From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Kamal Dasu <kdasu.kdev@gmail.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>,
Richard Weinberger <richard@nod.at>,
linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com,
Brian Norris <computersforpeace@gmail.com>
Subject: Re: [PATCH 2/2] mtd: rawnand: brcmnand: Ecc error handling on EDU transfers
Date: Thu, 11 Jun 2020 09:27:07 +0200 [thread overview]
Message-ID: <20200611092707.75da8c6a@xps13> (raw)
In-Reply-To: <20200611054454.2547-2-kdasu.kdev@gmail.com>
Hi Kamal,
Kamal Dasu <kdasu.kdev@gmail.com> wrote on Thu, 11 Jun 2020 01:44:54
-0400:
> Implemented ECC correctable and uncorrectable error handling for EDU
Implement?
> reads. If ECC correctable bitflips are encountered on EDU transfer,
extra space ^
> read page again using pio, This is needed due to a controller lmitation
s/pio/PIO/
> where read and corrected data is not transferred to the DMA buffer on ECC
> errors. This holds true for ECC correctable errors beyond set threshold.
error.
Not sure what the last sentence means?
>
> Fixes: a5d53ad26a8b ("mtd: rawnand: brcmnand: Add support for flash-edu for dma transfers")
> Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
> ---
Minor nits below :)
> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 26 ++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 0c1d6e543586..d7daa83c8a58 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -1855,6 +1855,22 @@ static int brcmnand_edu_trans(struct brcmnand_host *host, u64 addr, u32 *buf,
> edu_writel(ctrl, EDU_STOP, 0); /* force stop */
> edu_readl(ctrl, EDU_STOP);
>
> + if (ret == 0 && edu_cmd == EDU_CMD_READ) {
!ret
> + u64 err_addr = 0;
> +
> + /*
> + * check for ecc errors here, subpage ecc erros are
> + * retained in ecc error addr register
s/ecc/ECC/
s/erros/errors/
s/addr/address/
> + */
> + err_addr = brcmnand_get_uncorrecc_addr(ctrl);
> + if (!err_addr) {
> + err_addr = brcmnand_get_correcc_addr(ctrl);
> + if (err_addr)
> + ret = -EUCLEAN;
> + } else
> + ret = -EBADMSG;
I don't like very much to see these values being used within NAND
controller drivers but I see it's already the cause, so I guess I can
live with that.
> + }
> +
> return ret;
> }
>
> @@ -2058,6 +2074,7 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
> u64 err_addr = 0;
> int err;
> bool retry = true;
> + bool edu_read = false;
>
> dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf);
>
> @@ -2075,6 +2092,10 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
> else
> return -EIO;
> }
> +
> + if (has_edu(ctrl))
> + edu_read = true;
You don't need this extra value, you already have the cmd parameter
which tells you if it is a read or a write. You might even want to
create a if block so set dir and edu_cmd and eventually a local
edu_read if you think it still makes sense.
> +
> } else {
> if (oob)
> memset(oob, 0x99, mtd->oobsize);
> @@ -2122,6 +2143,11 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
> if (mtd_is_bitflip(err)) {
> unsigned int corrected = brcmnand_count_corrected(ctrl);
>
> + /* in case of edu correctable error we read again using pio */
s/edu/EDU/ ?
s/pio/PIO/
> + if (edu_read)
> + err = brcmnand_read_by_pio(mtd, chip, addr, trans, buf,
> + oob, &err_addr);
> +
> dev_dbg(ctrl->dev, "corrected error at 0x%llx\n",
> (unsigned long long)err_addr);
> mtd->ecc_stats.corrected += corrected;
Thanks,
Miquèl
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next prev parent reply other threads:[~2020-06-11 7:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 5:44 [PATCH 1/2] mtd: rawnand: brcmnand: Don't default to edu transfer Kamal Dasu
2020-06-11 5:44 ` [PATCH 2/2] mtd: rawnand: brcmnand: Ecc error handling on EDU transfers Kamal Dasu
2020-06-11 7:27 ` Miquel Raynal [this message]
2020-06-11 16:04 ` Kamal Dasu
2020-06-12 7:07 ` Miquel Raynal
2020-06-12 16:34 ` Kamal Dasu
2020-06-15 7:19 ` Miquel Raynal
2020-06-15 15:11 ` Kamal Dasu
2020-06-15 17:37 ` Miquel Raynal
2020-06-11 7:16 ` [PATCH 1/2] mtd: rawnand: brcmnand: Don't default to edu transfer Miquel Raynal
2020-06-11 15:22 ` Kamal Dasu
2020-06-11 15:24 ` Miquel Raynal
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