board: ti: common: board_detect: Fix EEPROM read quirk for 2-byte
EEPROM detection logic in ti_i2c_eeprom_get() involves figuring out
whether addressing is 1-byte or 2-byte. There are currently different
behaviours seen across boards as documented in commit bf6376642fe8
("board: ti: common: board_detect: Fix EEPROM read quirk"). Adding to
the list, we see that there are 2-byte EEPROMs that read properly
with 1-byte addressing with no offset.
For ti_i2c_eeprom_am6_get where eeprom parse operation is dynamic, the
earlier commit d2ab2a2bafd5 ("board: ti: common: board_detect: Fix
EEPROM read quirk for AM6 style data") tried to resolve this by running
ti_i2c_eeprom_get() twice. However this commit along with its former
commit fails on J7 platforms where EEPROM successfully return back the
header on 1-byte addressing and continues to do so until an offset is
introduced. So the second read incorrectly determines the EEPROM as
1-byte addressing.
A more generic solution is introduced here to solve
this issue: 1-byte read without offset and 1-byte read with offset. If
both passes, it follows 1-byte addressing else we proceed with 2-byte
addressing check.
Tested on J721E, J7200, DRA7xx, AM64x
Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Fixes: d2ab2a2bafd5 (board: ti: common: board_detect: Fix EEPROM read quirk for AM6 style data)
Fixes: bf6376642fe8 (board: ti: common: board_detect: Fix EEPROM read quirk)
Tested-By: Matwey V. Kornilov <matwey.kornilov@gmail.com>
1 file changed