serial: efm32: Fix parity management in 'efm32_uart_console_get_options()'

commit be40597a1bc173bf9dadccdf5388b956f620ae8f upstream.

UARTn_FRAME_PARITY_ODD is 0x0300
UARTn_FRAME_PARITY_EVEN is 0x0200
So if the UART is configured for EVEN parity, it would be reported as ODD.
Fix it by correctly testing if the 2 bits are set.

Fixes: 3afbd89c9639 ("serial/efm32: add new driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/efm32-uart.c b/drivers/tty/serial/efm32-uart.c
index 195acc868763b711e8c3334c354cd86a90286a40..5d476916191b74a93c1787f1f26f3d72c278ebe0 100644 (file)
--- a/drivers/tty/serial/efm32-uart.c
+++ b/drivers/tty/serial/efm32-uart.c
@@ -27,6 +27,7 @@
 #define UARTn_FRAME            0x04
 #define UARTn_FRAME_DATABITS__MASK     0x000f
 #define UARTn_FRAME_DATABITS(n)                ((n) - 3)
+#define UARTn_FRAME_PARITY__MASK       0x0300
 #define UARTn_FRAME_PARITY_NONE                0x0000
 #define UARTn_FRAME_PARITY_EVEN                0x0200
 #define UARTn_FRAME_PARITY_ODD         0x0300
@@ -572,12 +573,16 @@ static void efm32_uart_console_get_options(struct efm32_uart_port *efm_port,
                        16 * (4 + (clkdiv >> 6)));
 
        frame = efm32_uart_read32(efm_port, UARTn_FRAME);
-       if (frame & UARTn_FRAME_PARITY_ODD)
+       switch (frame & UARTn_FRAME_PARITY__MASK) {
+       case UARTn_FRAME_PARITY_ODD:
                *parity = 'o';
-       else if (frame & UARTn_FRAME_PARITY_EVEN)
+               break;
+       case UARTn_FRAME_PARITY_EVEN:
                *parity = 'e';
-       else
+               break;
+       default:
                *parity = 'n';
+       }
 
        *bits = (frame & UARTn_FRAME_DATABITS__MASK) -
                        UARTn_FRAME_DATABITS(4) + 4;