kadiyala <kishore.kadiyala@ti.com>

On OMAP4, MMC2 controller has eMMC which draws power from VAUX regulator
on TWL. Though the eMMC supports dual voltage[1.8v/3v] as per ocr register,
its VCC is fixed at 3V for operation. With this once the mmc core selects
the minimum voltage[1.8] supported based on the ocr value read from OCR register,
eMMC will not get detected. Thus the platform data for MMC2 is updated with ocr
mask and same will be communicated to core which will set the regulator to
always operate at 3V when ever turned ON.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Madhusudhan Chikkature <madhu.cr@ti.com>
Cc: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Kishore Kadiyala <kishore.kadiyala@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/mach-omap2/board-4430sdp.c |    1 +
 drivers/mmc/host/omap_hsmmc.c       |   12 ++++++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/board-4430sdp.c b/arch/arm/mach-omap2/board-4430sdp.c
index cdb9373..9f75dc2 100644
--- a/arch/arm/mach-omap2/board-4430sdp.c
+++ b/arch/arm/mach-omap2/board-4430sdp.c
@@ -242,6 +242,7 @@ static struct omap2_hsmmc_info mmc[] = {
 		.gpio_cd	= -EINVAL,
 		.gpio_wp	= -EINVAL,
 		.nonremovable   = true,
+		.ocr_mask	= MMC_VDD_29_30,
 	},
 	{}	/* Terminator */
 };
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index dc95756..4693e62 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -364,6 +364,7 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 {
 	struct regulator *reg;
 	int ret = 0;
+	int ocr_value = 0;
 
 	switch (host->id) {
 	case OMAP_MMC1_DEVID:
@@ -396,6 +397,17 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 		}
 	} else {
 		host->vcc = reg;
+		ocr_value = mmc_regulator_get_ocrmask(reg);
+		if (!mmc_slot(host).ocr_mask) {
+			mmc_slot(host).ocr_mask = ocr_value;
+		} else {
+			if (!(mmc_slot(host).ocr_mask & ocr_value)) {
+				pr_err("MMC%d ocrmask %x is not supported\n",
+					host->id, mmc_slot(host).ocr_mask);
+				mmc_slot(host).ocr_mask = 0;
+				return -EINVAL;
+			}
+		}
 		mmc_slot(host).ocr_mask = mmc_regulator_get_ocrmask(reg);
 
 		/* Allow an aux regulator */