linux-kernel - Re: [PATCH v3 1/2] mtd: spi-nand: Add read retry support

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Message-ID: <878qqj3sju.fsf@bootlin.com>
Date: Thu, 06 Feb 2025 18:13:25 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Cheng Ming Lin <linchengming884@...il.com>
Cc: vigneshr@...com,  linux-mtd@...ts.infradead.org,
  linux-kernel@...r.kernel.org,  richard@....at,  alvinzhou@...c.com.tw,
  leoyu@...c.com.tw,  Cheng Ming Lin <chengminglin@...c.com.tw>
Subject: Re: [PATCH v3 1/2] mtd: spi-nand: Add read retry support

Hello Cheng,

> @@ -687,18 +691,43 @@ static int spinand_mtd_regular_page_read(struct mtd_info *mtd, loff_t from,
>  		if (ret)
>  			break;
>  
> +read_retry:
>  		ret = spinand_read_page(spinand, &iter.req);
>  		if (ret < 0 && ret != -EBADMSG)
>  			break;
>  
> -		if (ret == -EBADMSG)
> +		if (ret == -EBADMSG && spinand->set_read_retry) {
> +			if (spinand->read_retries && (++retry_mode < spinand->read_retries)) {

I believe the condition should be:

                        if (spinand->read_retries && (++retry_mode <= spinand->read_retries)) {

So if you have 5 retry modes, you can provide 5 in the manufacturer driver,
and not 6.

> +				ret = spinand->set_read_retry(spinand, retry_mode);
> +				if (ret < 0) {
> +					ecc_failed = true;
> +					return ret;

Shall we try to set the read_retry level to 0 upon:

      if (ret < 0 && retry_mode > 1)

?

> +				}
> +
> +				/* Reset ecc_stats; retry */
> +				mtd->ecc_stats = old_stats;
> +				goto read_retry;
> +			} else {
> +				/* No more retry modes; real failure */
> +				ecc_failed = true;
> +			}
> +		} else if (ret == -EBADMSG) {

Rest lgtm.

Thanks,
Miquèl