Re: [PATCH v4 14/35] mtd: rawnand: mtk: convert driver to nand_scan()

[xiaolei li <xiaolei.li@mediatek.com>]

On Sat, 2018-07-21 at 19:10 +0200, Boris Brezillon wrote:
> On Fri, 20 Jul 2018 17:15:06 +0200
> Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> 
> > Two helpers have been added to the core to make ECC-related
> > configuration between the detection phase and the final NAND scan. Use
> > these hooks and convert the driver to just use nand_scan() instead of
> > both nand_scan_ident() and nand_scan_tail().
> > 
> > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
> > ---
> >  drivers/mtd/nand/raw/mtk_nand.c | 75 ++++++++++++++++++++++++-----------------
> >  1 file changed, 44 insertions(+), 31 deletions(-)
> > 
> > diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c
> > index 7bc6be3f6ec0..967418f945ea 100644
> > --- a/drivers/mtd/nand/raw/mtk_nand.c
> > +++ b/drivers/mtd/nand/raw/mtk_nand.c
> > @@ -1250,13 +1250,54 @@ static int mtk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
> >  	return 0;
> >  }
> >  
> > +static int mtk_nfc_attach_chip(struct nand_chip *chip)
> > +{
> > +	struct mtd_info *mtd = nand_to_mtd(chip);
> > +	struct device *dev = mtd->dev.parent;
> > +	struct mtk_nfc *nfc = nand_get_controller_data(chip);
> > +	struct mtk_nfc_nand_chip *mtk_nand = to_mtk_nand(chip);
> > +	int len;
> > +	int ret;
> > +
> > +	if (chip->options & NAND_BUSWIDTH_16) {
> > +		dev_err(dev, "16bits buswidth not supported");
> > +		return -EINVAL;
> > +	}
> > +
> > +	/* store bbt magic in page, cause OOB is not protected */
> > +	if (chip->bbt_options & NAND_BBT_USE_FLASH)
> > +		chip->bbt_options |= NAND_BBT_NO_OOB;
> > +
> > +	ret = mtk_nfc_ecc_init(dev, mtd);
> > +	if (ret)
> > +		return ret;
> > +
> > +	ret = mtk_nfc_set_spare_per_sector(&mtk_nand->spare_per_sector, mtd);
> > +	if (ret)
> > +		return ret;
> > +
> > +	mtk_nfc_set_fdm(&mtk_nand->fdm, mtd);
> > +	mtk_nfc_set_bad_mark_ctl(&mtk_nand->bad_mark, mtd);
> > +
> > +	len = mtd->writesize + mtd->oobsize;
> > +	nfc->buffer = devm_kzalloc(dev, len, GFP_KERNEL);
> > +	if (!nfc->buffer)
> > +		return  -ENOMEM;
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct nand_controller_ops mtk_nfc_controller_ops = {
> > +	.attach_chip = mtk_nfc_attach_chip,
> > +};
> > +
> >  static int mtk_nfc_nand_chip_init(struct device *dev, struct mtk_nfc *nfc,
> >  				  struct device_node *np)
> >  {
> >  	struct mtk_nfc_nand_chip *chip;
> >  	struct nand_chip *nand;
> >  	struct mtd_info *mtd;
> > -	int nsels, len;
> > +	int nsels;
> >  	u32 tmp;
> >  	int ret;
> >  	int i;
> > @@ -1287,6 +1328,7 @@ static int mtk_nfc_nand_chip_init(struct device *dev, struct mtk_nfc *nfc,
> >  
> >  	nand = &chip->nand;
> >  	nand->controller = &nfc->controller;
> > +	nand->controller->ops = &mtk_nfc_controller_ops;
> 
> Just like for the marvell driver, this assignment should be moved here
> [1]. 
Agree to this.

> Also, it looks like this driver is open-coding
> nand_controller_init(), probably something we should fix (in a separate
> patch).
May I ask if you mean driver should use nand_hw_control_init helper to
do controller_init?

Thanks,
Xiaolei

> 
> With this fixed:
> 
> Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
> 
> >  
> >  	nand_set_flash_node(nand, np);
> >  	nand_set_controller_data(nand, nfc);
> > @@ -1324,36 +1366,7 @@ static int mtk_nfc_nand_chip_init(struct device *dev, struct mtk_nfc *nfc,
> >  
> >  	mtk_nfc_hw_init(nfc);
> >  
> > -	ret = nand_scan_ident(mtd, nsels, NULL);
> > -	if (ret)
> > -		return ret;
> > -
> > -	/* store bbt magic in page, cause OOB is not protected */
> > -	if (nand->bbt_options & NAND_BBT_USE_FLASH)
> > -		nand->bbt_options |= NAND_BBT_NO_OOB;
> > -
> > -	ret = mtk_nfc_ecc_init(dev, mtd);
> > -	if (ret)
> > -		return -EINVAL;
> > -
> > -	if (nand->options & NAND_BUSWIDTH_16) {
> > -		dev_err(dev, "16bits buswidth not supported");
> > -		return -EINVAL;
> > -	}
> > -
> > -	ret = mtk_nfc_set_spare_per_sector(&chip->spare_per_sector, mtd);
> > -	if (ret)
> > -		return ret;
> > -
> > -	mtk_nfc_set_fdm(&chip->fdm, mtd);
> > -	mtk_nfc_set_bad_mark_ctl(&chip->bad_mark, mtd);
> > -
> > -	len = mtd->writesize + mtd->oobsize;
> > -	nfc->buffer = devm_kzalloc(dev, len, GFP_KERNEL);
> > -	if (!nfc->buffer)
> > -		return  -ENOMEM;
> > -
> > -	ret = nand_scan_tail(mtd);
> > +	ret = nand_scan(mtd, nsels);
> >  	if (ret)
> >  		return ret;
> >  
>