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From 2910d986df71ea75845706084fd257d2b9127e74 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 3 Jul 2018 14:23:47 +0100
Subject: [PATCH 161/725] spi: Make GPIO CSs honour the SPI_NO_CS flag
The SPI configuration state includes an SPI_NO_CS flag that disables
all CS line manipulation, for applications that want to manage their
own chip selects. However, this flag is ignored by the GPIO CS code
in the SPI framework.
Correct this omission with a trivial patch.
See: https://github.com/raspberrypi/linux/issues/2169
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
drivers/spi/spi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -733,7 +733,9 @@ static void spi_set_cs(struct spi_device
enable = !enable;
if (gpio_is_valid(spi->cs_gpio)) {
- gpio_set_value_cansleep(spi->cs_gpio, !enable);
+ /* Honour the SPI_NO_CS flag */
+ if (!(spi->mode & SPI_NO_CS))
+ gpio_set_value_cansleep(spi->cs_gpio, !enable);
/* Some SPI masters need both GPIO CS & slave_select */
if ((spi->controller->flags & SPI_MASTER_GPIO_SS) &&
spi->controller->set_cs)
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