CTL_SDIF_MODE
sd_ctrl_write16(host, CTL_SDIF_MODE, SDIF_MODE_HS400 |
sd_ctrl_read16(host, CTL_SDIF_MODE));
sd_ctrl_write16(host, CTL_SDIF_MODE, ~SDIF_MODE_HS400 &
sd_ctrl_read16(host, CTL_SDIF_MODE));
sdif_mode = sd_ctrl_read16(host, CTL_SDIF_MODE);
sd_ctrl_write16(host, CTL_SDIF_MODE, sdif_mode);