Commit c5abc17d authored Feb 01, 2021 by Masahisa Kojima Committed by Greg Kroah-Hartman Mar 04, 2021

spi: spi-synquacer: fix set_cs handling



commit 1c9f1750f0305bf605ff22686fc0ac89c06deb28 upstream.

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

Fixes: b0823ee3 ("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>

parent 3dbe8f1d

drivers/spi/spi-synquacer.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}