Re: [PATCH v2] tty/serial/8250: fix RS485 half-duplex RX
From: Matwey V. Kornilov <hidden>
Date: 2016-03-31 08:10:43
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2016-03-24 11:03 GMT+03:00 [off-list ref]:
From: Yegor Yefremov <redacted>
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 <redacted>
Signed-off-by: Yegor Yefremov <redacted>
Fixes: e490c9144cfa ("tty: Add software emulated RS485 support for 8250")Acked-by: Matwey V. Kornilov <redacted>
quoted hunk ↗ jump to hunk
--- Changes: v2: change subject and add 'Fixes' tag 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