serial: timbuart: make sure last byte is sent when port is closed

Fix a problem in early versions of the FPGA IP.

In certain situations the IP reports that the FIFO is empty, but a byte is
still clocked out.  If a flush is done at that point the currently clocked
byte is canceled.

This causes incompatibilities with the upper layers when a port is closed,
it waits until the FIFO is empty and then closes the port.  During close
the FIFO is flushed -> the last byte is not sent properly.

Now the FIFO is only flushed if it is reported to be non-empty.  Which
makes the currently clocked out byte to finish.

[akpm@linux-foundation.org: fix build]
Signed-off-by: Richard Röjfors <richard.rojfors@pelagicore.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 10 deletions

diff --git a/drivers/serial/timbuart.c b/drivers/serial/timbuart.c
index 62f389fdc2a3..67ca642713b8 100644
--- a/drivers/serial/timbuart.c
+++ b/drivers/serial/timbuart.c
@@ -68,12 +68,22 @@ static void timbuart_start_tx(struct uart_port *port)
         tasklet_schedule(&uart->tasklet);
 }
 
+static unsigned int timbuart_tx_empty(struct uart_port *port)
+{
+        u32 isr = ioread32(port->membase + TIMBUART_ISR);
+
+        return (isr & TXBE) ? TIOCSER_TEMT : 0;
+}
+
 static void timbuart_flush_buffer(struct uart_port *port)
 {
-        u8 ctl = ioread8(port->membase + TIMBUART_CTRL) | TIMBUART_CTRL_FLSHTX;
+        if (!timbuart_tx_empty(port)) {
+                u8 ctl = ioread8(port->membase + TIMBUART_CTRL) |
+                        TIMBUART_CTRL_FLSHTX;
 
-        iowrite8(ctl, port->membase + TIMBUART_CTRL);
-        iowrite32(TXBF, port->membase + TIMBUART_ISR);
+                iowrite8(ctl, port->membase + TIMBUART_CTRL);
+                iowrite32(TXBF, port->membase + TIMBUART_ISR);
+        }
 }
 
 static void timbuart_rx_chars(struct uart_port *port)
@@ -195,13 +205,6 @@ void timbuart_tasklet(unsigned long arg)
         dev_dbg(uart->port.dev, "%s leaving\n", __func__);
 }
 
-static unsigned int timbuart_tx_empty(struct uart_port *port)
-{
-        u32 isr = ioread32(port->membase + TIMBUART_ISR);
-
-        return (isr & TXBE) ? TIOCSER_TEMT : 0;
-}
-
 static unsigned int timbuart_get_mctrl(struct uart_port *port)
 {
         u8 cts = ioread8(port->membase + TIMBUART_CTRL);