From 8c3bd6b596300d0ade265329f44832e89ef54a22 Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Tue, 21 Jan 2014 07:29:47 +0100 Subject: [PATCH] serial: uartlite: Reset RX/TX in init Just to be sure that there is no pending data. Signed-off-by: Michal Simek --- drivers/serial/serial_xuartlite.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/serial/serial_xuartlite.c b/drivers/serial/serial_xuartlite.c index e613994..988438e 100644 --- a/drivers/serial/serial_xuartlite.c +++ b/drivers/serial/serial_xuartlite.c @@ -18,10 +18,14 @@ #define SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */ #define SR_RX_FIFO_FULL 0x02 /* receive FIFO full */ +#define ULITE_CONTROL_RST_TX 0x01 +#define ULITE_CONTROL_RST_RX 0x02 + struct uartlite { unsigned int rx_fifo; unsigned int tx_fifo; unsigned int status; + unsigned int control; }; static struct uartlite *userial_ports[4] = { @@ -75,8 +79,16 @@ static int uartlite_serial_tstc(const int port) static int uartlite_serial_init(const int port) { - if (userial_ports[port]) + struct uartlite *regs = userial_ports[port]; + + if (regs) { + out_be32(®s->control, 0); + out_be32(®s->control, + ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); + in_be32(®s->control); return 0; + } + return -1; } -- 2.7.4