mtd: mxc_nand: fix 2KiB pagesize NAND on i.MX27

This patch allows i.MX27 to support 2KiB pagesize NAND flash.
We are using a 1.8V NAND flash which datasheet (unfortunately only
available under NDA) says :
Page size: x8: 2,112 bytes (2,048 + 64 bytes).
Without this patch, all sectors are marked as bad eraseblock.

Signed-off-by: Eric Benard <ebenard@eukrea.com>
Acked-by : Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 76beea40d2cf2d35d6f0f5b32f3b45f404a5704b..65b26d5a5c0d391cf72559f6d6f38eadb7b089a1 100644 (file)
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -857,6 +857,17 @@ static void mxc_nand_command(struct mtd_info *mtd, unsigned command,
        }
 }
 
+/* Define some generic bad / good block scan pattern which are used
+ * while scanning a device for factory marked good / bad blocks. */
+static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
+
+static struct nand_bbt_descr smallpage_memorybased = {
+       .options = NAND_BBT_SCAN2NDPAGE,
+       .offs = 5,
+       .len = 1,
+       .pattern = scan_ff_pattern
+};
+
 static int __init mxcnd_probe(struct platform_device *pdev)
 {
        struct nand_chip *this;
@@ -973,7 +984,10 @@ static int __init mxcnd_probe(struct platform_device *pdev)
                goto escan;
        }
 
-       host->pagesize_2k = (mtd->writesize == 2048) ? 1 : 0;
+       if (mtd->writesize == 2048) {
+               host->pagesize_2k = 1;
+               this->badblock_pattern = &smallpage_memorybased;
+       }
 
        if (this->ecc.mode == NAND_ECC_HW) {
                switch (mtd->oobsize) {