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author | Olga Kitaina <okitain@gmail.com> | 2022-06-28 18:48:24 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-21 16:16:16 +0300 |
commit | 04c9d23ac352fb006fc013fca1b9690fe817108e (patch) | |
tree | e86b5d7cc438a0304ced1f0fac75c07a316da26a /drivers | |
parent | dc0e4a10b49d0d9569cc5fb5a4edf53e795994ba (diff) | |
download | linux-04c9d23ac352fb006fc013fca1b9690fe817108e.tar.xz |
mtd: rawnand: arasan: Fix clock rate in NV-DDR
[ Upstream commit e16eceea863b417fd328588b1be1a79de0bc937f ]
According to the Arasan NAND controller spec, the flash clock rate for SDR
must be <= 100 MHz, while for NV-DDR it must be the same as the rate of the
CLK line for the mode. The driver previously always set 100 MHz for NV-DDR,
which would result in incorrect behavior for NV-DDR modes 0-4.
The appropriate clock rate can be calculated from the NV-DDR timing
parameters as 1/tCK, or for rates measured in picoseconds,
10^12 / nand_nvddr_timings->tCK_min.
Fixes: 197b88fecc50 ("mtd: rawnand: arasan: Add new Arasan NAND controller")
CC: stable@vger.kernel.org # 5.8+
Signed-off-by: Olga Kitaina <okitain@gmail.com>
Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220628154824.12222-3-amit.kumar-mahapatra@xilinx.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/mtd/nand/raw/arasan-nand-controller.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/mtd/nand/raw/arasan-nand-controller.c b/drivers/mtd/nand/raw/arasan-nand-controller.c index f926d658192b..50643c6f33f4 100644 --- a/drivers/mtd/nand/raw/arasan-nand-controller.c +++ b/drivers/mtd/nand/raw/arasan-nand-controller.c @@ -907,7 +907,13 @@ static int anfc_setup_interface(struct nand_chip *chip, int target, anand->timings = DIFACE_NVDDR | DIFACE_DDR_MODE(conf->timings.mode); - anand->clk = ANFC_XLNX_SDR_DFLT_CORE_CLK; + if (nand_interface_is_sdr(conf)) { + anand->clk = ANFC_XLNX_SDR_DFLT_CORE_CLK; + } else { + /* ONFI timings are defined in picoseconds */ + anand->clk = div_u64((u64)NSEC_PER_SEC * 1000, + conf->timings.nvddr.tCK_min); + } /* * Due to a hardware bug in the ZynqMP SoC, SDR timing modes 0-1 work |