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

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Date:   Wed, 12 Dec 2018 09:11:35 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Naga Sureshkumar Relli <nagasure@...inx.com>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        "robh@...nel.org" <robh@...nel.org>,
        "richard@....at" <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.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>
Subject: Re: [LINUX PATCH v12 3/3] mtd: rawnand: arasan: Add support for
 Arasan NAND Flash Controller

Hi Naga,

Naga Sureshkumar Relli <nagasure@...inx.com> wrote on Wed, 12 Dec 2018
05:27:03 +0000:

> Hi Boris & Miquel,
> 
> An update to my comments on thread https://lkml.org/lkml/2018/11/15/656.
> In this I said, will take a default error count value as 16 and during page read, will check the error count
> Register value with this and if it is equal to or greater than the default count(16) then I am checking for
> Erased pages.
> But bit[7:0] in ECC_Error_Count_Register(0x38) will update for each error occurred.
> Link: https://www.xilinx.com/html_docs/registers/ug1087/ug1087-zynq-ultrascale-registers.html and
> check for NAND module, ECC_Error_Count_Register.
> 
> I mean previously I dependent on Total error count value (bit[16:8]), but we can simply check for bit[7:0]
> To see the error occurred or not. 
> I tried with this approach and I don't see any issues with that.
> I ran ubifs with this and I am able to see the bit[7:0] count is updated for erased page read and then will
> Use nand_chech_erased_ecc_chunk() to see the bitflips.
> 
> If it is ok, I will update the driver and will send new patch, but do you have any other comments on v12?

Is 'nandbiterrs -i' running correctly now?

Thanks,
Miquèl