diff options
Diffstat (limited to 'drivers/tty/serial/fsl_lpuart.c')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 263cfaabe9e..8978dc9a58b 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -342,8 +342,10 @@ static void lpuart_break_ctl(struct uart_port *port, int break_state) static void lpuart_setup_watermark(struct lpuart_port *sport) { unsigned char val, cr2; + unsigned char cr2_saved; cr2 = readb(sport->port.membase + UARTCR2); + cr2_saved = cr2; cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE | UARTCR2_RIE | UARTCR2_RE); writeb(cr2, sport->port.membase + UARTCR2); @@ -366,6 +368,9 @@ static void lpuart_setup_watermark(struct lpuart_port *sport) writeb(2, sport->port.membase + UARTTWFIFO); writeb(1, sport->port.membase + UARTRWFIFO); + + /* Restore cr2 */ + writeb(cr2_saved, sport->port.membase + UARTCR2); } static int lpuart_startup(struct uart_port *port) @@ -858,7 +863,7 @@ static int __init lpuart_serial_init(void) if (ret) uart_unregister_driver(&lpuart_reg); - return 0; + return ret; } static void __exit lpuart_serial_exit(void) |