Commit abeedb01 authored Oct 16, 2015 by Franklin S Cooper Jr Committed by Mark Brown Oct 28, 2015

spi: Setup the master controller driver before setting the chipselect



SPI controllers may need to be properly setup before chip selects
can be used. Therefore, wait until the spi controller has a chance
to perform their setup procedure before trying to use the chip
select.

This also insures that the chip selects pins are in a good
state before asseting them which otherwise may cause confusion.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Tested-by: Grygorii Strashko <grygorii.strashko@ti.com>
Tested-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent 6ff33f39

drivers/spi/spi.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1993,11 +1993,11 @@ 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);

		spi_set_cs(spi, false);

		dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s%u bits/w, %u Hz max --> %d\n",
		(int) (spi->mode & (SPI_CPOL \| SPI_CPHA)),
		(spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",