linux-kernel - Re: [PATCH v12 2/5] mtd: nand: vf610

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Message-ID: <20150929205727.GP31505@google.com>
Date:	Tue, 29 Sep 2015 13:57:27 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Stefan Agner <stefan@...er.ch>
Cc:	dwmw2@...radead.org, sebastian@...akpoint.cc, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	shawn.guo@...aro.org, kernel@...gutronix.de,
	boris.brezillon@...e-electrons.com, marb@...at.de,
	aaron@...tycactus.com, bpringlemeir@...il.com,
	linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	albert.aribaud@...ev.fr, klimov.linux@...il.com,
	Bill Pringlemeir <bpringlemeir@...ps.com>
Subject: Re: [PATCH v12 2/5] mtd: nand: vf610_nfc: add hardware BCH-ECC
 support

Pushed this patch to l2-mtd.git, as it looks pretty much good. Although,
I'd like raw read support...

On Wed, Sep 02, 2015 at 06:06:34PM -0700, Stefan Agner wrote:
> This adds hardware ECC support using the BCH encoder in the NFC IP.
> The ECC encoder supports up to 32-bit correction by using 60 error
> correction bytes. There is no sub-page ECC step, ECC is calculated
> always accross the whole page (up to 2k pages).
> 
> Limitations:
> - HW ECC: Only 2K page with 64+ OOB.
> - HW ECC: Only 24 and 32-bit error correction implemented.
> 
> Raw writes have been tested using the generic nand_write_page_raw
> implementation. However, raw reads are currently not possible
> because the controller need to know whether we are going to use
> the ECC mode already at NAND_CMD_READ0 command time. At this point
> we do not have the information whether it is a raw read or a
> regular read at driver level...

Hmm, can you get this in ecc.read_page_raw()?
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