[PATCH 8/8] serial: stm32: update transmission complete error message in shutdown

Erwan Le Ray
2020-12-18T19:02:20Z

The transmission complete error message provides the status of the
ISR_USART_TC bit. This bit, when set, indicates that the transmission
has not been completed.
The bit status indication is not a very understandable information.
The error message sent on console should indicate that the transmission is
not complete, instead of providing USART_TC bit status.
Update the error message and add a comment for better understanding.

Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 9d73f6976586..6a9a5ef5f5ba 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -687,8 +687,9 @@ static void stm32_usart_shutdown(struct uart_port *port)
isr, (isr & USART_SR_TC),
10, 100000);

+ /* Send the TC error message only when ISR_TC is not set */
if (ret)
- dev_err(port->dev, "transmission complete not set\n");
+ dev_err(port->dev, "Transmission is not complete\n");

stm32_usart_clr_bits(port, ofs->cr1, val);

--
2.17.1