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spi: pxa2xx: Save other reg_cs_ctrl bits when configuring chip select

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Upcoming Intel platforms use LPSS SPI_CS_CONTROL register bits 15:12 for
configuring the chip select polarities. Touch only chip select SW mode and
state bits when enabling the software chip select control in order to not
clear any other bits in the register.

Signed-off-by: Jarkko Nikula <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Jarkko Nikula 2015-10-22 16:44:42 +03:00 • committed by Mark Brown
commit 0e89721879
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/spi-pxa2xx.c
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@ -249,7 +249,9 @@ static void lpss_ssp_setup(struct driver_data *drv_data)
drv_data->lpss_base = drv_data->ioaddr + config->offset;
/* Enable software chip select control */
value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH;
value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl);
value &= ~(SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH);
value |= SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH;
__lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
/* Enable multiblock DMA transfers */