RE: [PATCH 0/2 v2] mtd: core: NAND erase preparation

["Bean Huo (beanhuo)" <beanhuo@xxxxxxxxxx>]

Hi, 
I don't know why,  I cannot see my patches in the linux-mtd mail list.
please ignore this one, I will re-send.

>-----Original Message-----
>From: Bean Huo [mailto:beanhuo@xxxxxxxxxx]
>Sent: Friday, January 18, 2019 6:04 PM
>To: boris.brezillon@xxxxxxxxxxx; Zoltan Szubbocsev (zszubbocsev)
><zszubbocsev@xxxxxxxxxx>; miquel.raynal@xxxxxxxxxxx; linux-
>mtd@xxxxxxxxxxxxxxxxxxx; richard@xxxxxx; tglx@xxxxxxxxxxxxx
>Cc: Bean Huo (beanhuo) <beanhuo@xxxxxxxxxx>
>Subject: [PATCH 0/2 v2] mtd: core: NAND erase preparation
>
>On some legacy planar 2D Micron NAND devices when a block erase command
>is issued, occasionally even though a block erase operation successfully
>completes and returns a pass status, the flash block may not be completely
>erased. Subsequent operations to this block on very rare cases can result in
>subtle failures or corruption. These extremely rare cases should nevertheless
>be considered.
>
>These rare occurrences have been observed on partially written blocks.
>Partially written blocks are not uncommon with UBI/UBIFS.
>
>To avoid this rare occurrence, we make sure that at least
>15 pages have been programmed to a block before it is erased.
>In case we find that less than 15 pages have been programmed, additional
>pages are programmed in the block. The observation is that additional pages
>rarely need to be written and most of the time UBI/UBIFS erases blocks that
>contain more programmed pages.
>
>Change log:
>
>v1-v2:
>  Rebased V1 to latest Linux kernel.
>  Add erase preparation function pointer in nand_manufacturer_ops.
>
>
>Signed-off-by: Bean Huo <beanhuo@xxxxxxxxxx>
>Reviewed-by: ZOLTAN SZUBBOCSEV <zszubbocsev@xxxxxxxxxx>
>
>Bean Huo (2):
>  mtd: core: add erase preparation hook function pointer
>  mtd: core: NAND filling block
>
> drivers/mtd/nand/raw/internals.h   |   2 +
> drivers/mtd/nand/raw/nand_base.c   |   5 ++
> drivers/mtd/nand/raw/nand_micron.c | 119
>+++++++++++++++++++++++++++++++++++++
> 3 files changed, 126 insertions(+)
>
>--
>2.7.4


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