serial: 8250_dw: Set port capabilities based on CPR register

The Designware UART has an optional support for 16750
compatible Auto Flow Control. This will enable it based on
the AFCE bit in Component Parameter Register.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 09aaea2d3a6c..b7c7d6a6cad7 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -221,7 +221,11 @@ static void dw8250_setup_port(struct uart_8250_port *up)
                 p->flags |= UPF_FIXED_TYPE;
                 p->fifosize = DW_UART_CPR_FIFO_SIZE(reg);
                 up->tx_loadsz = p->fifosize;
+                up->capabilities = UART_CAP_FIFO;
         }
+
+        if (reg & DW_UART_CPR_AFCE_MODE)
+                up->capabilities |= UART_CAP_AFE;
 }
 
 static int dw8250_probe(struct platform_device *pdev)