[PATCH v7 0/4] mtd: cfi_cmdset_0002: Use chip_ready() for write on S29GL064N

[Thorsten Leemhuis]

Hi, this is your Linux kernel regression tracker. Top-posting for once,
to make this easily accessible to everyone.

Miquel, Richard, Vignesh: what's up here? This patchset fixes a
regression. It's quite old, so it's not that urgent, but it looked like
nothing happened for two and a half week now. Or was progress made
somewhere?

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I'm getting a lot of
reports on my table. I can only look briefly into most of them and lack
knowledge about most of the areas they concern. I thus unfortunately
will sometimes get things wrong or miss something important. I hope
that's not the case here; if you think it is, don't hesitate to tell me
in a public reply, it's in everyone's interest to set the public record
straight.

#regzbot poke

On 23.03.22 18:04, Tokunori Ikegami wrote:
> Since commit dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to
> check correct value") buffered writes fail on S29GL064N. This is
> because, on S29GL064N, reads return 0xFF at the end of DQ polling for
> write completion, where as, chip_good() check expects actual data
> written to the last location to be returned post DQ polling completion.
> Fix is to revert to using chip_good() for S29GL064N which only checks
> for DQ lines to settle down to determine write completion.
> 
> Fixes: dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value")
> Signed-off-by: Tokunori Ikegami <ikegami.t at gmail.com>
> Cc: stable at vger.kernel.org
> Link: https://lore.kernel.org/r/b687c259-6413-26c9-d4c9-b3afa69ea124@pengutronix.de/
> 
> Tokunori Ikegami (4):
>   mtd: cfi_cmdset_0002: Move and rename
>     chip_check/chip_ready/chip_good_for_write
>   mtd: cfi_cmdset_0002: Use chip_ready() for write on S29GL064N
>   mtd: cfi_cmdset_0002: Add S29GL064N ID definition
>   mtd: cfi_cmdset_0002: Rename chip_ready variables
> 
>  drivers/mtd/chips/cfi_cmdset_0002.c | 112 ++++++++++++++--------------
>  include/linux/mtd/cfi.h             |   1 +
>  2 files changed, 55 insertions(+), 58 deletions(-)
>