linux-kernel - Re: [PATCH v4 8/9] mtd: rawnand: ingenic: Add support for the JZ4725B

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Date:   Mon, 4 Mar 2019 20:09:47 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 8/9] mtd: rawnand: ingenic: Add support for the
 JZ4725B

Hi Paul,

Paul Cercueil <paul@...pouillou.net> wrote on Mon, 04 Mar 2019 19:30:04
+0100:

> On Mon, Mar 4, 2019 at 11:35 AM, Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> > Hi Paul,
> > 
> > Paul Cercueil <paul@...pouillou.net <mailto:paul@...pouillou.net>> > wrote on Sat,  9 Feb 2019 16:23:04
> > -0300:
> >   
> >>  The boot ROM of the JZ4725B SoC expects a specific OOB layout on the
> >>  NAND, so we use it unconditionally in the ingenic-nand driver.  
> >> >>  Also add the jz4725b-bch driver to support the JZ4725B-specific BCH  
> >>  hardware.  
> >> >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net >> <mailto:paul@...pouillou.net>>  
> >>  ---  
> >> >>  Changes:
> >> >>  v2: Instead of forcing the OOB layout, leave it to the board code or  
> >>      devicetree to decide if the jz4725b-specific layout should be >> used
> >>      or not.  
> >> >>  v3: - Revert the change in v2, as the previous behaviour was >> correct.  
> >>      - Also add support for the hardware BCH of the JZ4725B in this
> >>        patch.  
> >> >>  v4: - Add MODULE_* macros  
> >>      - Add tweaks suggested by upstream feedback  
> >> >>   drivers/mtd/nand/raw/ingenic/Kconfig        |  10 +  
> >>   drivers/mtd/nand/raw/ingenic/Makefile       |   1 +
> >>   drivers/mtd/nand/raw/ingenic/ingenic_nand.c |  48 ++++-
> >>   drivers/mtd/nand/raw/ingenic/jz4725b_bch.c  | 292 >> ++++++++++++++++++++++++++++
> >>   4 files changed, 350 insertions(+), 1 deletion(-)
> >>   create mode 100644 drivers/mtd/nand/raw/ingenic/jz4725b_bch.c  
> >> >   
> > [...]
> >   
> >>  +static int jz4725b_calculate(struct ingenic_ecc *bch,
> >>  +			     struct ingenic_ecc_params *params,
> >>  +			     const u8 *buf, u8 *ecc_code)
> >>  +{
> >>  +	int ret;
> >>  +
> >>  +	mutex_lock(&bch->lock);
> >>  +	ret = jz4725b_bch_init(bch, params, true);  
> > 
> > I really don't like this bch_init name. A BCH initialization is what > is
> > supposed to be done only once (probably at boot time), can you find a
> > better name or a better organization of the correct/calculate path?  
> 
> jz4725b_bch_setup() maybe?

Unless I am not understanding what this does, I don't get why you would
need to do this setup everytime you want to use the ECC engine. Are you
sure this is needed?