From: Ivan T. Ivanov <iivanov@mm-sol.com>
Date: Fri, 13 Mar 2015 16:43:49 +0000 (+0200)
Subject: spi: Ensure that CS line is in non-active state after spi_setup()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=1a7b7ee72c218ce9bff274ade13b96ea03eed03d;p=deliverable%2Flinux.git

spi: Ensure that CS line is in non-active state after spi_setup()

Some devices samples state of the chip select signal during power up
and act differently based on this state, so SPI core should ensure
that CS line is driven in non-active state after spi_setup().

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index c64a3e59fce3..4023cc98d808 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1893,6 +1893,8 @@ int spi_setup(struct spi_device *spi)
 	if (!spi->max_speed_hz)
 		spi->max_speed_hz = spi->master->max_speed_hz;
 
+	spi_set_cs(spi, false);
+
 	if (spi->master->setup)
 		status = spi->master->setup(spi);