commit 461fa17970de418a93832f734a595031c0b72128
author Pali Rohár <pali@kernel.org> Thu Apr 13 22:57:48 2023 +0200
committer Stefan Roese <sr@denx.de> Wed May 03 08:39:23 2023 +0200
tree c649d7508d3114b8ef4afd34542c953e245179c2
parent 4ee99d9ff98ba9b57b65fb895504f767dfe14d82

mmc: Read eMMC partition access bits before card reset

eMMC specification in section "Access partitions" says that all reset
events will restore the access bits in PARTITION_CONFIG CSD register to
default User Data Area value (0b000).

So read partition access bits from PARTITION_CONFIG CSD register before
issuing card reset. This allows SPL/U-Boot to get information which eMMC
partition was in use before SPL/U-Boot was booted. For some platforms this
is the way how to determinate boot partition from which BootROM loaded SPL.

Signed-off-by: Pali Rohár <pali@kernel.org>