Seems like this commit fixes the issue:
commit 2b0efe8204ecebbfd766220f1c7ed63f8016b6f7
Author: BOUGH CHEN <haibo.c...@nxp.com>
Date: Mon Jan 7 10:11:29 2019 +0000
mmc: sdhci-esdhc-imx: remove the 100MHz limitation for Strobe DLL
For some eMMC, after switch to HS400ES mode, it need to config the strobe
dll target dealy even if the clock is 50MHZ or 25MHz, otherwise will meet
CMD index/crc error when send CMD13 to check the switch status.
[ 2.473915] IRQ status 0x000a8001
[ 2.473934] mmc2: mmc_select_hs400es failed, error -84
[ 2.473938] mmc2: error -84 whilst initialising MMC card
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https://bugs.launchpad.net/bugs/1818407
Title:
Cant access emmc, error -84
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