From 1c9f1750f0305bf605ff22686fc0ac89c06deb28 Mon Sep 17 00:00:00 2001
From: Masahisa Kojima <masahisa.kojima@linaro.org>
Date: Mon, 1 Feb 2021 01:31:09 -0600
Subject: [PATCH] spi: spi-synquacer: fix set_cs handling
Git-commit: 1c9f1750f0305bf605ff22686fc0ac89c06deb28
Patch-mainline: v5.12-rc1
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 8cdca6ab8098..ea706d9629cb 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);
}
--
2.26.2