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path: root/drivers/tty/serial/mpc52xx_uart.c
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Diffstat (limited to 'drivers/tty/serial/mpc52xx_uart.c')
-rw-r--r--drivers/tty/serial/mpc52xx_uart.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c
index 41de374d9..8c3e51314 100644
--- a/drivers/tty/serial/mpc52xx_uart.c
+++ b/drivers/tty/serial/mpc52xx_uart.c
@@ -1135,6 +1135,13 @@ mpc52xx_uart_startup(struct uart_port *port)
psc_ops->command(port, MPC52xx_PSC_RST_RX);
psc_ops->command(port, MPC52xx_PSC_RST_TX);
+ /*
+ * According to Freescale's support the RST_TX command can produce a
+ * spike on the TX pin. So they recommend to delay "for one character".
+ * One millisecond should be enough for everyone.
+ */
+ msleep(1);
+
psc_ops->set_sicr(port, 0); /* UART mode DCD ignored */
psc_ops->fifo_init(port);