[PATCH 01/11] mmc: host: omap_hsmmc: Support vmmc_aux to switch to 1.8v

Kishon Vijay Abraham I
2015-07-30T07:47:08Z

Add support for vmmc_aux to switch to 1.8v. Also use "iov" instead of
"vdd" to indicate io voltage. This is in preparation for adding support
for io signal voltage switch.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/mmc/host/omap_hsmmc.c | 47 +++++++++++++++++++++++++++--------------
1 file changed, 31 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 6d52873..09e949f 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -243,10 +243,11 @@ static int omap_hsmmc_get_cover_state(struct device *dev)
return mmc_gpio_get_cd(host->mmc);
}

-static int omap_hsmmc_enable_supply(struct mmc_host *mmc)
+static int omap_hsmmc_enable_supply(struct mmc_host *mmc, int iov)
{
int ret;
struct mmc_ios *ios = &mmc->ios;
+ int uvoltage;

if (mmc->supply.vmmc) {
ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
@@ -255,7 +256,24 @@ static int omap_hsmmc_enable_supply(struct mmc_host *mmc)
}

/* Enable interface voltage rail, if needed */
- if (mmc->supply.vqmmc && !regulator_is_enabled(mmc->supply.vqmmc)) {
+ if (mmc->supply.vqmmc) {
+ if (regulator_is_enabled(mmc->supply.vqmmc)) {
+ ret = regulator_disable(mmc->supply.vqmmc);
+ if (ret) {
+ dev_err(mmc_dev(mmc),
+ "vmmc_aux reg disable failed\n");
+ goto err_vqmmc;
+ }
+ }
+
+ uvoltage = (iov == VDD_165_195) ? VDD_1V8 : VDD_3V0;
+ ret = regulator_set_voltage(mmc->supply.vqmmc, uvoltage,
+ uvoltage);
+ if (ret) {
+ dev_err(mmc_dev(mmc), "vmmc_aux set voltage failed\n");
+ goto err_vqmmc;
+ }
+
ret = regulator_enable(mmc->supply.vqmmc);
if (ret) {
dev_err(mmc_dev(mmc), "vmmc_aux reg enable failed\n");
@@ -304,22 +322,19 @@ err_set_ocr:
}

static int omap_hsmmc_set_pbias(struct omap_hsmmc_host *host, bool power_on,
- int vdd)
+ int iov)
{
int ret;
+ int uvoltage;

if (!host->pbias)
return 0;

if (power_on) {
- if (vdd <= VDD_165_195)
- ret = regulator_set_voltage(host->pbias, VDD_1V8,
- VDD_1V8);
- else
- ret = regulator_set_voltage(host->pbias, VDD_3V0,
- VDD_3V0);
- if (ret < 0) {
- dev_err(host->dev, "pbias set voltage fail\n");
+ uvoltage = (iov <= VDD_165_195) ? VDD_1V8 : VDD_3V0;
+ ret = regulator_set_voltage(host->pbias, uvoltage, uvoltage);
+ if (ret) {
+ dev_err(host->dev, "pbias set voltage failed\n");
return ret;
}

@@ -343,7 +358,7 @@ static int omap_hsmmc_set_pbias(struct omap_hsmmc_host *host, bool power_on,
return 0;
}

-static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
+static int omap_hsmmc_set_power(struct device *dev, int power_on, int iov)
{
struct omap_hsmmc_host *host =
platform_get_drvdata(to_platform_device(dev));
@@ -358,7 +373,7 @@ static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
return 0;

if (mmc_pdata(host)->before_set_reg)
- mmc_pdata(host)->before_set_reg(dev, power_on, vdd);
+ mmc_pdata(host)->before_set_reg(dev, power_on, iov);

ret = omap_hsmmc_set_pbias(host, false, 0);
if (ret)
@@ -378,11 +393,11 @@ static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
* chips/cards need an interface voltage rail too.
*/
if (power_on) {
- ret = omap_hsmmc_enable_supply(mmc);
+ ret = omap_hsmmc_enable_supply(mmc, iov);
if (ret)
return ret;

- ret = omap_hsmmc_set_pbias(host, true, vdd);
+ ret = omap_hsmmc_set_pbias(host, true, iov);
if (ret)
goto err_set_voltage;
} else {
@@ -392,7 +407,7 @@ static int omap_hsmmc_set_power(struct device *dev, int power_on, int vdd)
}

if (mmc_pdata(host)->after_set_reg)
- mmc_pdata(host)->after_set_reg(dev, power_on, vdd);
+ mmc_pdata(host)->after_set_reg(dev, power_on, iov);

return 0;

--
1.7.9.5