mtk android sd卡调试

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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, };