mmc: mtk-sd: implement waiting for DAT0 line state
With the recent changes on mmc driver, we saw that the boot is ~5 secs longer compared to v2021.07 on mediatek platforms. This regression is seen during mmc_init and caused by the following patch [1]. Indeed since we did not support poll dat0, we fulfilled the condition of [1] and a delay of 500 ms was added for every __mmc_switch call. By adding the support of wait_dat0(), we now don't need to mdelay during mmc_init anymore. [1]: https://patchwork.ozlabs.org/project/uboot/patch/1629192034-64056-1-git-send-email-ye.li@nxp.com/ Signed-off-by:Julien Masson <jmasson@baylibre.com> Reviewed-by:
Jaehoon Chung <jh80.chung@samsung.com>
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