From: Stefan Agner <stefan@agner.ch>
Date: Fri, 8 May 2015 17:07:08 +0000 (+0200)
Subject: mtd: vf610_nfc: allow bitflips in an empty page
X-Git-Tag: v2015.07-rc2~99^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d111bf99a81feacd3876010984a28575964ff0dc;p=platform%2Fkernel%2Fu-boot.git

mtd: vf610_nfc: allow bitflips in an empty page

Allow bit flips in a empty page up to half of the recoverable
bits (strength / 2).

Signed-off-by: Stefan Agner <stefan@agner.ch>
---

diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
index 66b335d..16485f5 100644
--- a/drivers/mtd/nand/vf610_nfc.c
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -527,7 +527,7 @@ static inline int vf610_nfc_correct_data(struct mtd_info *mtd, u_char *dat)
 	flip = count_written_bits(dat, nfc->chip.ecc.size, ecc_count);
 
 	/* ECC failed. */
-	if (flip > ecc_count)
+	if (flip > ecc_count && flip > (nfc->chip.ecc.strength / 2))
 		return -1;
 
 	/* Erased page. */