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Date:   Fri, 18 Dec 2020 20:00:19 +0100
From:   Erwan Le Ray <>
To:     Greg Kroah-Hartman <>,
        Jiri Slaby <>, Rob Herring <>,
        Maxime Coquelin <>,
        Alexandre Torgue <>
CC:     <>, <>,
        Erwan Le Ray <>,
        Fabrice Gasnier <>,
        Valentin Caron <>
Subject: [PATCH 8/8] serial: stm32: update transmission complete error message in shutdown

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 <>

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);

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