[RESEND PATCH V2 1/2] mtd: core: add erase preparation hook function pointer

["Bean Huo (beanhuo)" <beanhuo@xxxxxxxxxx>]

This patch is to add a callback function pointer
for preparation routine of erase in nand_manufacturer_ops.

Signed-off-by: Bean Huo <beanhuo@xxxxxxxxxx>
---
 drivers/mtd/nand/raw/internals.h | 2 ++
 drivers/mtd/nand/raw/nand_base.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h
index fbf6ca0..8382948 100644
--- a/drivers/mtd/nand/raw/internals.h
+++ b/drivers/mtd/nand/raw/internals.h
@@ -42,6 +42,7 @@
  *	     is here to let vendor specific code release those resources.
  * @fixup_onfi_param_page: apply vendor specific fixups to the ONFI parameter
  *			   page. This is called after the checksum is verified.
+ * @erase_pre: preparation before actually erase a physical block.
  */
 struct nand_manufacturer_ops {
 	void (*detect)(struct nand_chip *chip);
@@ -49,6 +50,7 @@ struct nand_manufacturer_ops {
 	void (*cleanup)(struct nand_chip *chip);
 	void (*fixup_onfi_param_page)(struct nand_chip *chip,
 				      struct nand_onfi_params *p);
+	int (*erase_pre)(struct nand_chip *chip, int page);
 };
 
 /**
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index cca4b24..d446d1c 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4246,6 +4246,11 @@ int nand_erase_nand(struct nand_chip *chip, struct erase_info *instr,
 		    (page + pages_per_block))
 			chip->pagebuf = -1;
 
+		if (chip->manufacturer.desc && chip->manufacturer.desc->ops &&
+		    chip->manufacturer.desc->ops->erase_pre)
+			chip->manufacturer.desc->ops->erase_pre(chip,
+						page & chip->pagemask);
+
 		if (chip->legacy.erase)
 			status = chip->legacy.erase(chip,
 						    page & chip->pagemask);
-- 
2.7.4

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