mtd: mxc_nand: fix OOB corruption when page size > 2KiB

When page size is 4KiB, ecc.total is set to 8*9, and this causes
nand_write_page_hwecc() to read past the initialized part of the eccpos array,
which corrupts chip->oob_poi with bogus values from ecc_calc.

Fix this by creating a proper nand_ecclayout for 4KiB flashes.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 6cd78ed439a7..b7d5a5b9a543 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -211,6 +211,31 @@ static struct nand_ecclayout nandv2_hw_eccoob_largepage = {
         }
 };
 
+/* OOB description for 4096 byte pages with 128 byte OOB */
+static struct nand_ecclayout nandv2_hw_eccoob_4k = {
+        .eccbytes = 8 * 9,
+        .eccpos = {
+                7,  8,  9, 10, 11, 12, 13, 14, 15,
+                23, 24, 25, 26, 27, 28, 29, 30, 31,
+                39, 40, 41, 42, 43, 44, 45, 46, 47,
+                55, 56, 57, 58, 59, 60, 61, 62, 63,
+                71, 72, 73, 74, 75, 76, 77, 78, 79,
+                87, 88, 89, 90, 91, 92, 93, 94, 95,
+                103, 104, 105, 106, 107, 108, 109, 110, 111,
+                119, 120, 121, 122, 123, 124, 125, 126, 127,
+        },
+        .oobfree = {
+                {.offset = 2, .length = 4},
+                {.offset = 16, .length = 7},
+                {.offset = 32, .length = 7},
+                {.offset = 48, .length = 7},
+                {.offset = 64, .length = 7},
+                {.offset = 80, .length = 7},
+                {.offset = 96, .length = 7},
+                {.offset = 112, .length = 7},
+        }
+};
+
 #ifdef CONFIG_MTD_PARTITIONS
 static const char *part_probes[] = { "RedBoot", "cmdlinepart", NULL };
 #endif
@@ -1186,6 +1211,8 @@ static int __init mxcnd_probe(struct platform_device *pdev)
 
         if (mtd->writesize == 2048)
                 this->ecc.layout = oob_largepage;
+        if (nfc_is_v21() && mtd->writesize == 4096)
+                this->ecc.layout = &nandv2_hw_eccoob_4k;
 
         /* second phase scan */
         if (nand_scan_tail(mtd)) {