From: Jarkko Nikula Date: Thu, 22 Oct 2015 13:44:42 +0000 (+0300) Subject: spi: pxa2xx: Save other reg_cs_ctrl bits when configuring chip select X-Git-Tag: firefly_0821_release~176^2~790^2~1^6~6 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0e8972187971ac6c29a9e5899fa6c555c739237c;p=firefly-linux-kernel-4.4.55.git spi: pxa2xx: Save other reg_cs_ctrl bits when configuring chip select 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 Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index db9016bbd904..4dc5660d4e33 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -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 */