linux-kernel - Re: [v2] mtd: rawnand: Change calculating of position page containing BBM

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Date:   Fri,  4 Oct 2019 18:04:43 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Piotr Sroka <piotrs@...ence.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Richard Weinberger <richard@....at>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [v2] mtd: rawnand: Change calculating of position page containing BBM

On Tue, 2019-09-24 at 05:54:31 UTC, Piotr Sroka wrote:
> Change calculating of position page containing BBM
> 
> If none of BBM flags are set then function nand_bbm_get_next_page 
> reports EINVAL. It causes that BBM is not read at all during scanning
> factory bad blocks. The result is that the BBT table is build without 
> checking factory BBM at all. For Micron flash memories none of these 
> flags are set if page size is different than 2048 bytes.
> 
> Address this regression by:
> - adding NAND_BBM_FIRSTPAGE chip flag without any condition. It solves
>   issue only for Micron devices.
> - changing the nand_bbm_get_next_page_function. It will return 0 
>   if no of BBM flag is set and page parameter is 0. After that modification
>   way of discovering factory bad blocks will work similar as in kernel 
>   version 5.1.
> 
> Cc: stable@...r.kernel.org
> Fixes: f90da7818b14 (mtd: rawnand: Support bad block markers in first, second or last page)
> Signed-off-by: Piotr Sroka <piotrs@...ence.com>
> Reviewed-by: Frieder Schrempf <frieder.schrempf@...tron.de>

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

Miquel