[PATCH 04/20] serial: stm32: make fifoen as property for each port

[Bich HEMON]

From: Bich Hemon <bich.hemon at st.com>

Signed-off-by: Gerald Baeza <gerald.baeza at st.com>
---
 drivers/tty/serial/stm32-usart.c | 10 +++++++---
 drivers/tty/serial/stm32-usart.h |  1 +
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index c6ae4fd..34e31d1 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -453,7 +453,8 @@ static int stm32_startup(struct uart_port *port)
 		return ret;
 
 	val = USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
-	val |= USART_CR1_FIFOEN;
+	if (stm32_port->fifoen)
+		val |= USART_CR1_FIFOEN;
 	stm32_set_bits(port, ofs->cr1, val);
 
 	return 0;
@@ -468,7 +469,8 @@ static void stm32_shutdown(struct uart_port *port)
 
 	val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
 	val |= BIT(cfg->uart_enable_bit);
-	val |= USART_CR1_FIFOEN;
+	if (stm32_port->fifoen)
+		val |= USART_CR1_FIFOEN;
 	stm32_clr_bits(port, ofs->cr1, val);
 
 	free_irq(port->irq, port);
@@ -498,7 +500,8 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
 
 	cr1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
 	cr1 |= BIT(cfg->uart_enable_bit);
-	cr1 |= USART_CR1_FIFOEN;
+	if (stm32_port->fifoen)
+		cr1 |= USART_CR1_FIFOEN;
 	cr2 = 0;
 	cr3 = 0;
 
@@ -707,6 +710,7 @@ static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
 	stm32_ports[id].hw_flow_control = of_property_read_bool(np,
 							"st,hw-flow-ctrl");
 	stm32_ports[id].port.line = id;
+	stm32_ports[id].fifoen = true;
 	return &stm32_ports[id];
 }
 
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 33f1320..9429baf 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -224,6 +224,7 @@ struct stm32_port {
 	unsigned char *tx_buf;   /* dma tx buffer cpu address */
 	bool tx_dma_busy;	 /* dma tx busy               */
 	bool hw_flow_control;
+	bool fifoen;
 };
 
 static struct stm32_port stm32_ports[STM32_MAX_PORTS];
-- 
1.9.1