Re: [PATCH v3] mtd: rawnand: micron: handle on-die "ECC-off" devices correctly

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

On Tue, 2019-07-30 at 13:44:07 UTC, Marco Felsch wrote:
> Some devices are not supposed to support on-die ECC but experience
> shows that internal ECC machinery can actually be enabled through the
> "SET FEATURE (EFh)" command, even if a read of the "READ ID Parameter
> Tables" returns that it is not.
> 
> Currently, the driver checks the "READ ID Parameter" field directly
> after having enabled the feature. If the check fails it returns
> immediately but leaves the ECC on. When using buggy chips like
> MT29F2G08ABAGA and MT29F2G08ABBGA, all future read/program cycles will
> go through the on-die ECC, confusing the host controller which is
> supposed to be the one handling correction.
> 
> To address this in a common way we need to turn off the on-die ECC
> directly after reading the "READ ID Parameter" and before checking the
> "ECC status".
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: dbc44edbf833 ("mtd: rawnand: micron: Fix on-die ECC detection logic")
> Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
> Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes, thanks.

Miquel

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