linux-kernel - Re: [PATCH 4/9] mtd: rawnand: mpc5121: Keep the driver compatible with on-die ECC engines

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Message-Id: <20211015103218.949705-1-miquel.raynal@bootlin.com>
Date:   Fri, 15 Oct 2021 12:32:18 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tudor Ambarus <Tudor.Ambarus@...rochip.com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 4/9] mtd: rawnand: mpc5121: Keep the driver compatible with on-die ECC engines

On Tue, 2021-09-28 at 22:22:43 UTC, Miquel Raynal wrote:
> Following the introduction of the generic ECC engine infrastructure, it
> was necessary to reorganize the code and move the ECC configuration in
> the ->attach_chip() hook. Failing to do that properly lead to a first
> series of fixes supposed to stabilize the situation. Unfortunately, this
> only fixed the use of software ECC engines, preventing any other kind of
> engine to be used, including on-die ones.
> 
> It is now time to (finally) fix the situation by ensuring that we still
> provide a default (eg. software ECC) but will still support different
> ECC engines such as on-die ECC engines if properly described in the
> device tree.
> 
> There are no changes needed on the core side in order to do this, but we
> just need to leverage the logic there which allows:
> 1- a subsystem default (set to Host engines in the raw NAND world)
> 2- a driver specific default (here set to software ECC engines)
> 3- any type of engine requested by the user (ie. described in the DT)
> 
> As the raw NAND subsystem has not yet been fully converted to the ECC
> engine infrastructure, in order to provide a default ECC engine for this
> driver we need to set chip->ecc.engine_type *before* calling
> nand_scan(). During the initialization step, the core will consider this
> entry as the default engine for this driver. This value may of course
> be overloaded by the user if the usual DT properties are provided.
> 
> Fixes: 6dd09f775b72 ("mtd: rawnand: mpc5121: Move the ECC initialization to ->attach_chip()")
> Cc: stable@...r.kernel.org
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next.

Miquel