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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>
This commit is contained in:
Franklin S Cooper Jr 2015-10-16 10:29:03 -05:00 committed by Mark Brown
parent 6ff33f3902
commit abeedb0159
1 changed files with 2 additions and 2 deletions
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4
drivers/spi/spi.c
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@ -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, " : "",