1 files changed, 23 insertions, 21 deletions

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 3b2c25bd2e06..8d0838c904c8 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -306,16 +306,16 @@ static int atmel_config_rs485(struct uart_port *port,
 
 	mode = atmel_uart_readl(port, ATMEL_US_MR);
 
-	/* Resetting serial mode to RS232 (0x0) */
-	mode &= ~ATMEL_US_USMODE;
-
-	port->rs485 = *rs485conf;
-
 	if (rs485conf->flags & SER_RS485_ENABLED) {
 		dev_dbg(port->dev, "Setting UART to RS485\n");
-		atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
+		if (rs485conf->flags & SER_RS485_RX_DURING_TX)
+			atmel_port->tx_done_mask = ATMEL_US_TXRDY;
+		else
+			atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
+
 		atmel_uart_writel(port, ATMEL_US_TTGR,
 				  rs485conf->delay_rts_after_send);
+		mode &= ~ATMEL_US_USMODE;
 		mode |= ATMEL_US_USMODE_RS485;
 	} else {
 		dev_dbg(port->dev, "Setting UART to RS232\n");
@@ -832,7 +832,7 @@ static void atmel_tx_chars(struct uart_port *port)
 	struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
 
 	if (port->x_char &&
-	    (atmel_uart_readl(port, ATMEL_US_CSR) & atmel_port->tx_done_mask)) {
+	    (atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY)) {
 		atmel_uart_write_char(port, port->x_char);
 		port->icount.tx++;
 		port->x_char = 0;
@@ -840,8 +840,7 @@ static void atmel_tx_chars(struct uart_port *port)
 	if (uart_circ_empty(xmit) || uart_tx_stopped(port))
 		return;
 
-	while (atmel_uart_readl(port, ATMEL_US_CSR) &
-	       atmel_port->tx_done_mask) {
+	while (atmel_uart_readl(port, ATMEL_US_CSR) & ATMEL_US_TXRDY) {
 		atmel_uart_write_char(port, xmit->buf[xmit->tail]);
 		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
 		port->icount.tx++;
@@ -852,10 +851,20 @@ static void atmel_tx_chars(struct uart_port *port)
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
 
-	if (!uart_circ_empty(xmit))
+	if (!uart_circ_empty(xmit)) {
+		/* we still have characters to transmit, so we should continue
+		 * transmitting them when TX is ready, regardless of
+		 * mode or duplexity
+		 */
+		atmel_port->tx_done_mask |= ATMEL_US_TXRDY;
+
 		/* Enable interrupts */
 		atmel_uart_writel(port, ATMEL_US_IER,
 				  atmel_port->tx_done_mask);
+	} else {
+		if (atmel_uart_is_half_duplex(port))
+			atmel_port->tx_done_mask &= ~ATMEL_US_TXRDY;
+	}
 }
 
 static void atmel_complete_tx_dma(void *arg)
@@ -875,11 +884,11 @@ static void atmel_complete_tx_dma(void *arg)
 
 	port->icount.tx += atmel_port->tx_len;
 
-	spin_lock_irq(&atmel_port->lock_tx);
+	spin_lock(&atmel_port->lock_tx);
 	async_tx_ack(atmel_port->desc_tx);
 	atmel_port->cookie_tx = -EINVAL;
 	atmel_port->desc_tx = NULL;
-	spin_unlock_irq(&atmel_port->lock_tx);
+	spin_unlock(&atmel_port->lock_tx);
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
 		uart_write_wakeup(port);
@@ -2541,8 +2550,7 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
 	 * Use TXEMPTY for interrupt when rs485 or ISO7816 else TXRDY or
 	 * ENDTX|TXBUFE
 	 */
-	if (port->rs485.flags & SER_RS485_ENABLED ||
-	    port->iso7816.flags & SER_ISO7816_ENABLED)
+	if (atmel_uart_is_half_duplex(port))
 		atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
 	else if (atmel_use_pdc_tx(port)) {
 		port->fifosize = PDC_BUFFER_SIZE;
@@ -2634,13 +2642,7 @@ static void __init atmel_console_get_options(struct uart_port *port, int *baud,
 	else if (mr == ATMEL_US_PAR_ODD)
 		*parity = 'o';
 
-	/*
-	 * The serial core only rounds down when matching this to a
-	 * supported baud rate. Make sure we don't end up slightly
-	 * lower than one of those, as it would make us fall through
-	 * to a much lower baud rate than we really want.
-	 */
-	*baud = port->uartclk / (16 * (quot - 1));
+	*baud = port->uartclk / (16 * quot);
 }
 
 static int __init atmel_console_setup(struct console *co, char *options)