On Tue, Oct 16, 2012 at 01:10:47, Peter Korsgaard wrote:
> >>>>> Philip, Avinash <avinashphilip@xxxxxx> writes:
>
> > Platforms containing the ELM module can be used to correct errors
> > reported by BCH 4, 8 & 16 bit ECC scheme. For now only 4 & 8 bit
> > support is added.
>
> This sounds odd to me. What about something like:
>
> The ELM hardware module can be used to speedup BCH 4/8/16 ECC scheme
> error correction.
>
> For now only 4 & 8 bit support is added.
Ok I will correct it.
>
>
> > +++ b/drivers/mtd/devices/Makefile
> > @@ -17,8 +17,10 @@ obj-$(CONFIG_MTD_LART) += lart.o
> > obj-$(CONFIG_MTD_BLOCK2MTD) += block2mtd.o
> > obj-$(CONFIG_MTD_DATAFLASH) += mtd_dataflash.o
> > obj-$(CONFIG_MTD_M25P80) += m25p80.o
> > +obj-$(CONFIG_MTD_NAND_OMAP2) += elm.o
>
> You seem to only use it in 4/4 if CONFIG_MTD_NAND_OMAP_BCH is set, so it
> probably makes more sense to use that symbol to not needlessly include
> it if it won't be used.
Ok. This been good.
>
>
> > +static void elm_write_reg(void *offset, u32 val)
> > +{
> > + writel(val, offset);
> > +}
> > +
> > +static u32 elm_read_reg(void *offset)
> > +{
> > + return readl(offset);
> > +}
>
> As written these read/write wrappers don't add anything. How about
> passing struct elm_info and offset as an integer so you can drop
> elm_base from all call sites, E.G.:
>
> static void elm_write_reg(struct elm_info *info, int offset, u32 val)
> {
> writel(val, info->elm_base + offset);
> }
>
Ok, this helps to reduce some indentation levels also.
>
> > +void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
> > + struct elm_errorvec *err_vec)
> > +{
> > + int i;
> > + u8 syndrome[BCH_MAX_ECC_BYTES_PER_SECTOR] = {0}, *syn_p;
>
>
> Why do you need to keep the entire syndrome around? You seem to only use
> it between elm_reverse_eccdata() and elm_load_syndrome(), so it could as
> well be BCH8_ECC_OOB_BYTES long (or rather a multiple of sizeof(u32).
>
> It would also be good to do the shuffeling directly in elm_load_syndrome
> so you don't need the extra copy.
I will check.
>
>
> > + */
> > +
> > +#ifndef __ELM_H
> > +#define __ELM_H
> > +
> > +enum bch_ecc {
> > + BCH4_ECC = 0,
> > + BCH8_ECC,
> > + BCH16_ECC,
>
> It probably makes more sense to not provide the enum value for BCH16 as
> you don't support it.
>
Ok I will remove.
>
> > +};
> > +
Thanks
Avinash
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