Messages in this thread | | | Date | Sat, 10 Aug 2013 00:41:57 -0700 | From | Brian Norris <> | Subject | Re: [PATCH v2 4/4] mtd: gpmi: update the ecc step size for mtd_info{} |
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On Wed, May 15, 2013 at 04:46:46PM +0800, Huang Shijie wrote: > update the ecc step size when we have already get the right value. > > Signed-off-by: Huang Shijie <b32955@freescale.com> > --- > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > index 53180da..bc598e6 100644 > --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c > @@ -1598,6 +1598,7 @@ static int gpmi_pre_bbt_scan(struct gpmi_nand_data *this) > /* Adjust the ECC strength according to the chip. */ > this->nand.ecc.strength = this->bch_geometry.ecc_strength; > this->mtd.ecc_strength = this->bch_geometry.ecc_strength; > + this->mtd.ecc_step = this->bch_geometry.ecc_chunk_size;
Why do you need a special case here for gpmi-nand? GPMI should be initializing nand_ecc_ctrl.size (this->ecc.size) to something meaningful instead of directly setting to 1. Then nand_base will take care of setting mtd.ecc_step.
Along the same line, you shouldn't need to directly override mtd.ecc_strength here; you should be setting this->ecc.strength appropriately.
I see several instances here where gpmi-nand is hacking around nand_base, rather than using its intended infrastructure.
The right way seems to be to avoid nand_scan() directly but instead to use nand_scan_ident() and nand_scan_tail() separately (that's what they're exported for) so that you can initialize any geometry-related options before nand_scan_tail() does the last steps.
In the end, you shouldn't be needing to override this->scan_bbt at all, since you really intend to use the default implementation; you just are doing this to hack around your issues. In fact, I think every use of nand_default_bbt() outside of nand_base is a design mistake.
> this->mtd.bitflip_threshold = this->bch_geometry.ecc_strength; > > /* NAND boot init, depends on the gpmi_set_geometry(). */ >
Brian
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