linux-kernel - [PATCH 5.3 096/105] spi: Fix SPI_CS_HIGH setting when using native and GPIO CS

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Message-Id: <20191211150302.227105872@linuxfoundation.org>
Date:   Wed, 11 Dec 2019 16:06:25 +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,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.3 096/105] spi: Fix SPI_CS_HIGH setting when using native and GPIO CS

From: Gregory CLEMENT <gregory.clement@...tlin.com>

commit 3e5ec1db8bfee845d9f8560d1c64aeaccd586398 upstream.

When improving the CS GPIO support at core level, the SPI_CS_HIGH
has been enabled for all the CS lines used for a given SPI controller.

However, the SPI framework allows to have on the same controller native
CS and GPIO CS. The native CS may not support the SPI_CS_HIGH, so they
should not be setup automatically.

With this patch the setting is done only for the CS that will use a
GPIO as CS

Fixes: f3186dd87669 ("spi: Optionally use GPIO descriptors for CS GPIOs")
Cc: <stable@...r.kernel.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
Link: https://lore.kernel.org/r/20191018152929.3287-1-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1710,15 +1710,7 @@ static int of_spi_parse_dt(struct spi_co
 		spi->mode |= SPI_3WIRE;
 	if (of_property_read_bool(nc, "spi-lsb-first"))
 		spi->mode |= SPI_LSB_FIRST;
-
-	/*
-	 * For descriptors associated with the device, polarity inversion is
-	 * handled in the gpiolib, so all chip selects are "active high" in
-	 * the logical sense, the gpiolib will invert the line if need be.
-	 */
-	if (ctlr->use_gpio_descriptors)
-		spi->mode |= SPI_CS_HIGH;
-	else if (of_property_read_bool(nc, "spi-cs-high"))
+	if (of_property_read_bool(nc, "spi-cs-high"))
 		spi->mode |= SPI_CS_HIGH;
 
 	/* Device DUAL/QUAD mode */
@@ -1782,6 +1774,14 @@ static int of_spi_parse_dt(struct spi_co
 	}
 	spi->chip_select = value;
 
+	/*
+	 * For descriptors associated with the device, polarity inversion is
+	 * handled in the gpiolib, so all gpio chip selects are "active high"
+	 * in the logical sense, the gpiolib will invert the line if need be.
+	 */
+	if ((ctlr->use_gpio_descriptors) && ctlr->cs_gpiods[spi->chip_select])
+		spi->mode |= SPI_CS_HIGH;
+
 	/* Device speed */
 	rc = of_property_read_u32(nc, "spi-max-frequency", &value);
 	if (rc) {