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Commit faf5d4d5 authored by Julien Masson's avatar Julien Masson Committed by Tom Rini
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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: default avatarJulien Masson <jmasson@baylibre.com>
Reviewed-by: default avatarJaehoon Chung <jh80.chung@samsung.com>
parent 55de0c19
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