linux-kernel - [PATCH 5.4 319/340] spi: spi-synquacer: fix set

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Message-Id: <20210301161103.992369522@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:14:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Masahisa Kojima <masahisa.kojima@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.4 319/340] spi: spi-synquacer: fix set_cs handling

From: Masahisa Kojima <masahisa.kojima@...aro.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@...aro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20210201073109.9036-1-jassisinghbrar@gmail.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);
 }