[RFC PATCH 2/3] mtd: rawnand: Add the nand_chip->write_oob hook

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

With the same approach as for the ->erase hook, in order to solve an
issue with Micron NANDs, we must be able to overload the write
operation. With this in mind, we create a ->write_oob hook in the
nand_chip structure which points by default to the
currently in use nand_write_oob() helper, renamed
nand_write_oob_nand() for the parallel with the nand_erase_nand()
one.

Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/mtd/nand/raw/internals.h | 2 ++
 drivers/mtd/nand/raw/nand_base.c | 8 ++++++++
 include/linux/mtd/rawnand.h      | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h
index cba6fe7dd8c4..55cf26e691ee 100644
--- a/drivers/mtd/nand/raw/internals.h
+++ b/drivers/mtd/nand/raw/internals.h
@@ -80,6 +80,8 @@ int nand_bbm_get_next_page(struct nand_chip *chip, int page);
 int nand_markbad_bbm(struct nand_chip *chip, loff_t ofs);
 int nand_erase_nand(struct nand_chip *chip, struct erase_info *instr,
 		    int allowbbt);
+int nand_write_oob_nand(struct nand_chip *chip, loff_t to,
+			struct mtd_oob_ops *ops);
 int onfi_fill_data_interface(struct nand_chip *chip,
 			     enum nand_data_interface_type type,
 			     int timing_mode);
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 1b1d86391e9d..b0ed556d4d12 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4116,6 +4116,13 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to,
 			  struct mtd_oob_ops *ops)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+
+	return chip->write_oob(chip, to, ops);
+}
+
+int nand_write_oob_nand(struct nand_chip *chip, loff_t to,
+			struct mtd_oob_ops *ops)
+{
 	int ret;
 
 	ops->retlen = 0;
@@ -4377,6 +4384,7 @@ static void nand_set_defaults(struct nand_chip *chip)
 		chip->buf_align = 1;
 
 	chip->erase = nand_erase_nand;
+	chip->write_oob = nand_write_oob_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 aa956949b226..c6ca1e71341d 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1021,6 +1021,7 @@ struct nand_legacy {
  * @setup_read_retry:	[FLASHSPECIFIC] flash (vendor) specific function for
  *			setting the read-retry mode. Mostly needed for MLC NAND.
  * @erase:		Raw NAND erase operation.
+ * @write_oob:		Raw NAND write 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
@@ -1088,6 +1089,8 @@ struct nand_chip {
 	int (*setup_read_retry)(struct nand_chip *chip, int retry_mode);
 	int (*erase)(struct nand_chip *chip, struct erase_info *instr,
 		     int allowbbt);
+	int (*write_oob)(struct nand_chip *chip, loff_t to,
+			 struct mtd_oob_ops *ops);
 
 	unsigned int options;
 	unsigned int bbt_options;
-- 
2.20.1


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