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commit 052dc7c45i "spi/dw_spi: conditional transfer mode change" introduced cs_control code, which has a bug by using bit offset for spi mode to set transfer mode in control register. Also it forces devices who don't need cs_control to re-configure the control registers for each spi transfer. This patch will fix them Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>