tree 2b2847ed2d55e90f7febba6250d5adee1a2127ca
parent 224add246deee011b03b5627565cb62ea8a37eb3
author Michael Trimarchi <michael@amarulasolutions.com> 1666332336 +0200
committer Dario Binacchi <dario.binacchi@amarulasolutions.com> 1670679355 +0100

mtd: nand: make Samsung SLC NAND usable again

Upstream linux commit 69fc01296c9281

commit a1286a1fc416 ("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.

Reported-by: Marcin Gołaś <marcingol30@gmail.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Reviewed-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/all/20221021060536.11747-1-michael@amarulasolutions.com
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>