[RFC PATCH 1/3] mtd: rawnand: Add the nand_chip->erase hook

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

In order to solve an issue with Micron NANDs, we must be able to
overload the erase operation. With this in mind, we create a ->erase
hook in the nand_chip structure which points by default to the
currently in use nand_erase_nand() helper.

Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/mtd/nand/raw/nand_base.c | 6 +++++-
 include/linux/mtd/rawnand.h      | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index f64e3b6605c6..1b1d86391e9d 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4153,7 +4153,9 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to,
  */
 static int nand_erase(struct mtd_info *mtd, struct erase_info *instr)
 {
-	return nand_erase_nand(mtd_to_nand(mtd), instr, 0);
+	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	return chip->erase(chip, instr, 0);
 }
 
 /**
@@ -4373,6 +4375,8 @@ static void nand_set_defaults(struct nand_chip *chip)
 
 	if (!chip->buf_align)
 		chip->buf_align = 1;
+
+	chip->erase = nand_erase_nand;
 }
 
 /* Sanitize ONFI strings so we can safely print them */
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 4ab9bccfcde0..aa956949b226 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1020,6 +1020,7 @@ struct nand_legacy {
  *			avoid using them.
  * @setup_read_retry:	[FLASHSPECIFIC] flash (vendor) specific function for
  *			setting the read-retry mode. Mostly needed for MLC NAND.
+ * @erase:		Raw NAND erase operation.
  * @ecc:		[BOARDSPECIFIC] ECC control structure
  * @buf_align:		minimum buffer alignment required by a platform
  * @oob_poi:		"poison value buffer," used for laying out OOB data
@@ -1085,6 +1086,8 @@ struct nand_chip {
 	struct nand_legacy legacy;
 
 	int (*setup_read_retry)(struct nand_chip *chip, int retry_mode);
+	int (*erase)(struct nand_chip *chip, struct erase_info *instr,
+		     int allowbbt);
 
 	unsigned int options;
 	unsigned int bbt_options;
-- 
2.20.1


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