Re: [PATCH v2 5/9] mtd: rawnand: onfi: Define the number of parameter pages

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote on Tue, 28 Apr
2020 11:38:15 +0200:

> On Tue, 28 Apr 2020 11:36:28 +0200
> Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:
> 
> > Hi Boris,
> > 
> > Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> wrote on Sat, 25 Apr
> > 2020 10:25:19 +0200:
> >   
> > > On Fri, 24 Apr 2020 18:40:38 +0200
> > > Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:
> > >     
> > > > Use a macro to define the number of parameter page instead of
> > > > hardcoding it everywhere.
> > > > 
> > > > Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
> > > > ---
> > > >  drivers/mtd/nand/raw/nand_onfi.c | 10 ++++++----
> > > >  1 file changed, 6 insertions(+), 4 deletions(-)
> > > > 
> > > > diff --git a/drivers/mtd/nand/raw/nand_onfi.c b/drivers/mtd/nand/raw/nand_onfi.c
> > > > index 7d9a3130443a..9fe39adbde4c 100644
> > > > --- a/drivers/mtd/nand/raw/nand_onfi.c
> > > > +++ b/drivers/mtd/nand/raw/nand_onfi.c
> > > > @@ -16,6 +16,8 @@
> > > >  
> > > >  #include "internals.h"
> > > >  
> > > > +#define ONFI_PARAM_PAGES 3
> > > > +
> > > >  u16 onfi_crc16(u16 crc, u8 const *p, size_t len)
> > > >  {
> > > >  	int i;
> > > > @@ -156,7 +158,7 @@ int nand_onfi_detect(struct nand_chip *chip)
> > > >  		return 0;
> > > >  
> > > >  	/* ONFI chip: allocate a buffer to hold its parameter page */
> > > > -	p = kzalloc((sizeof(*p) * 3), GFP_KERNEL);
> > > > +	p = kzalloc((sizeof(*p) * ONFI_PARAM_PAGES), GFP_KERNEL);
> > > >  	if (!p)
> > > >  		return -ENOMEM;
> > > >  
> > > > @@ -166,7 +168,7 @@ int nand_onfi_detect(struct nand_chip *chip)
> > > >  		goto free_onfi_param_page;
> > > >  	}
> > > >  
> > > > -	for (i = 0; i < 3; i++) {
> > > > +	for (i = 0; i < ONFI_PARAM_PAGES; i++) {
> > > >  		ret = nand_read_data_op(chip, &p[i], sizeof(*p), true);
> > > >  		if (ret) {
> > > >  			ret = 0;
> > > > @@ -181,8 +183,8 @@ int nand_onfi_detect(struct nand_chip *chip)
> > > >  		}
> > > >  	}
> > > >  
> > > > -	if (i == 3) {
> > > > -		const void *srcbufs[3] = {p, p + 1, p + 2};
> > > > +	if (i == ONFI_PARAM_PAGES) {
> > > > +		const void *srcbufs[ONFI_PARAM_PAGES] = {p, p + 1, p + 2};
> > > >        
> > > 
> > > Maybe initialize the srcbufs array using a for loop so you can easily
> > > change ONFI_PARAM_PAGES without having to touch the code. Looks good
> > > otherwise, so
> > > 
> > > Reviewed-by: Boris Breillon <boris.brezillon@xxxxxxxxxxxxx>
> > >     
> > 
> > Agreed, here is the snippet of code that I changed:
> > 
> > @@ -181,11 +183,15 @@ int nand_onfi_detect(struct nand_chip *chip)
> >                 }
> >         }
> >  
> > -       if (i == 3) {
> > -               const void *srcbufs[3] = {p, p + 1, p + 2};
> > +       if (i == ONFI_PARAM_PAGES) {
> > +               const void *srcbufs[ONFI_PARAM_PAGES];
> > +               int j;  
> 
> 		  ^unsigned int

Ok

> 
> > +
> > +               for (j = 0; j < ONFI_PARAM_PAGES; j++)
> > +                       srcbufs[j] = p + j;
> >  
> >                 pr_warn("Could not find a valid ONFI parameter page, trying bit-wise majority to recover it\n");
> > -               nand_bit_wise_majority(srcbufs, ARRAY_SIZE(srcbufs), p,
> > +               nand_bit_wise_majority(srcbufs, ONFI_PARAM_PAGES, p,
> >                                        sizeof(*p));
> >  
> >                 crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)p, 254);
> > 
> > 
> > 
> > Thanks,
> > Miquèl  
> 

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