diff options
| author | Lothar Waßmann <LW@KARO-electronics.de> | 2017-08-29 13:17:12 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-08-29 19:22:33 +0300 |
| commit | 69fc01296c92814b62dbfba1600fe7ed2ed304f5 (patch) | |
| tree | 0f396b85095b1330c1ee47824ab890ba337c69f4 /drivers/mtd | |
| parent | a75d6a4cebcc58c4fb139385fc996a62b6f18f68 (diff) | |
| download | linux-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')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 7 |
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); + } } /* |