SD_SWITCH_SET
err = mmc_sd_switch(card, SD_SWITCH_SET, 0,
err = mmc_sd_switch(card, SD_SWITCH_SET, 2,
err = mmc_sd_switch(card, SD_SWITCH_SET, 0, card->sd_bus_speed, status);
err = mmc_sd_switch(card, SD_SWITCH_SET, 3,