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spi: omap2-mcspi: Fix set_cs function for active high

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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>
This commit is contained in:
Michael Welling 2015-05-23 21:13:43 -05:00 committed by Mark Brown
parent be632f6584
commit 4373f8b6da
1 changed files with 7 additions and 0 deletions
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7
drivers/spi/spi-omap2-mcspi.c
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@ -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);