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tty/serial: omap: empty the RX FIFO at the end of half-duplex TX

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Provided that the SER_RS485_RX_DURING_TX flag is not set, empty the
RX FIFO to prevent reading back the transmitted data.

Signed-off-by: Dimitris Lampridis <dlampridis@logikonlabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dimitris Lampridis 2014-03-13 15:11:47 +02:00 committed by Greg Kroah-Hartman
parent cab53dc9e2
commit 3a13884abe
1 changed files with 6 additions and 0 deletions
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6
drivers/tty/serial/omap-serial.c
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@ -342,6 +342,12 @@ static void serial_omap_stop_tx(struct uart_port *port)
if ((up->rs485.flags & SER_RS485_ENABLED) &&
!(up->rs485.flags & SER_RS485_RX_DURING_TX)) {
/*
* Empty the RX FIFO, we are not interested in anything
* received during the half-duplex transmission.
*/
serial_out(up, UART_FCR, up->fcr | UART_FCR_CLEAR_RCVR);
/* Re-enable RX interrupts */
up->ier |= UART_IER_RLSI | UART_IER_RDI;
up->port.read_status_mask |= UART_LSR_DR;
serial_out(up, UART_IER, up->ier);