Re: [PATCH v5 09/12] mtd: rawnand: ingenic: Make use of ecc-engine property

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Hi,

Le ven. 15 mars 2019 à 15:37, Paul Cercueil <paul@xxxxxxxxxxxxxxx> a écrit :
Hi,

Le ven. 15 mars 2019 à 9:40, Miquel Raynal <miquel.raynal@xxxxxxxxxxx> a écrit :
Hi Paul,

Paul Cercueil <paul@xxxxxxxxxxxxxxx> wrote on Wed, 13 Mar 2019 23:22:56
+0100:

 Use the 'ecc-engine' standard property instead of the custom
 'ingenic,bch-controller' custom property, which is now deprecated.

 Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
 ---

 Notes:
     v5: New patch

  drivers/mtd/nand/raw/ingenic/ingenic_ecc.c | 13 ++++++++++---
  1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c b/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
 index d7f3a8c3abea..30436ca6628a 100644
 --- a/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
 +++ b/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
@@ -82,9 +82,9 @@ static struct ingenic_ecc *ingenic_ecc_get(struct device_node *np)

  /**
   * of_ingenic_ecc_get() - get the ECC controller from a DT node
 - * @of_node: the node that contains a bch-controller property.
 + * @of_node: the node that contains a ecc-engine property.

Would "contains an ecc-engine property" be better English?

I am not sure what is the rule when it comes to plain English with
variable names. However if you agree, no need to re-send the series, I
can fix it when applying.

Yes, that's better.

BTW, I added hw ECC engines support to my generic ECC engine
implementation, but migrating the whole raw NAND subsystem (using I/O
requests like in the SPI-NAND core, adding prepare/finish_io_req hooks) is going to be much more invasive than initially expected, so I am not
sure I will finish the migration any time soon.

Ok, I will follow the development then.

Thanks,
Miquèl

One thing I notice with my patchset: it works perfectly on top of 4.20, but on top of 5.0 I am unable to erase any eraseblock with flash_erase.
I get -EIO every time. I'm trying to debug it but didn't go very far,
it looks like nand_status_op() gives me a status of 0xff. Do you know
what could have changed between 4.20 and 5.0 that could trigger this bug?

Nevermind. It works now.

Second thing, everytime I reboot it fails to find the BBT. That's because the BBT marker is overwritten by the ECC data as they occupy the same area in the OOB space. Is there a way to move the BBT marker? Or should I use
NAND_BBT_NO_OOB then? Since the eraseblocks where the BBTs are located
is used in my system partition, won't that conflict with the data?

Response to myself: It's possible to move the BBT marker. But in my case I
have to deal with three possible layouts, so it's simpler to just use
NAND_BBT_NO_OOB then. The BBT pages are marked so that they're not used
for data in the partitions.

I'll send a V6 then.

Thanks,
-Paul


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