linux-kernel - Re: [PATCH v4 1/9] mtd: rawnand: denali: use nand

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Date:   Mon, 1 Apr 2019 19:14:19 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Boris Brezillon <boris.brezillon@...labora.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-mtd@...ts.infradead.org,
        Brian Norris <computersforpeace@...il.com>,
        linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Boris Brezillon <bbrezillon@...nel.org>
Subject: Re: [PATCH v4 1/9] mtd: rawnand: denali: use nand_chip pointer more
 for internal functions

Hi Masahiro,

Boris Brezillon <boris.brezillon@...labora.com> wrote on Sat, 30 Mar
2019 15:23:23 +0100:

> On Fri, 29 Mar 2019 16:28:13 +0900
> Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:
> 
> > With the recent refactoring, the NAND driver hooks now take a pointer
> > to nand_chip. Add to_denali() in order to convert (struct nand_chip *)
> > to (struct denali_nand_info *) directly. It is more useful than the
> > current mtd_to_denali().
> > 
> > I changed some helper functions to take (struct nand_chip *). This will
> > avoid pointer conversion back and forth, and ease further development.
> > 
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > ---
> > 
> > Changes in v4: None
> > Changes in v3: None
> > Changes in v2: None
> > 
> >  drivers/mtd/nand/raw/denali.c | 57 ++++++++++++++++++++++++-------------------
> >  1 file changed, 32 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
> > index 24aeafc..4ac1314 100644
> > --- a/drivers/mtd/nand/raw/denali.c
> > +++ b/drivers/mtd/nand/raw/denali.c
> > @@ -47,6 +47,11 @@ static inline struct denali_nand_info *mtd_to_denali(struct mtd_info *mtd)
> >  	return container_of(mtd_to_nand(mtd), struct denali_nand_info, nand);
> >  }
> >  
> > +static struct denali_nand_info *to_denali(struct nand_chip *chip)
> > +{
> > +	return container_of(chip, struct denali_nand_info, nand);
> > +}
> > +
> >  /*
> >   * Direct Addressing - the slave address forms the control information (command
> >   * type, bank, block, and page address).  The slave data is the actual data to
> > @@ -282,12 +287,12 @@ static void denali_cmd_ctrl(struct nand_chip *chip, int dat, unsigned int ctrl)
> >  	denali->host_write(denali, DENALI_BANK(denali) | type, dat);
> >  }
> >  
> > -static int denali_check_erased_page(struct mtd_info *mtd,
> > -				    struct nand_chip *chip, uint8_t *buf,
> > +static int denali_check_erased_page(struct nand_chip *chip,
> > +				    struct denali_nand_info *denali, u8 *buf,  
> 
> You don't need to pass both chip and denali, as one can be extracted
> from the other.
> 
> >  				    unsigned long uncor_ecc_flags,
> >  				    unsigned int max_bitflips)
> >  {
> > -	struct denali_nand_info *denali = mtd_to_denali(mtd);
> > +	struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
> >  	uint8_t *ecc_code = chip->oob_poi + denali->oob_skip_bytes;
> >  	int ecc_steps = chip->ecc.steps;
> >  	int ecc_size = chip->ecc.size;
> > @@ -303,9 +308,9 @@ static int denali_check_erased_page(struct mtd_info *mtd,
> >  						  NULL, 0,
> >  						  chip->ecc.strength);
> >  		if (stat < 0) {
> > -			mtd->ecc_stats.failed++;
> > +			ecc_stats->failed++;
> >  		} else {
> > -			mtd->ecc_stats.corrected += stat;
> > +			ecc_stats->corrected += stat;
> >  			max_bitflips = max_t(unsigned int, max_bitflips, stat);
> >  		}
> >  
> > @@ -316,11 +321,11 @@ static int denali_check_erased_page(struct mtd_info *mtd,
> >  	return max_bitflips;
> >  }
> >  
> > -static int denali_hw_ecc_fixup(struct mtd_info *mtd,
> > +static int denali_hw_ecc_fixup(struct nand_chip *chip,
> >  			       struct denali_nand_info *denali,  
> 
> Ditto.
> 

I am fine with the series in its current state, please submit a v5
with Boris comment's addressed and I'll queue it right away to next.

Thanks,
Miquèl