Nice catch.
I would like to suggest to send this patch with proper "Fixes:" tag
and do it separately from the patch series.
The reason is that this patch fixes a bug which is not related to
MCTRL_GPIO itself.
2016-03-22 16:12 GMT+03:00 <yegorslists@xxxxxxxxxxxxxx>:
> From: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
>
> When in half-duplex mode RX will be disabled before TX, but not
> enabled after deactivating transmitter. This patch enables
> UART_IER_RLSI and UART_IER_RDI interrupts after TX is over.
>
> Cc: Matwey V. Kornilov <matwey@xxxxxxxxxx>
> Signed-off-by: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
Fixes: e490c9144cfa ("tty: Add software emulated RS485 support for 8250")
> ---
> drivers/tty/serial/8250/8250_port.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
> index e213da0..00ad263 100644
> --- a/drivers/tty/serial/8250/8250_port.c
> +++ b/drivers/tty/serial/8250/8250_port.c
> @@ -1403,9 +1403,18 @@ static void __do_stop_tx_rs485(struct uart_8250_port *p)
> /*
> * Empty the RX FIFO, we are not interested in anything
> * received during the half-duplex transmission.
> + * Enable previously disabled RX interrupts.
> */
> - if (!(p->port.rs485.flags & SER_RS485_RX_DURING_TX))
> + if (!(p->port.rs485.flags & SER_RS485_RX_DURING_TX)) {
> serial8250_clear_fifos(p);
> +
> + serial8250_rpm_get(p);
> +
> + p->ier |= UART_IER_RLSI | UART_IER_RDI;
> + serial_port_out(&p->port, UART_IER, p->ier);
> +
> + serial8250_rpm_put(p);
> + }
> }
>
> static void serial8250_em485_handle_stop_tx(unsigned long arg)
> --
> 2.1.4
>
--
With best regards,
Matwey V. Kornilov.
Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382
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