[2/9] serial: stm32: fix multi-ports management

Message ID 1499958494-19354-3-git-send-email-bich.hemon@st.com
State New
Headers show
Series
  • Untitled series #2837
Related show

Commit Message

Bich HEMON July 13, 2017, 3:08 p.m.
From: Gerald Baeza <gerald.baeza@st.com>


Correct management of multi-ports. Each port has
its own last residue value and its own alias.

Signed-off-by: Gerald Baeza <gerald.baeza@st.com>

Signed-off-by: Bich Hemon <bich.hemon@st.com>

---
 drivers/tty/serial/stm32-usart.c | 12 +++++++-----
 drivers/tty/serial/stm32-usart.h |  1 +
 2 files changed, 8 insertions(+), 5 deletions(-)

-- 
1.9.1
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Patch

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index ebc49e4..a12d79c 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -111,14 +111,13 @@  static void stm32_receive_chars(struct uart_port *port, bool threaded)
 	unsigned long c;
 	u32 sr;
 	char flag;
-	static int last_res = RX_BUF_L;
 
 	if (port->irq_wake)
 		pm_wakeup_event(tport->tty->dev, 0);
 
-	while (stm32_pending_rx(port, &sr, &last_res, threaded)) {
+	while (stm32_pending_rx(port, &sr, &stm32_port->last_res, threaded)) {
 		sr |= USART_SR_DUMMY_RX;
-		c = stm32_get_char(port, &sr, &last_res);
+		c = stm32_get_char(port, &sr, &stm32_port->last_res);
 		flag = TTY_NORMAL;
 		port->icount.rx++;
 
@@ -694,8 +693,10 @@  static struct stm32_port *stm32_of_get_stm32_port(struct platform_device *pdev)
 		return NULL;
 
 	id = of_alias_get_id(np, "serial");
-	if (id < 0)
-		id = 0;
+	if (id < 0) {
+		dev_err(&pdev->dev, "failed to get alias id, errno %d\n", id);
+		return NULL;
+	}
 
 	if (WARN_ON(id >= STM32_MAX_PORTS))
 		return NULL;
@@ -703,6 +704,7 @@  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].last_res = RX_BUF_L;
 	return &stm32_ports[id];
 }
 
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 0532b2f..65b4ffa 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -222,6 +222,7 @@  struct stm32_port {
 	struct dma_chan *tx_ch;  /* dma tx channel            */
 	dma_addr_t tx_dma_buf;   /* dma tx buffer bus address */
 	unsigned char *tx_buf;   /* dma tx buffer cpu address */
+	int last_res;
 	bool tx_dma_busy;	 /* dma tx busy               */
 	bool hw_flow_control;
 };