diff options
| author | Michael Welling <mwelling@ieee.org> | 2015-05-24 05:13:43 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-05-25 15:00:04 +0300 |
| commit | 4373f8b6dab0de16e5ecf527626d958d20a45b3b (patch) | |
| tree | 8cd6e6955a7ebb50ac2c5075da8a73f5a3fc291d /drivers/spi | |
| parent | be632f658462f5c80817a383c6d9b9790c0e7d1f (diff) | |
| download | linux-4373f8b6dab0de16e5ecf527626d958d20a45b3b.tar.xz | |
spi: omap2-mcspi: Fix set_cs function for active high
The core spi driver swaps the polarity of the enable based on SPI_CS_HIGH.
The omap2 controller has an internal configuration register bit called
OMAP2_MCSPI_CHCONF_EPOL to handle active high chip selects as well.
So we have to revert swap the polarity back for the correct setting of the
OMAP2_MCSPI_CHCONF_FORCE bit in omap2_mcspi_set_cs.
Signed-off-by: Michael Welling <mwelling@ieee.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-omap2-mcspi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 304b427db95d..502db29fd0fe 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -247,6 +247,13 @@ static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable) { u32 l; + /* The controller handles the inverted chip selects + * using the OMAP2_MCSPI_CHCONF_EPOL bit so revert + * the inversion from the core spi_set_cs function. + */ + if (spi->mode & SPI_CS_HIGH) + enable = !enable; + if (spi->controller_state) { l = mcspi_cached_chconf0(spi); |