linux-kernel - [PATCH v1 2/5] mtd: nand: raw: rockchip-nand-controller: add skipbbt option

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Message-ID: <4d9473ce-c167-47d7-e37a-7b39915a724c@gmail.com>
Date:   Thu, 8 Jun 2023 18:30:27 +0200
From:   Johan Jonker <jbx6244@...il.com>
To:     miquel.raynal@...tlin.com
Cc:     richard@....at, vigneshr@...com, heiko@...ech.de,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, yifeng.zhao@...k-chips.com
Subject: [PATCH v1 2/5] mtd: nand: raw: rockchip-nand-controller: add skipbbt
 option

On Rockchip SoCs the first boot stages are written on NAND
with help of manufacturer software that uses a different format
then the MTD framework. Skip the automatic BBT scan with the
NAND_SKIP_BBTSCAN option so we can run it manually.
The NAND_NO_BBM_QUIRK option allows us to erase bad blocks with
the nand_erase_nand() function and the flash_erase command.

Signed-off-by: Johan Jonker <jbx6244@...il.com>
---
 drivers/mtd/nand/raw/rockchip-nand-controller.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mtd/nand/raw/rockchip-nand-controller.c b/drivers/mtd/nand/raw/rockchip-nand-controller.c
index cafccc324..f56430f6c 100644
--- a/drivers/mtd/nand/raw/rockchip-nand-controller.c
+++ b/drivers/mtd/nand/raw/rockchip-nand-controller.c
@@ -188,6 +188,10 @@ struct rk_nfc {
 	unsigned long assigned_cs;
 };

+static int skipbbt;
+module_param(skipbbt, int, 0644);
+MODULE_PARM_DESC(skipbbt, "Skip BBT scan if the NAND chip contains data not in MTD format.");
+
 static inline struct rk_nfc_nand_chip *rk_nfc_to_rknand(struct nand_chip *chip)
 {
 	return container_of(chip, struct rk_nfc_nand_chip, chip);
@@ -1156,6 +1160,10 @@ static int rk_nfc_nand_chip_init(struct device *dev, struct rk_nfc *nfc,

 	nand_set_controller_data(chip, nfc);

+	/* Skip the automatic BBT scan so we can run it manually. */
+	if (skipbbt)
+		chip->options |= NAND_SKIP_BBTSCAN | NAND_NO_BBM_QUIRK;
+
 	chip->options |= NAND_USES_DMA | NAND_NO_SUBPAGE_WRITE;
 	chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;

--
2.30.2