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

[Bich HEMON]

From: Gerald Baeza 

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

Signed-off-by: Gerald Baeza 
Signed-off-by: Bich Hemon 
---
 drivers/tty/serial/stm32-usart.c | 12 +++-
 drivers/tty/serial/stm32-usart.h |  1 +
 2 files changed, 8 insertions(+), 5 deletions(-)

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, , _res, threaded)) {
+   while (stm32_pending_rx(port, , _port->last_res, threaded)) {
sr |= USART_SR_DUMMY_RX;
-   c = stm32_get_char(port, , _res);
+   c = stm32_get_char(port, , _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(>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 _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;
 };
-- 
1.9.1

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

[Bich HEMON]

From: Gerald Baeza 

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

Signed-off-by: Gerald Baeza 
Signed-off-by: Bich Hemon 
---
 drivers/tty/serial/stm32-usart.c | 12 +++-
 drivers/tty/serial/stm32-usart.h |  1 +
 2 files changed, 8 insertions(+), 5 deletions(-)

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, , _res, threaded)) {
+   while (stm32_pending_rx(port, , _port->last_res, threaded)) {
sr |= USART_SR_DUMMY_RX;
-   c = stm32_get_char(port, , _res);
+   c = stm32_get_char(port, , _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(>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 _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;
 };
-- 
1.9.1