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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: 3afbd89c96 ("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>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Christophe JAILLET 2017-05-12 16:35:45 +02:00 committed by syphyr
parent f30cc4da00
commit 60de168ef7
1 changed files with 8 additions and 3 deletions
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11
drivers/tty/serial/efm32-uart.c
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@ -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
@ -578,12 +579,16 @@ 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;