diff options
| author |   Franklin S Cooper Jr <fcooper@ti.com> | 2015-10-16 10:29:03 -0500 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2015-10-28 09:34:18 +0900 |
| commit | abeedb0159eec42c52a28fc44457164f71aa12a9 (patch) | |
| tree | 0b66cf806bda18184acc6c99d6c1c5c7373d173d /drivers/spi | |
| parent | Linux 4.3-rc1 (diff) | |
| download | linux-dev-abeedb0159eec42c52a28fc44457164f71aa12a9.tar.xz linux-dev-abeedb0159eec42c52a28fc44457164f71aa12a9.zip | |
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 3abb3903f2ad..7b528b0aedb9 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -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, " : "", |