Fix cs_change management so that it is in line with other spi drivers. In the spi core api helpers such as spi_bus_lock/unlock and spi_sync_locked or cs_change field in spi_transfer help to manage chip select from the device driver. The driver was setting the chip select to idle if the message queue was empty despite cs_change or other status field set by spi_bus_lock/unlock or spi_sync_locked. Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Mark Brown <broonie@kernel.org>