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SubjectRe: Kernel 5.10-rc1 not mounting NAND flash (Bisected to d7157ff49a5b ("mtd: rawnand: Use the ECC framework user input parsing bits"))
Hi Christophe,

Christophe Leroy <christophe.leroy@csgroup.eu> wrote on Wed, 4 Nov 2020
19:37:57 +0100:

> Hi Miquel,
>
> Le 04/11/2020 à 18:38, Miquel Raynal a écrit :
> > Hi Christophe,
> >
> > Christophe Leroy <christophe.leroy@csgroup.eu> wrote on Wed, 04 Nov
> > 2020 18:33:53 +0100:
> >
> >> Hi Miquel,
> >>
> >> I'm unable to boot 5.10-rc1 on my boards. I get the following error:
> >>
> >> [ 4.125811] nand: device found, Manufacturer ID: 0xad, Chip ID: 0x76
> >> [ 4.131992] nand: Hynix NAND 64MiB 3,3V 8-bit
> >> [ 4.136173] nand: 64 MiB, SLC, erase size: 16 KiB, page size: 512, OOB size: 16
> >> [ 4.143534] ------------[ cut here ]------------
> >> [ 4.147934] Unsupported ECC algorithm!
> >> [ 4.152142] WARNING: CPU: 0 PID: 1 at drivers/mtd/nand/raw/nand_base.c:5244 nand_scan_with_ids+0x1260/0x1640
> >> ...
> >> [ 4.332052] ---[ end trace e3a36f62cae4ac56 ]---
> >> [ 4.336882] gpio-nand: probe of c0000000.nand failed with error -22
> >>
> >> Bisected to commit d7157ff49a5b ("mtd: rawnand: Use the ECC framework user input parsing bits")
> >>
> >> My first impression is that with that change, the value set in chip->ecc.algo
> >> by gpio_nand_probe() in drivers/mtd/nand/raw/gpio.c gets overwritten in rawnand_dt_init()
> >>
> >> The following change fixes the problem, though I'm not sure it is the right fix. Can you have a look ?
> >>
> >> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> >> index 1f0d542d5923..aa74797cf2da 100644
> >> --- a/drivers/mtd/nand/raw/nand_base.c
> >> +++ b/drivers/mtd/nand/raw/nand_base.c
> >> @@ -5032,7 +5032,8 @@ static int rawnand_dt_init(struct nand_chip *chip)
> >> chip->ecc.engine_type = nand->ecc.defaults.engine_type;
> >>
> >> chip->ecc.placement = nand->ecc.user_conf.placement;
> >> - chip->ecc.algo = nand->ecc.user_conf.algo;
> >> + if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
> >> + chip->ecc.algo = nand->ecc.user_conf.algo;
> >> chip->ecc.strength = nand->ecc.user_conf.strength;
> >> chip->ecc.size = nand->ecc.user_conf.step_size;
> >>
> >> ---
> >>
> >> Thanks
> >> Christophe
> >
> > Sorry for introducing this issue, I didn't had the time to send the
> > Fixes PR yet but I think this issue has been solved already. Could
> > you please try with a recent linux-next?
> >
>
> Sorry, same problem with "Linux version 5.10.0-rc2-next-20201104"

Can you please give this patch a try, please?

---8<---

Author: Miquel Raynal <miquel.raynal@bootlin.com>
Date: Thu Nov 5 08:44:48 2020 +0100

mtd: rawnand: gpio: Move the ECC initialization to ->attach_chip()

While forcing a Hamming software ECC looks clearly wrong, let's just
fix the situation for now and move these lines to the ->attach_chip()
hook which gets executed after the user input parsing and NAND chip
discovery.

Fixes: d7157ff49a5b ("mtd: rawnand: Use the ECC framework user input parsing bits")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

diff --git a/drivers/mtd/nand/raw/gpio.c b/drivers/mtd/nand/raw/gpio.c
index 3bd847ccc3f3..6feab847f5e0 100644
--- a/drivers/mtd/nand/raw/gpio.c
+++ b/drivers/mtd/nand/raw/gpio.c
@@ -161,8 +161,15 @@ static int gpio_nand_exec_op(struct nand_chip *chip,
return ret;
}

+static int gpio_nand_attach_chip(struct nand_chip *chip)
+{
+ chip->ecc.mode = NAND_ECC_SOFT;
+ chip->ecc.algo = NAND_ECC_HAMMING;
+}
+
static const struct nand_controller_ops gpio_nand_ops = {
.exec_op = gpio_nand_exec_op,
+ .attach_chip = gpio_nand_attach_chip,
};

#ifdef CONFIG_OF
@@ -342,8 +349,6 @@ static int gpio_nand_probe(struct platform_device *pdev)
gpiomtd->base.ops = &gpio_nand_ops;

nand_set_flash_node(chip, pdev->dev.of_node);
- chip->ecc.mode = NAND_ECC_SOFT;
- chip->ecc.algo = NAND_ECC_HAMMING;
chip->options = gpiomtd->plat.options;
chip->controller = &gpiomtd->base;

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