From: Bich Hemon <bich.hemon@xxxxxx>
Fifo is available starting with stm32h7. Add has_fifo flag to use fifo
only when possible.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
---
drivers/tty/serial/stm32-usart.c | 9 ++++++++-
drivers/tty/serial/stm32-usart.h | 2 ++
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 05d89b0..d241056 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -49,6 +49,10 @@ static void stm32_serial_debugfs(struct stm32_port *stm32port,
{
struct device *dev = stm32port->port.dev;
+ /* For now, debugfs is only used for fifo, then skip if unsupported */
+ if (!stm32port->info->cfg.has_fifo)
+ return;
+
if (!stm32_debugfs_root)
stm32_debugfs_root = debugfs_create_dir("usart-stm32", NULL);
@@ -63,6 +67,9 @@ static void stm32_serial_debugfs(struct stm32_port *stm32port,
static void stm32_serial_debugfs_rm(struct stm32_port *stm32port)
{
+ if (!stm32port->info->cfg.has_fifo)
+ return;
+
debugfs_remove_recursive(stm32port->debugfs_dir);
if (atomic_dec_and_test(&stm32_debugfs_cnt)) {
debugfs_remove_recursive(stm32_debugfs_root);
@@ -775,6 +782,7 @@ static int stm32_init_port(struct stm32_port *stm32port,
port->dev = &pdev->dev;
port->irq = platform_get_irq(pdev, 0);
stm32port->wakeirq = platform_get_irq(pdev, 1);
+ stm32port->fifoen = stm32port->info->cfg.has_fifo;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
port->membase = devm_ioremap_resource(&pdev->dev, res);
@@ -824,7 +832,6 @@ 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;
stm32_ports[id].rx_irq = USART_CR1_RXNEIE;
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 98dbf38..25ed28b 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -25,6 +25,7 @@ struct stm32_usart_config {
u8 uart_enable_bit; /* USART_CR1_UE */
bool has_7bits_data;
bool has_wakeup;
+ bool has_fifo;
};
struct stm32_usart_info {
@@ -93,6 +94,7 @@ struct stm32_usart_info stm32h7_info = {
.uart_enable_bit = 0,
.has_7bits_data = true,
.has_wakeup = true,
+ .has_fifo = true,
}
};
--
1.9.1
--
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