On Tue, Mar 22, 2016 at 8:29 PM, Matwey V. Kornilov <matwey@xxxxxxxxxx> wrote:
> 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.
Done.
Yegor
> 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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