The OOB size of the SK Hynix H27UCG8T2BTR is currently detected to be
640 bytes, while the datasheet states that it should be 1280 bytes.

I only have one single device with a SK Hynix NAND flash, so I cannot
say whether this fix may or may not break other chips. other datasheets
I have checked:
- H27UBG8T2B uses a page size of 8KiB -> not applicable
- H27UBG8T2A also uses a page size of 8KiB -> not applicable either

so I would appreciate if someone else could confirm (even if it's
"just" by looking at a datasheet) that this patch should work for other
SK Hynix NAND chips with 16KiB page size.

I decided not to add a "Fixes" tag because it seems H27UCG8T2BTR was
not supported properly at any point in the past (upstream at least).


changes since v1 at [0]:
- don't apply the fix for all Hynix chips with 16KiB page size as
  suggested by Miquel Raynal
- added an inline comment what the new logic is supposed to do
- I asked Hynix for feedback on my initial patch, unfortunately it
  seems that they cannot disclose any information from the datasheets
  publicly


[0] https://patchwork.ozlabs.org/cover/916836/


Martin Blumenstingl (1):
  mtd: rawnand: hynix: fix decoding the OOB size on H27UCG8T2BTR

 drivers/mtd/nand/raw/nand_hynix.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

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2.18.0