From: Bastian Hecht <hechtb@googlemail.com>
Date: Fri, 27 Apr 2012 10:19:31 +0000 (+0200)
Subject: mtd: nand: Add a NAND_CMD_STATUS when using write verification
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=09cbe581e346229e33c48da00439419ff2fe6af7;p=deliverable%2Flinux.git

mtd: nand: Add a NAND_CMD_STATUS when using write verification

To make sure the NAND chip is properly programmed we need a status
command before each page write. When CONFIG_MTD_NAND_VERIFY_WRITE=y this
assumption is broken when writing multiple pages consecutively. This
patch fixes this.

Signed-off-by: Bastian Hecht <hechtb@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index eb88d8b04262..512066e3d143 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2118,6 +2118,9 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 
 	if (chip->verify_buf(mtd, buf, mtd->writesize))
 		return -EIO;
+
+	/* Make sure the next page prog is preceded by a status read */
+	chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
 #endif
 	return 0;
 }