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* [PATCH v3] mtd: rawnand: mxc: Move the ECC engine initialization to the right place
@ 2020-10-16 21:36 Fabio Estevam
  2020-10-18 19:42 ` Fabio Estevam
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Fabio Estevam @ 2020-10-16 21:36 UTC (permalink / raw)
  To: miquel.raynal
  Cc: vigneshr, richard, boris.brezillon, linux-mtd, kernel, han.xu,
	Fabio Estevam

No ECC initialization should happen during the host controller probe.

In fact, we need the probe function to call nand_scan() in order to:

- identify the device, its capabilities and constraints (nand_scan_ident())
- configure the ECC engine accordingly (->attach_chip())
- scan its content and prepare the core (nand_scan_tail())

Moving these lines to mxcnd_attach_chip() fixes a regression caused by
a previous commit supposed to clarify these steps.

When moving the ECC initialization from probe() to attach(), get rid
of the pdata usage to determine the engine type and let the core decide
instead.

Tested on a imx27-pdk board.

Reported-by: Fabio Estevam <festevam@gmail.com>
Co-developed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
Changes since v2:
- Remove pdata check in attach() and let the core determine the engine type

 drivers/mtd/nand/raw/mxc_nand.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/raw/mxc_nand.c b/drivers/mtd/nand/raw/mxc_nand.c
index d4200eb2ad32..684c51e5e60d 100644
--- a/drivers/mtd/nand/raw/mxc_nand.c
+++ b/drivers/mtd/nand/raw/mxc_nand.c
@@ -1681,6 +1681,11 @@ static int mxcnd_attach_chip(struct nand_chip *chip)
 	struct mxc_nand_host *host = nand_get_controller_data(chip);
 	struct device *dev = mtd->dev.parent;
 
+	chip->ecc.bytes = host->devtype_data->eccbytes;
+	host->eccsize = host->devtype_data->eccsize;
+	chip->ecc.size = 512;
+	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
+
 	switch (chip->ecc.engine_type) {
 	case NAND_ECC_ENGINE_TYPE_ON_HOST:
 		chip->ecc.read_page = mxc_nand_read_page;
@@ -1836,19 +1841,7 @@ static int mxcnd_probe(struct platform_device *pdev)
 	if (host->devtype_data->axi_offset)
 		host->regs_axi = host->base + host->devtype_data->axi_offset;
 
-	this->ecc.bytes = host->devtype_data->eccbytes;
-	host->eccsize = host->devtype_data->eccsize;
-
 	this->legacy.select_chip = host->devtype_data->select_chip;
-	this->ecc.size = 512;
-	mtd_set_ooblayout(mtd, host->devtype_data->ooblayout);
-
-	if (host->pdata.hw_ecc) {
-		this->ecc.engine_type = NAND_ECC_ENGINE_TYPE_ON_HOST;
-	} else {
-		this->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
-		this->ecc.algo = NAND_ECC_ALGO_HAMMING;
-	}
 
 	/* NAND bus width determines access functions used by upper layer */
 	if (host->pdata.width == 2)
-- 
2.17.1


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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-16 21:36 [PATCH v3] mtd: rawnand: mxc: Move the ECC engine initialization to the right place Fabio Estevam
2020-10-18 19:42 ` Fabio Estevam
2020-10-19  9:13 ` Sascha Hauer
2020-10-25 18:01   ` Martin Kaiser
2020-10-26 17:45 ` Miquel Raynal
2020-10-26 17:49   ` Miquel Raynal

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