mtd: mxc_nand: fix OOB accesses on i.MX27
The OOB handling in the mxc_nand driver is broken for v1 type
controllers (i.MX27/31) with 512 byte page size. This perhaps
did not show up because ubi does not use OOB.
Update the driver to always read/write a whole page even if
only OOB is requested. With this patch the driver passes the
mtd_oobtest on i.MX27 with 512 byte page size. Also tested
with 2048 byte page size and on i.MX35 (v2 type controller)
Signed-off-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 82e9438..6e8aa34 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -623,8 +623,7 @@
else
host->buf_start = column + mtd->writesize;
- if (mtd->writesize > 512)
- command = NAND_CMD_READ0; /* only READ0 is valid */
+ command = NAND_CMD_READ0; /* only READ0 is valid */
send_cmd(host, command, false);
mxc_do_addr_cycle(mtd, column, page_addr);
@@ -639,31 +638,11 @@
break;
case NAND_CMD_SEQIN:
- if (column >= mtd->writesize) {
- /*
- * FIXME: before send SEQIN command for write OOB,
- * We must read one page out.
- * For K9F1GXX has no READ1 command to set current HW
- * pointer to spare area, we must write the whole page
- * including OOB together.
- */
- if (mtd->writesize > 512)
- /* call ourself to read a page */
- mxc_nand_command(mtd, NAND_CMD_READ0, 0,
- page_addr);
+ if (column >= mtd->writesize)
+ /* call ourself to read a page */
+ mxc_nand_command(mtd, NAND_CMD_READ0, 0, page_addr);
- host->buf_start = column;
-
- /* Set program pointer to spare region */
- if (mtd->writesize == 512)
- send_cmd(host, NAND_CMD_READOOB, false);
- } else {
- host->buf_start = column;
-
- /* Set program pointer to page start */
- if (mtd->writesize == 512)
- send_cmd(host, NAND_CMD_READ0, false);
- }
+ host->buf_start = column;
send_cmd(host, command, false);
mxc_do_addr_cycle(mtd, column, page_addr);