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UPSTREAM: spi: Make GPIO CSs honour the SPI_NO_CS flag

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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.

Change-Id: I75e69b1eb5068357d9abfe8236cfbd2188c626f1
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
(cherry picked from commit 25972d0c33)
This commit is contained in:
Phil Elwell
2018-10-12 10:23:18 +01:00
committed by Tao Huang
parent 93f999e60a
commit 4c5472af2c
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/spi.c
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@@ -775,7 +775,9 @@ static void spi_set_cs(struct spi_device *spi, bool enable)
enable = !enable;
if (gpio_is_valid(spi->cs_gpio)) {
gpio_set_value(spi->cs_gpio, !enable);
/* Honour the SPI_NO_CS flag */
if (!(spi->mode & SPI_NO_CS))
gpio_set_value(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)