From: Sonic Zhang <sonic.zhang@xxxxxxxxxx>
Blackfin uart supports automatic CTS trigger when hardware flow control is enabled.
No need to start and top tx in CTS interrupt. So, remote ASYNC_CTS_FLOW flag.
Signed-off-by: Sonic Zhang <sonic.zhang@xxxxxxxxxx>
---
drivers/tty/serial/bfin_uart.c | 17 ++++++++++++++---
1 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index dedd9ab..26953bf 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -116,11 +116,20 @@ static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
{
struct bfin_serial_port *uart = dev_id;
- unsigned int status;
-
- status = bfin_serial_get_mctrl(&uart->port);
+ unsigned int status = bfin_serial_get_mctrl(&uart->port);
#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ struct tty_struct *tty = uart->port.state->port.tty;
+
UART_CLEAR_SCTS(uart);
+ if (tty->hw_stopped) {
+ if (status) {
+ tty->hw_stopped = 0;
+ uart_write_wakeup(&uart->port);
+ }
+ } else {
+ if (!status)
+ tty->hw_stopped = 1;
+ }
#endif
uart_handle_cts_change(&uart->port, status & TIOCM_CTS);
@@ -1358,7 +1367,9 @@ static int bfin_serial_probe(struct platform_device *pdev)
uart->cts_pin = -1;
else {
uart->cts_pin = res->start;
+#ifdef CONFIG_SERIAL_BFIN_CTSRTS
uart->port.flags |= ASYNC_CTS_FLOW;
+#endif
}
res = platform_get_resource(pdev, IORESOURCE_IO, 1);
--
1.7.0.4
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