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serial: stm32: fix multi-ports management 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gerald Baeza 2017-07-13 15:08:27 +00:00 committed by Greg Kroah-Hartman
parent 3e5fcbacee
commit e570791596
2 changed files with 8 additions and 5 deletions
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12
drivers/tty/serial/stm32-usart.c
View File

@ -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];
}

1
drivers/tty/serial/stm32-usart.h
View File

@ -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;
};