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    Subject[PATCH 5.11 748/775] spi: spi-synquacer: fix set_cs handling
    Date
    From: Masahisa Kojima <masahisa.kojima@linaro.org>

    commit 1c9f1750f0305bf605ff22686fc0ac89c06deb28 upstream.

    When the slave chip select is deasserted, DMSTOP bit
    must be set.

    Fixes: b0823ee35cf9 ("spi: Add spi driver for Socionext SynQuacer platform")
    Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
    Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
    Cc: stable@vger.kernel.org
    Link: https://lore.kernel.org/r/20210201073109.9036-1-jassisinghbrar@gmail.com
    Signed-off-by: Mark Brown <broonie@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/spi/spi-synquacer.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/drivers/spi/spi-synquacer.c
    +++ b/drivers/spi/spi-synquacer.c
    @@ -490,6 +490,10 @@ static void synquacer_spi_set_cs(struct
    val &= ~(SYNQUACER_HSSPI_DMPSEL_CS_MASK <<
    SYNQUACER_HSSPI_DMPSEL_CS_SHIFT);
    val |= spi->chip_select << SYNQUACER_HSSPI_DMPSEL_CS_SHIFT;
    +
    + if (!enable)
    + val |= SYNQUACER_HSSPI_DMSTOP_STOP;
    +
    writel(val, sspi->regs + SYNQUACER_HSSPI_REG_DMSTART);
    }


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