mtd: nand: fix NAND_BUSWIDTH_AUTO for x16 devices

Submitted by Brian Norris on July 18, 2013, 8:17 a.m.

Details

Message ID 1374135422-8975-1-git-send-email-computersforpeace@gmail.com
State Accepted
Commit 68e8078072e802e77134664f11d2ffbfbd2f8fbe
Headers show

Commit Message

Brian Norris July 18, 2013, 8:17 a.m.
The code for NAND_BUSWIDTH_AUTO is broken. According to Alexander:

  "I have a problem with attach NAND UBI in 16 bit mode.
   NAND works fine if I specify NAND_BUSWIDTH_16 option, but not
   working with NAND_BUSWIDTH_AUTO option. In second case NAND
   chip is identifyed with ONFI."

See his report for the rest of the details:

  http://lists.infradead.org/pipermail/linux-mtd/2013-July/047515.html

Anyway, the problem is that nand_set_defaults() is called twice, we
intend it to reset the chip functions to their x16 buswidth verions
if the buswidth changed from x8 to x16; however, nand_set_defaults()
does exactly nothing if called a second time.

Fix this by hacking nand_set_defaults() to reset the buswidth-dependent
functions if they were set to the x8 version the first time. Note that
this does not do anything to reset from x16 to x8, but that's not the
supported use case for NAND_BUSWIDTH_AUTO anyway.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reported-by: Alexander Shiyan <shc_work@mail.ru>
Tested-by: Alexander Shiyan <shc_work@mail.ru>
Cc: Matthieu Castet <matthieu.castet@parrot.com>
Cc: <stable@vger.kernel.org> # v3.8+
---
I have compile-tested only.

David, since this is a bugfix (and likely stable material), any chance we can
get this in 3.11? ;)

 drivers/mtd/nand/nand_base.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Comments

Artem Bityutskiy Aug. 2, 2013, 4:05 p.m.
On Thu, 2013-07-18 at 01:17 -0700, Brian Norris wrote:
> The code for NAND_BUSWIDTH_AUTO is broken. According to Alexander:
> 
>   "I have a problem with attach NAND UBI in 16 bit mode.
>    NAND works fine if I specify NAND_BUSWIDTH_16 option, but not
>    working with NAND_BUSWIDTH_AUTO option. In second case NAND
>    chip is identifyed with ONFI."

Pushed to l2-mtd.git, thanks!

Patch hide | download patch | download mbox

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index acd2fc9..4e4f090 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2786,7 +2786,9 @@  static void nand_set_defaults(struct nand_chip *chip, int busw)
 
 	if (!chip->select_chip)
 		chip->select_chip = nand_select_chip;
-	if (!chip->read_byte)
+
+	/* If called twice, pointers that depend on busw may need to be reset */
+	if (!chip->read_byte || chip->read_byte == nand_read_byte)
 		chip->read_byte = busw ? nand_read_byte16 : nand_read_byte;
 	if (!chip->read_word)
 		chip->read_word = nand_read_word;
@@ -2794,9 +2796,9 @@  static void nand_set_defaults(struct nand_chip *chip, int busw)
 		chip->block_bad = nand_block_bad;
 	if (!chip->block_markbad)
 		chip->block_markbad = nand_default_block_markbad;
-	if (!chip->write_buf)
+	if (!chip->write_buf || chip->write_buf == nand_write_buf)
 		chip->write_buf = busw ? nand_write_buf16 : nand_write_buf;
-	if (!chip->read_buf)
+	if (!chip->read_buf || chip->read_buf == nand_read_buf)
 		chip->read_buf = busw ? nand_read_buf16 : nand_read_buf;
 	if (!chip->scan_bbt)
 		chip->scan_bbt = nand_default_bbt;