diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index a1e31913bcf9..2384f786b76d 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -180,21 +180,6 @@ static void stm32_tx_dma_complete(void *arg)
 	struct uart_port *port = arg;
 	struct stm32_port *stm32port = to_stm32_port(port);
 	struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
-	unsigned int isr;
-	int ret;
-
-	ret = readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr,
-						isr,
-						(isr & USART_SR_TC),
-						10, 100000);
-
-	if (ret)
-		dev_err(port->dev, "terminal count not set\n");
-
-	if (ofs->icr == UNDEF_REG)
-		stm32_clr_bits(port, ofs->isr, USART_SR_TC);
-	else
-		stm32_set_bits(port, ofs->icr, USART_CR_TC);
 
 	stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
 	stm32port->tx_dma_busy = false;
@@ -286,7 +271,6 @@ static void stm32_transmit_chars_dma(struct uart_port *port)
 	/* Issue pending DMA TX requests */
 	dma_async_issue_pending(stm32port->tx_ch);
 
-	stm32_clr_bits(port, ofs->isr, USART_SR_TC);
 	stm32_set_bits(port, ofs->cr3, USART_CR3_DMAT);
 
 	xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
@@ -315,6 +299,11 @@ static void stm32_transmit_chars(struct uart_port *port)
 		return;
 	}
 
+	if (ofs->icr == UNDEF_REG)
+		stm32_clr_bits(port, ofs->isr, USART_SR_TC);
+	else
+		stm32_set_bits(port, ofs->icr, USART_ICR_TCCF);
+
 	if (stm32_port->tx_ch)
 		stm32_transmit_chars_dma(port);
 	else
@@ -491,12 +480,21 @@ static void stm32_shutdown(struct uart_port *port)
 	struct stm32_port *stm32_port = to_stm32_port(port);
 	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
 	struct stm32_usart_config *cfg = &stm32_port->info->cfg;
-	u32 val;
+	u32 val, isr;
+	int ret;
 
 	val = USART_CR1_TXEIE | USART_CR1_RXNEIE | USART_CR1_TE | USART_CR1_RE;
 	val |= BIT(cfg->uart_enable_bit);
 	if (stm32_port->fifoen)
 		val |= USART_CR1_FIFOEN;
+
+	ret = readl_relaxed_poll_timeout(port->membase + ofs->isr,
+					 isr, (isr & USART_SR_TC),
+					 10, 100000);
+
+	if (ret)
+		dev_err(port->dev, "transmission complete not set\n");
+
 	stm32_clr_bits(port, ofs->cr1, val);
 
 	dev_pm_clear_wake_irq(port->dev);