From: xbw <xbw@rock-chips.com>
Date: Thu, 21 Feb 2013 10:58:19 +0000 (+0800)
Subject: SDMMC:
X-Git-Tag: firefly_0821_release~7585
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=877a5394721d2b716c9beb61c952bd3b0b79ed62;p=firefly-linux-kernel-4.4.55.git

SDMMC:
add the control for the voltage of sdmmc0-pin in RK-host gpio group.
---

diff --git a/arch/arm/plat-rk/rk-sdmmc-ops.c b/arch/arm/plat-rk/rk-sdmmc-ops.c
index 6c55ce44daa5..09a88d8f905e 100644
--- a/arch/arm/plat-rk/rk-sdmmc-ops.c
+++ b/arch/arm/plat-rk/rk-sdmmc-ops.c
@@ -805,8 +805,16 @@ static void rk29_sdmmc_set_iomux_mmc0(unsigned int bus_width)
         	rk30_mux_api_set(rksdmmc0_gpio_init.data0_gpio.iomux.name, rksdmmc0_gpio_init.data0_gpio.iomux.fmux);
         	#endif
 
-            //IO voltage(vccio);sdcard must set the voltage to 3.3v
+            //IO voltage(vccio);
+            #ifdef RK31SDK_SET_SDMMC0_PIN_VOLTAGE
+                if(rk31sdk_get_sdmmc0_pin_io_voltage() > 3.0)
+                    SDMMC_write_grf_reg(GRF_IO_CON4, (SDMMC0_IO_VOLTAGE_MASK |SDMMC0_IO_VOLTAGE_33)); //set SDMMC0 pin to 3.3v
+                else
+                    SDMMC_write_grf_reg(GRF_IO_CON4, (SDMMC0_IO_VOLTAGE_MASK |SDMMC0_IO_VOLTAGE_18));//set SDMMC0 pin to 1.8v
+            #else
+            //default set the voltage of SDMMC0 to 3.3V
             SDMMC_write_grf_reg(GRF_IO_CON4, (SDMMC0_IO_VOLTAGE_MASK |SDMMC0_IO_VOLTAGE_33));
+            #endif
     
             //sdmmc drive strength control
             SDMMC_write_grf_reg(GRF_IO_CON2, (SDMMC0_DRIVER_STRENGTH_MASK |SDMMC0_DRIVER_STRENGTH_8MA));