commit: http://blackfin.uclinux.org/git/?p=linux-kernel;a=commitdiff;h=de8f67b314312a4bc9e5003ecde6c28a6be607bc branch: http://blackfin.uclinux.org/git/?p=linux-kernel;a=shortlog;h=refs/heads/trunk
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 <[email protected]> --- 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 4869285..48e86c4 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);
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