linux-kernel - [PATCH] serial: stm32: add support for break control

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Message-ID: <20230906151547.840302-1-valentin.caron@foss.st.com>
Date:   Wed, 6 Sep 2023 17:15:47 +0200
From:   Valentin Caron <valentin.caron@...s.st.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
CC:     Erwan Le Ray <erwan.leray@...s.st.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Valentin Caron <valentin.caron@...s.st.com>
Subject: [PATCH] serial: stm32: add support for break control

From: Erwan Le Ray <erwan.leray@...s.st.com>

Add support for break control to the stm32 serial driver.

Signed-off-by: Erwan Le Ray <erwan.leray@...s.st.com>
Signed-off-by: Valentin Caron <valentin.caron@...s.st.com>
---
 drivers/tty/serial/stm32-usart.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 5e9cf0c48813..d03ec69d79fc 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1047,9 +1047,20 @@ static void stm32_usart_stop_rx(struct uart_port *port)
 		stm32_usart_clr_bits(port, ofs->cr3, stm32_port->cr3_irq);
 }
 
-/* Handle breaks - ignored by us */
 static void stm32_usart_break_ctl(struct uart_port *port, int break_state)
 {
+	struct stm32_port *stm32_port = to_stm32_port(port);
+	const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
+	unsigned long flags;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (break_state)
+		stm32_usart_set_bits(port, ofs->rqr, USART_RQR_SBKRQ);
+	else
+		stm32_usart_clr_bits(port, ofs->rqr, USART_RQR_SBKRQ);
+
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static int stm32_usart_startup(struct uart_port *port)
-- 
2.25.1