[PATCH] spi: spi-synquacer: fix set_cs handling - Linux-stable-mirror

1 Feb 2021

From: Masahisa Kojima masahisa.kojima@linaro.org
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
---
 drivers/spi/spi-synquacer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c
index 42e82dbe3d41..a3344f1cc8ff 100644
--- a/drivers/spi/spi-synquacer.c
+++ b/drivers/spi/spi-synquacer.c
@@ -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);
 }
-- 
2.20.1


    