diff --git a/arch/arm/mach-rk30/board-rk3168-86v-sdmmc-config.c b/arch/arm/mach-rk30/board-rk3168-86v-sdmmc-config.c
index d7a110af3df4..b873bba667bb 100755
--- a/arch/arm/mach-rk30/board-rk3168-86v-sdmmc-config.c
+++ b/arch/arm/mach-rk30/board-rk3168-86v-sdmmc-config.c
@@ -38,6 +38,21 @@
 */
 #define RK29SDK_SD_CARD_PWR_EN                  RK30_PIN3_PA1
 #define RK29SDK_SD_CARD_PWR_EN_LEVEL            GPIO_LOW 
+int rk31sdk_get_sdmmc0_pin_io_voltage(void)
+{
+    int voltage;
+#define RK31SDK_SET_SDMMC0_PIN_VOLTAGE
+
+    /**************************************************************************************
+    **  Please tell me how much voltage of your SDMMC0-pin in your project. 
+    **
+    **     例如: 有的项目，它的SDMMC0所在的RK主控的IO组，想用1.8V, 而卡本身用3.3V, 
+    **  而中间通过个电平转换.那么，您此时，应该设置下面的voltage值为 1.8V(即1800mv)
+    ***************************************************************************************/
+    voltage = 3300;  //default the voltage 3300mv. 
+
+    return voltage;
+}
 
 /*
 * define the card-detect-pin.
@@ -117,23 +132,25 @@
     #endif // #if COMBO_MODULE_MT6620_CDT--#endif
 #endif 
 
-double rk31sdk_get_sdio_wifi_voltage(void)
+int rk31sdk_get_sdio_wifi_voltage(void)
 {
-    double voltage;
+    int voltage;
     
     /******************************************************************************
     **  Please tell me how much wifi-module uses voltage in your project.  
     ******************************************************************************/
 #if defined(CONFIG_BCM4329) || defined(CONFIG_BCM4319) || defined(CONFIG_RK903) || defined(CONFIG_RK901)
-    voltage = 1.8 ; //power 1.8V
+    voltage = 1800 ; //power 1800mV
     
-#elif defined(CONFIG_MT5931_MT6622)||defined(CONFIG_MT5931)||defined(CONFIG_MT6620)
-    voltage = 2.8 ; //power 2.8V
+#elif defined(CONFIG_MT5931_MT6622)||defined(CONFIG_MT5931)
+    voltage = 1800 ; //power 1800V
+#elif defined(CONFIG_MT6620) 
+    voltage = 2800 ; //power 2800V
 #elif defined(CONFIG_RDA5990)||defined(CONFIG_RTL8723AS)  
-    voltage = 3.3 ; //power 3.3V
+    voltage = 3300 ; //power 3300V
 #else
     //default, sdio use 3.0V
-    voltage = 3.0 ; //power 3.0V
+    voltage = 3000 ; //power 3000V
 #endif
 
     return voltage;