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>

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);