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authorLothar Waßmann <LW@KARO-electronics.de>2017-08-29 13:17:12 +0300
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-08-29 19:22:33 +0300
commit69fc01296c92814b62dbfba1600fe7ed2ed304f5 (patch)
tree0f396b85095b1330c1ee47824ab890ba337c69f4 /drivers/mtd/nand
parenta75d6a4cebcc58c4fb139385fc996a62b6f18f68 (diff)
downloadlinux-69fc01296c92814b62dbfba1600fe7ed2ed304f5.tar.xz
mtd: nand: make Samsung SLC NAND usable again
commit c51d0ac59f24 ("mtd: nand: Move Samsung specific init/detection logic in nand_samsung.c") introduced a regression for Samsung SLC NAND chips. Prior to this commit chip->bits_per_cell was initialized by calling nand_get_bits_per_cell() before using nand_is_slc(). With the offending commit this call is skipped, leaving chip->bits_per_cell cleared to zero when the manufacturer specific '.detect' function calls nand_is_slc() which in turn interprets bits_per_cell != 1 as indication for an MLC chip. The effect is that e.g. a K9F1G08U0F NAND chip is falsely detected as MLC NAND with 4KiB page size rather than SLC with 2KiB page size. Add a call to nand_get_bits_per_cell() before calling the .detect hook function in nand_manufacturer_detect(), so that the nand_is_slc() calls in the manufacturer specific code will return correct results. Fixes: c51d0ac59f24 ("mtd: nand: Move Samsung specific init/detection logic in nand_samsung.c") Cc: <stable@vger.kernel.org> Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd/nand')
-rw-r--r--drivers/mtd/nand/nand_base.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 8f4a681fd10e..6ed5392f3798 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -3813,10 +3813,13 @@ static void nand_manufacturer_detect(struct nand_chip *chip)
* nand_decode_ext_id() otherwise.
*/
if (chip->manufacturer.desc && chip->manufacturer.desc->ops &&
- chip->manufacturer.desc->ops->detect)
+ chip->manufacturer.desc->ops->detect) {
+ /* The 3rd id byte holds MLC / multichip data */
+ chip->bits_per_cell = nand_get_bits_per_cell(chip->id.data[2]);
chip->manufacturer.desc->ops->detect(chip);
- else
+ } else {
nand_decode_ext_id(chip);
+ }
}
/*