mmc: sdhci: Use regulator min/max voltage range according to spec

For regulator vmmc/vmmcq, use voltage range as below
3.3v/3.0v: (2.7v, 3.6v)
1.8v: (1.7v, 1.95v)
Original code uses the precise value which may fail in regulator
driver if it does NOT support the precise voltage.

Signed-off-by: Jialing Fu <jlfu@marvell.com>
Signed-off-by: Kevin Liu <kliu5@marvell.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2f62fe4..ec3e984 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1618,7 +1618,7 @@ static int sdhci_do_3_3v_signal_voltage_switch(struct sdhci_host *host,
        sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
 
        if (host->vqmmc) {
-               ret = regulator_set_voltage(host->vqmmc, 3300000, 3300000);
+               ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000);
                if (ret) {
                        pr_warning("%s: Switching to 3.3V signalling voltage "
                                   " failed\n", mmc_hostname(host->mmc));
@@ -1662,7 +1662,7 @@ static int sdhci_do_1_8v_signal_voltage_switch(struct sdhci_host *host,
                 */
                if (host->vqmmc)
                        ret = regulator_set_voltage(host->vqmmc,
-                               1800000, 1800000);
+                               1700000, 1950000);
                else
                        ret = 0;
 
@@ -2860,8 +2860,8 @@ int sdhci_add_host(struct sdhci_host *host)
                }
        } else {
                regulator_enable(host->vqmmc);
-               if (!regulator_is_supported_voltage(host->vqmmc, 1800000,
-                       1800000))
+               if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
+                       1950000))
                        caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
                                        SDHCI_SUPPORT_SDR50 |
                                        SDHCI_SUPPORT_DDR50);
@@ -2925,16 +2925,14 @@ int sdhci_add_host(struct sdhci_host *host)
 
 #ifdef CONFIG_REGULATOR
        if (host->vmmc) {
-               ret = regulator_is_supported_voltage(host->vmmc, 3300000,
-                       3300000);
+               ret = regulator_is_supported_voltage(host->vmmc, 2700000,
+                       3600000);
                if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330)))
                        caps[0] &= ~SDHCI_CAN_VDD_330;
-               ret = regulator_is_supported_voltage(host->vmmc, 3000000,
-                       3000000);
                if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300)))
                        caps[0] &= ~SDHCI_CAN_VDD_300;
-               ret = regulator_is_supported_voltage(host->vmmc, 1800000,
-                       1800000);
+               ret = regulator_is_supported_voltage(host->vmmc, 1700000,
+                       1950000);
                if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180)))
                        caps[0] &= ~SDHCI_CAN_VDD_180;
        }