linux-kernel - RE: [PATCH 2/6] mtd: diskonchip: don't call nand_scan

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Date:	Thu, 23 Apr 2015 00:30:34 +0000
From:	Peter Pan 潘栋 (peterpandong) 
	<peterpandong@...ron.com>
To:	Brian Norris <computersforpeace@...il.com>
CC:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/6] mtd: diskonchip: don't call nand_scan_bbt() directly

On Thu, Apr 23, 2015 at 01:51:27PM +0000, Brian Norris wrote:
> 
> On Thu, Apr 16, 2015 at 02:11:24AM +0000, Peter Pan 潘栋 (peterpandong)
> wrote:
> > The diskonchip driver almost uses the default nand_base hooks as-is,
> > except that it provides custom on-flash BBT descriptors and avoids
> using
> > factory-marked bad blockers.
> >
> > So let's refactor the BBT initialization code into a private
> 'late_init'
> > hook which handles all the private details. Note the usage of
> > NAND_SKIP_BBTSCAN, which allows us to defer the BBT scan until we've
> > prepared everything.
> >
> > Signed-off-by: Brian Norris <computersforpeace@...il.com>
> > Signed-off-by: Peter Pan <peterpandong@...ron.com>
> 
> Why are you just resending my patch? You could Ack/Review/Test it
> instead. (Did you test it?)

My work is in the 6th patch.
I already tested the patch with micron own nand controller. I don't have
platform with docg4 or diskonchip controller. So the BBT and nand_base.c
part is covered while docg4.c and diskonchip.c not.

> http://patchwork.ozlabs.org/patch/444605/
> 
> > ---
> >  drivers/mtd/nand/diskonchip.c | 27 ++++++++++++++++-----------
> >  1 file changed, 16 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/diskonchip.c
> b/drivers/mtd/nand/diskonchip.c
> > index f68a7bc..e580014 100644
> > --- a/drivers/mtd/nand/diskonchip.c
> > +++ b/drivers/mtd/nand/diskonchip.c
> > @@ -69,6 +69,9 @@ struct doc_priv {
> >  	int mh0_page;
> >  	int mh1_page;
> >  	struct mtd_info *nextdoc;
> > +
> > +	/* Handle the last stage of initialization (BBT scan,
> partitioning) */
> > +	int (*late_init)(struct mtd_info *mtd);
> >  };
> >
> >  /* This is the syndrome computed by the HW ecc generator upon
> reading an empty
> > @@ -1294,10 +1297,10 @@ static int __init nftl_scan_bbt(struct
> mtd_info *mtd)
> >  		this->bbt_md = NULL;
> >  	}
> >
> > -	/* It's safe to set bd=NULL below because NAND_BBT_CREATE is not
> set.
> > -	   At least as nand_bbt.c is currently written. */
> > -	if ((ret = nand_scan_bbt(mtd, NULL)))
> > +	ret = this->scan_bbt(mtd);
> > +	if (ret)
> >  		return ret;
> > +
> >  	mtd_device_register(mtd, NULL, 0);
> >  	if (!no_autopart)
> >  		mtd_device_register(mtd, parts, numparts);
> > @@ -1344,10 +1347,10 @@ static int __init inftl_scan_bbt(struct
> mtd_info *mtd)
> >  		this->bbt_md->pattern = "TBB_SYSM";
> >  	}
> >
> > -	/* It's safe to set bd=NULL below because NAND_BBT_CREATE is not
> set.
> > -	   At least as nand_bbt.c is currently written. */
> > -	if ((ret = nand_scan_bbt(mtd, NULL)))
> > +	ret = this->scan_bbt(mtd);
> > +	if (ret)
> >  		return ret;
> > +
> >  	memset((char *)parts, 0, sizeof(parts));
> >  	numparts = inftl_partscan(mtd, parts);
> >  	/* At least for now, require the INFTL Media Header.  We could
> probably
> > @@ -1369,7 +1372,7 @@ static inline int __init doc2000_init(struct
> mtd_info *mtd)
> >  	this->read_byte = doc2000_read_byte;
> >  	this->write_buf = doc2000_writebuf;
> >  	this->read_buf = doc2000_readbuf;
> > -	this->scan_bbt = nftl_scan_bbt;
> > +	doc->late_init = nftl_scan_bbt;
> >
> >  	doc->CDSNControl = CDSN_CTRL_FLASH_IO | CDSN_CTRL_ECC_IO;
> >  	doc2000_count_chips(mtd);
> > @@ -1396,13 +1399,13 @@ static inline int __init doc2001_init(struct
> mtd_info *mtd)
> >  		   can have multiple chips. */
> >  		doc2000_count_chips(mtd);
> >  		mtd->name = "DiskOnChip 2000 (INFTL Model)";
> > -		this->scan_bbt = inftl_scan_bbt;
> > +		doc->late_init = inftl_scan_bbt;
> >  		return (4 * doc->chips_per_floor);
> >  	} else {
> >  		/* Bog-standard Millennium */
> >  		doc->chips_per_floor = 1;
> >  		mtd->name = "DiskOnChip Millennium";
> > -		this->scan_bbt = nftl_scan_bbt;
> > +		doc->late_init = nftl_scan_bbt;
> >  		return 1;
> >  	}
> >  }
> > @@ -1415,7 +1418,7 @@ static inline int __init
> doc2001plus_init(struct mtd_info *mtd)
> >  	this->read_byte = doc2001plus_read_byte;
> >  	this->write_buf = doc2001plus_writebuf;
> >  	this->read_buf = doc2001plus_readbuf;
> > -	this->scan_bbt = inftl_scan_bbt;
> > +	doc->late_init = inftl_scan_bbt;
> >  	this->cmd_ctrl = NULL;
> >  	this->select_chip = doc2001plus_select_chip;
> >  	this->cmdfunc = doc2001plus_command;
> > @@ -1591,6 +1594,8 @@ static int __init doc_probe(unsigned long
> physadr)
> >  	nand->ecc.bytes		= 6;
> >  	nand->ecc.strength	= 2;
> >  	nand->bbt_options	= NAND_BBT_USE_FLASH;
> > +	/* Skip the automatic BBT scan so we can run it manually */
> > +	nand->options		|= NAND_SKIP_BBTSCAN;
> >
> >  	doc->physadr		= physadr;
> >  	doc->virtadr		= virtadr;
> > @@ -1608,7 +1613,7 @@ static int __init doc_probe(unsigned long
> physadr)
> >  	else
> >  		numchips = doc2001_init(mtd);
> >
> > -	if ((ret = nand_scan(mtd, numchips))) {
> > +	if ((ret = nand_scan(mtd, numchips)) || (ret = doc-
> >late_init(mtd))) {
> >  		/* DBB note: i believe nand_release is necessary here, as
> >  		   buffers may have been allocated in nand_base.  Check
> with
> >  		   Thomas. FIX ME! */
> > --
> > 1.9.1
> >