Function mmc_switch

components/drivers/sdio/dev_mmc.c:250–267

* mmc_switch - modify EXT_CSD register * @card: the MMC card associated with the data transfer * @set: cmd set values * @index: EXT_CSD register index * @value: value to program into EXT_CSD register * * Modifies the EXT_CSD register for selected card. */

 *   Modifies the EXT_CSD register for selected card.
 */
static int mmc_switch(struct rt_mmcsd_card *card, rt_uint8_t set,
                      rt_uint8_t index, rt_uint8_t value)
{
    int err;
    struct rt_mmcsd_host *host = card->host;
    struct rt_mmcsd_cmd cmd = {0};

    cmd.cmd_code = SWITCH;
    cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
              (index << 16) | (value << 8) | set;
    cmd.flags = RESP_R1B | CMD_AC;

    err = mmcsd_send_cmd(host, &cmd, 3);
    if (err)
        return err;

    return 0;
}

static int mmc_compare_ext_csds(struct rt_mmcsd_card *card,
                                rt_uint8_t *ext_csd, rt_uint32_t bus_width)