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    Subject[PATCH 5.15 072/779] mtd: rawnand: arasan: Fix clock rate in NV-DDR
    Date
    From: Olga Kitaina <okitain@gmail.com>

    commit e16eceea863b417fd328588b1be1a79de0bc937f upstream.

    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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/mtd/nand/raw/arasan-nand-controller.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    --- a/drivers/mtd/nand/raw/arasan-nand-controller.c
    +++ b/drivers/mtd/nand/raw/arasan-nand-controller.c
    @@ -1043,7 +1043,13 @@ static int anfc_setup_interface(struct n
    DQS_BUFF_SEL_OUT(dqs_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

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