Message ID | 1368607606-4344-5-git-send-email-b32955@freescale.com |
---|---|
State | New, archived |
Headers | show |
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
On Sat, Aug 10, 2013 at 12:41 AM, Brian Norris <computersforpeace@gmail.com> wrote: > 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 Correction: should be this->nand.ecc.size > 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. Correction: should be this->nand.ecc.strength. And another correction: you are already setting this field, but you are doing it in the wrong place. > 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(). */ >> Sorry for the above mistakes, but the argument still holds. In fact, it's somewhat stronger, because gpmi-nand has to assign the same information to two different (redundant) fields (this->nand.ecc.strength and this->mtd.ecc_strength) because it is not using the proper layering here. Brian
于 2013年08月10日 03:53, Brian Norris 写道: > 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. i agree with you. I will create a v3 version tomorrow when i back to office. thanks for the review. Huang Shijie
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; this->mtd.bitflip_threshold = this->bch_geometry.ecc_strength; /* NAND boot init, depends on the gpmi_set_geometry(). */
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(-)