TDA2EXEVM: SPI CS Signal Still Active when Transmit end

Part Number: TDA2EXEVM

Hi all

I am trying to Implement SPI Communication Function on TDA2Ex Platform, 

I Use SPI2 as Master , and Enable CS like this

McSPICSEnable(MCSPI2_BASE_ADDRESS);
McSPIMasterModeEnable(MCSPI2_BASE_ADDRESS);

McSPICSPolarityConfig(MCSPI2_BASE_ADDRESS,
                          (MCSPI_CH0CONF_EPOL_ACTIVELOW <<
                           MCSPI_CH0CONF_EPOL_SHIFT), gChNum);

and before I transmit data, I follow the sample code, enable the Channel

McSPIChannelEnable(MCSPI2_BASE_ADDRESS, gChNum);

and when end of the communication, I disable the Channel

McSPIChannelDisable(MCSPI2_BASE_ADDRESS, gChNum);

I saw the SCLK and DATA were working fine

But  when I measure the CS Signal, I found the CS Signal still on the active status ( low) , although I disable the Channel

So, I want to know how to config SPI2 Controller to make CS Signal on the inactive status (Pull High) when end of transmission