Re: [PATCH for 4.9.y 2/2] mtd: cfi_cmdset_0002: Use chip_ready() for write on S29GL064N

[Greg KH <gregkh@linuxfoundation.org>]

On Sat, Jun 11, 2022 at 12:56:04AM +0900, 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.
> 
> Link: https://lore.kernel.org/r/b687c259-6413-26c9-d4c9-b3afa69ea124@pengutronix.de/
> Fixes: dfeae1073583("mtd: cfi_cmdset_0002: Change write buffer to check correct value")
> Cc: stable@vger.kernel.org
> Signed-off-by: Tokunori Ikegami <ikegami.t@gmail.com>
> Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Link: https://lore.kernel.org/linux-mtd/20220323170458.5608-3-ikegami.t@gmail.com
> ---
>  drivers/mtd/chips/cfi_cmdset_0002.c | 42 +++++++++++++++++++++++------
>  include/linux/mtd/cfi.h             |  1 +
>  2 files changed, 35 insertions(+), 8 deletions(-)

All now queued up, thanks.

greg k-h