linux-kernel - Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for Arasan NAND Flash Controller

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Message-ID: <20190627182742.6389d772@xps13>
Date:   Thu, 27 Jun 2019 18:27:42 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Naga Sureshkumar Relli <nagasureshkumarrelli@...il.com>
Cc:     Naga Sureshkumar Relli <nagasure@...inx.com>,
        "robh@...nel.org" <robh@...nel.org>,
        "martin.lund@...p-it-simple.com" <martin.lund@...p-it-simple.com>,
        "richard@....at" <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "nagasuresh12@...il.com" <nagasuresh12@...il.com>,
        Michal Simek <michals@...inx.com>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>
Subject: Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for
 Arasan NAND Flash Controller

Hi Naga,

Naga Sureshkumar Relli <nagasureshkumarrelli@...il.com> wrote on Tue,
18 Jun 2019 22:44:24 -0600:

> On Mon, Jan 28, 2019 at 10:27:39AM +0100, Miquel Raynal wrote:
> Hi Miquel,
> 
> > Hi Naga,
> > 
> > Naga Sureshkumar Relli <nagasure@...inx.com> wrote on Mon, 28 Jan 2019
> > 06:04:53 +0000:
> >   
> > > Hi Boris & Miquel,
> > > 
> > > Could you please provide your thoughts on this driver to support HW-ECC?
> > > As I said previously, there is no way to detect errors beyond N bit.
> > > I am ok to update the driver based on your inputs.  
> > 
> > We won't support the ECC engine. It simply cannot be used reliably.
> > 
> > I am working on a generic ECC engine object. It's gonna take a few
> > months until it gets merged but after that you could update the
> > controller driver to drop any ECC-related function. Although the ECC  
> 
> Could you please let me know that, when can we expect generic ECC engine
> update in mtd NAND?
> Based on that, i will plan to update the ARASAN NAND driver along with your
> comments mentioned above under this update,
> as you know there is a limiation in ARASAN NAND controller to detect
> ECC errors.
> i am following this series https://patchwork.kernel.org/patch/10838705/

It is gonna take more time than expected. You can stick to the software
engines for now.

Thanks,
Miquèl