serial: 8250_dw: proper support for UARTs without busy functionality
If the DW_apb_uart is configured with UART_16550_COMPATIBLE configuration parameter set, then the Busy Functionality is not available. These UARTs will never generate the Busy detect indication interrupt, and therefore don't need handling for it. This creates a small optimization for the DW_apb_uarts configured without the busy functionality, but more importantly, it removes the small but real risk of hitting potential issues caused by busy functionality handling when no busy functionality exist. Signed-off-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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