From: Miquel Raynal miquel.raynal@bootlin.com
stable inclusion from stable-5.10.80 commit 5720436bc7ba3370dc8c9baf0b1b28c93bdd9644 bugzilla: 185821 https://gitee.com/openeuler/kernel/issues/I4L7CG
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit b4ebddd6540d78a7f977b3fea0261bd575c6ffe2 upstream.
Following the introduction of the generic ECC engine infrastructure, it was necessary to reorganize the code and move the ECC configuration in the ->attach_chip() hook. Failing to do that properly lead to a first series of fixes supposed to stabilize the situation. Unfortunately, this only fixed the use of software ECC engines, preventing any other kind of engine to be used, including on-die ones.
It is now time to (finally) fix the situation by ensuring that we still provide a default (eg. software ECC) but will still support different ECC engines such as on-die ECC engines if properly described in the device tree.
There are no changes needed on the core side in order to do this, but we just need to leverage the logic there which allows: 1- a subsystem default (set to Host engines in the raw NAND world) 2- a driver specific default (here set to software ECC engines) 3- any type of engine requested by the user (ie. described in the DT)
As the raw NAND subsystem has not yet been fully converted to the ECC engine infrastructure, in order to provide a default ECC engine for this driver we need to set chip->ecc.engine_type *before* calling nand_scan(). During the initialization step, the core will consider this entry as the default engine for this driver. This value may of course be overloaded by the user if the usual DT properties are provided.
Fixes: b36bf0a0fe5d ("mtd: rawnand: socrates: Move the ECC initialization to ->attach_chip()") Cc: stable@vger.kernel.org Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20210928222258.199726-9-miquel.raynal@boot... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Reviewed-by: Weilong Chen chenweilong@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/mtd/nand/raw/socrates_nand.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/nand/raw/socrates_nand.c b/drivers/mtd/nand/raw/socrates_nand.c index 70f8305c9b6e..fb39cc7ebce0 100644 --- a/drivers/mtd/nand/raw/socrates_nand.c +++ b/drivers/mtd/nand/raw/socrates_nand.c @@ -119,9 +119,8 @@ static int socrates_nand_device_ready(struct nand_chip *nand_chip)
static int socrates_attach_chip(struct nand_chip *chip) { - chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; - - if (chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) + if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT && + chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN) chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
return 0; @@ -175,6 +174,13 @@ static int socrates_nand_probe(struct platform_device *ofdev) /* TODO: I have no idea what real delay is. */ nand_chip->legacy.chip_delay = 20; /* 20us command delay time */
+ /* + * This driver assumes that the default ECC engine should be TYPE_SOFT. + * Set ->engine_type before registering the NAND devices in order to + * provide a driver specific default value. + */ + nand_chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; + dev_set_drvdata(&ofdev->dev, host);
res = nand_scan(nand_chip, 1);