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tty/serial: omap: fix RX interrupt enable/disable in half-duplex TX 

Make sure that serial_omap_stop_rx() also disables RDI (Receiver Data Interrupt),
otherwise the interrupt handler will call serial_omap_rdi() to read the new data,
resulting in the transmission being echoed back.

When the half-duplex transmission is complete, in order to reverse the effects of
serial_omap_stop_rx(), we should re-enable:

  * the RX interrupts _without_ overwriting up->ier

  * the UART_LSR_DR bit of the up->port.read_status_mask

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 15:11:46 +02:00 committed by Greg Kroah-Hartman
parent 9b971cd206
commit cab53dc9e2
1 changed files with 3 additions and 2 deletions
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5
drivers/tty/serial/omap-serial.c
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@ -342,7 +342,8 @@ 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)) {
up->ier = UART_IER_RLSI | UART_IER_RDI;
up->ier |= UART_IER_RLSI | UART_IER_RDI;
up->port.read_status_mask |= UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
}
@ -355,7 +356,7 @@ static void serial_omap_stop_rx(struct uart_port *port)
struct uart_omap_port *up = to_uart_omap_port(port);
pm_runtime_get_sync(up->dev);
up->ier &= ~UART_IER_RLSI;
up->ier &= ~(UART_IER_RLSI | UART_IER_RDI);
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
pm_runtime_mark_last_busy(up->dev);