tree 805e543b2e15f06cb5ccd27ea68e5dc08624efd8
parent b247d02e285ddcb5b628ef60be955ed5238e2a57
author Julien Masson <jmasson@baylibre.com> 1636119254 +0100
committer Tom Rini <trini@konsulko.com> 1637186699 -0500

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>