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spi: spi-synquacer: fix set_cs handling

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commit 1c9f1750f0 upstream.

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

Fixes: b0823ee35c ("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>
This commit is contained in:
Masahisa Kojima 2021-02-01 01:31:09 -06:00 committed by Greg Kroah-Hartman
parent 1f8a887593
commit 2e3fb52342
1 changed files with 4 additions and 0 deletions
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4
drivers/spi/spi-synquacer.c
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@ -490,6 +490,10 @@ static void synquacer_spi_set_cs(struct spi_device *spi, bool enable)
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);
}