mtk android sd卡调试

配置管脚和电源

sd.c

static u32 msdc_sd1_power(u32 on, MT65XX_POWER_VOLTAGE powerVolt)

{

//libin modify for M1-21 on 20120907

#ifdef MTK_EMMC_SUPPORT // sd1 change to VGP

//msdc_ldo_power(on, MT65XX_POWER_LDO_VGP, powerVolt, &g_vgp);

msdc_ldo_power(on, MT65XX_POWER_LDO_VMC, powerVolt, &g_vmc);

#else // VMC

msdc_ldo_power(on, MT65XX_POWER_LDO_VGP, powerVolt, &g_vmc);

//msdc_ldo_power(on, MT65XX_POWER_LDO_VMC, powerVolt, &g_vmc);

#endif

msdc_ldo_power(on, MT65XX_POWER_LDO_VMCH, powerVolt, &g_vmch);

return 0;

}

更改board.c

struct msdc_hw msdc1_hw = {

.clk_src = 1,

.cmd_edge = MSDC_SMPL_FALLING,

.data_edge = MSDC_SMPL_FALLING,

.clk_drv = 0,

.cmd_drv = 0,

.dat_drv = 0,

.data_pins = 4,

.data_offset = 0,

.flags = MSDC_SYS_SUSPEND | MSDC_HIGHSPEED, //libin add for M1-21 on 20120908

//.flags = MSDC_SYS_SUSPEND | MSDC_WP_PIN_EN | MSDC_CD_PIN_EN | MSDC_REMOVABLE| MSDC_HIGHSPEED, //libin del

};

参考如下：

1. 检查硬件设计是否按照参考设计进行；

2. 检查SD Host端供电，即DVDD_MC1的连接；

检查代码：\mediatek\platform\mt6575\kernel\drivers\mmc-host\sd.c

static u32 msdc_sd1_power(u32 on, MT65XX_POWER_VOLTAGE powerVolt)
{

#ifdef MTK_EMMC_SUPPORT // sd1 change to VGP

msdc_ldo_power(on, MT65XX_POWER_LDO_VGP, powerVolt, &g_vgp);

#else // VMC

msdc_ldo_power(on, MT65XX_POWER_LDO_VMC, powerVolt, &g_vmc);

#endif

msdc_ldo_power(on, MT65XX_POWER_LDO_VMCH, powerVolt, &g_vmch);

return 0;

}

3. SD卡是否支持热插拔

根据MSDC1_INSI的连接情况检查\mediatek\custom{project_name}\kernel\core\src\board.c中热插拔的标志（MSDC_CD_PIN_EN | MSDC_REMOVABLE）；

支持热插拔，则添加标志，并配置对应的GPIO；

不支持热插拔，则去除标志，无需配置对应的GPIO。

struct msdc_hw msdc1_hw = {

.clk_src = 1, .cmd_edge = MSDC_SMPL_FALLING, .data_edge = MSDC_SMPL_FALLING, .clk_drv = 0, .cmd_drv = 0, .dat_drv = 0, .data_pins = 4, .data_offset = 0, .flags = MSDC_SYS_SUSPEND | MSDC_WP_PIN_EN | MSDC_HIGHSPEED|MSDC_SPE | MSDC_CD_PIN_EN | MSDC_REMOVABLE,
};