# Re: \[RFC PATCH 06/10\] mtd: nand: mxic-ecc: Add Macronix external ECC engine support

- From: Miquel Raynal \<miquel.raynal@bootlin.com\>
- Date: 2021-10-15 09:37:50 
- List: linux-devicetree
- Page: https://ratatoskr.run/linux-devicetree/2021/10/1543094
- Thread: https://ratatoskr.run/linux-devicetree/2021/10/1543094/t.md

```text
Hi xiangsheng.hou,

xiangsheng.hou@mediatek.com wrote on Wed, 13 Oct 2021 17:15:49 +0800:

> Hi,
> 
> On Fri, 2021-10-08 at 18:22 +0200, Miquel Raynal wrote:
> > 
> > +static int mxic_ecc_count_biterrs(struct mxic_ecc_engine *eng,
> > struct mtd_info *mtd)
> > +{
> > +	struct device *dev = eng->dev;
> > +	unsigned int max_bf = 0;
> > +	int step;
> > +
> > +	for (step = 0; step < eng->steps; step++) {
> > +		u8 stat = eng->status[step];
> > +
> > +		if (stat == NO_ERR) {
> > +			dev_dbg(dev, "ECC step %d: no error\n", step);
> > +		} else if (stat == ERASED_CHUNK) {
> > +			dev_dbg(dev, "ECC step %d: erased\n", step);
> > +		} else if (stat == UNCORR_ERR || stat > MAX_CORR_ERR) {
> > +			dev_dbg(dev, "ECC step %d: uncorrectable\n",
> > step);
> > +			mtd->ecc_stats.failed++;
> > +		} else {
> > +			dev_dbg(dev, "ECC step %d: %d bits
> > corrected\n",
> > +				step, stat);
> > +			max_bf = max_t(unsigned int, max_bf, stat);
> > +			mtd->ecc_stats.corrected += stat;
> > +		}
> > +	}
> > +
> > +	return max_bf;
> > +}  
> 
> In spinand_mtd_read() function, rely on the return value -EBADMSG to
> check whether ecc failed. Therefore, maybe there also need return this
> value in mxic_ecc_count_biterrs() function when uncorrectable ecc
> error?

True, I'll fix this.

Thanks,
Miquèl
```