Commit Graph

16 Commits

Author SHA1 Message Date
Chuanhong Guo
f183ce35b8
kernel: mtk-bmt: fix usage of _oob_read
_oob_read returns number of bitflips on success while
bbt_nand_read should return 0.

Fixes: 2d49e49b18 ("mediatek: bmt: use generic mtd api")
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2023-01-21 10:54:23 +08:00
Chuanhong Guo
6fa50e26e7 kernel: mtk_bmt: skip bitflip check if threshold isn't set
kernel spi-nand driver leaves this field empty and let mtd set it later.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2022-04-09 21:08:26 +08:00
Felix Fietkau
2a8a333ee9 kernel: mtk_bmt: add debugfs file to attempt repair of remapped sectors
This can be used for sectors that are not physically damaged

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-25 21:11:09 +01:00
Felix Fietkau
06382d1af7 kernel: add support for mediatek NMBM flash mapping support
This NAND flash remapping method is used on newer MediaTek devices with NAND
flash.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-25 21:11:09 +01:00
Felix Fietkau
be1f2b4d9d kernel: mtk_bmt: on error, do not attempt to remap out-of-range blocks
Pass errors to caller instead

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-25 21:11:09 +01:00
Felix Fietkau
7d1e2be160 kernel: mtk_bmt: fix block copying on remap with bmt v2
Copy from the previously mapped block (in case it was remapped already)

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-25 21:11:09 +01:00
Felix Fietkau
b4c7f8c5f7 kernel: mtk_bmt: allow get_mapping_block to return an error
Used by the mapping implementation to indicate that no backing block is
available

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-25 21:11:09 +01:00
Felix Fietkau
601c7b4adb kernel: split up mtk_bmt driver code
Keep a separate source file per variant

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-03-25 21:11:09 +01:00
Felix Fietkau
e2aa04d1e5 kernel: mtk_bmt: add support for the bbt format used on mt7621
This does not have spare blocks for remapping, and it is also not suitable
for random write access. It only skips over bad blocks on linear writes of an
image to a partition. As such, it is really only suitable for the kernel
partition, or other partitions with mostly static data

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
ff6b4f2cfb kernel: mtk_bmt: add abstraction for supporting other formats
Preparation for supporting remapping on MT7621

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
7235c8d00c kernel: mtk_bmt: remap blocks after reaching bitflip threshold
This ensures that blocks are remapped before data becomes corrupt

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
0ddead0897 kernel: mtk_bmt: pass number of bitflips on read to the caller
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
b86452f841 kernel: mtk_bmt: add support for limiting range of remapping
This can be used to support ubi on top of mtk_bmt without reflashing the
boot loader. The boot loader + factory + kernel area is covered, while the
rest is passed through as-is

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
31b6cfb288 kernel: mtk_bmt: extend debug interface
Add support for showing remapped blocks and garbage collecting old
remapped blocks triggered by using the mark_good/mark_bad files

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
fde2421597 kernel: mtk_bmt: fix remapping after read/write failure
Copy from the previous block in order to preserve existing data

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00
Felix Fietkau
bcf91fe884 kernel: move mediatek BMT support patch to generic patches
Preparation for supporting BMT on MT7621. Move source files to the files/
subdirectory in order to simplify maintenance

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-13 18:33:06 +01:00