serial: 8250_dw: Allow hardware flow control to be used
In the most common use case, the Synopsys DW UART driver does not set the set_termios callback function. This prevents UPSTAT_AUTOCTS from being set when the UART flag CRTSCTS is set. As a result, the driver will use software flow control as opposed to hardware flow control. To fix the problem, the set_termios callback function is set to the DW specific function. The logic to set UPSTAT_AUTOCTS is moved so that any clock error will not affect setting the hardware flow control. Reviewed-by: Scott Branden <scott.branden@broadcom.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Signed-off-by: Jason Uy <jason.uy@broadcom.com> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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