[PATCH v4] mtd: gpmi: fix the bch setting backward compatible issue

[Miquel Raynal]

Hi Han,

han.xu at nxp.com wrote on Fri, 25 Mar 2022 08:36:38 -0500:

> Previous u-boot code changed the default bch setting behavior and caused
> backward compatible issue. This fix choose the legacy bch geometry back
> again as the default option. If the minimum ecc strength that NAND chips
> required need to be chosen, it can be enabled by either adding DT flag
> "fsl,use-minimum-ecc" or CONFIG_NAND_MXS_USE_MINIMUM_ECC in configs. The
> unused flag "fsl,legacy-bch-geometry" get removed.
> 
> Fixes: 51cdf83eea (mtd: gpmi: provide the option to use legacy bch geometry)
> Fixes: 616f03daba (mtd: gpmi: change the BCH layout setting for large oob NAND)
> Tested-by: Tim Harvey <tharvey at gateworks.com>
> Tested-by: Sean Nyekjaer <sean at geanix.com>
> Signed-off-by: Han Xu <han.xu at nxp.com>
> 

One nit below.

> +void mxs_nand_dump_geo(struct mtd_info *mtd)
> +{
> +	struct nand_chip *nand = mtd_to_nand(mtd);
> +	struct mxs_nand_info *nand_info = nand_get_controller_data(nand);
> +	struct bch_geometry *geo = &nand_info->bch_geometry;
> +
> +	dev_dbg(mtd->dev, "BCH Geometry :\n"
> +		"GF Length\t\t: %u\n"
> +		"ECC Strength\t\t: %u\n"
> +		"ECC for Meta\t\t: %u\n"
> +		"ECC Chunk0 Size\t\t: %u\n"
> +		"ECC Chunkn Size\t\t: %u\n"
> +		"ECC Chunk Count\t\t: %u\n"
> +		"Block Mark Byte Offset\t: %u\n"
> +		"Block Mark Bit Offset\t: %u\n",
> +		geo->gf_len,
> +		geo->ecc_strength,
> +		geo->ecc_for_meta,
> +		geo->ecc_chunk0_size,
> +		geo->ecc_chunkn_size,
> +		geo->ecc_chunk_count,
> +		geo->block_mark_byte_offset,
> +		geo->block_mark_bit_offset);
>  }
>  
>  /*
> @@ -1159,6 +1210,8 @@ int mxs_nand_setup_ecc(struct mtd_info *mtd)
>  	if (ret)
>  		return ret;
>  
> +	mxs_nand_dump_geo(mtd);
> +
>  	/* Configure BCH and set NFC geometry */
>  	mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
>  

The above addition should not be part of the commit fixing the
situation, they should be in a separate patch.

With this fixed,

Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>

Thanks,
Miquèl