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serial: stm32: add support for break control

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Add support for break control to the stm32 serial driver.

Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230906151547.840302-1-valentin.caron@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Erwan Le Ray 2023-09-06 17:15:47 +02:00 committed by Greg Kroah-Hartman
parent 46c4699d07
commit 30e945861f
1 changed files with 12 additions and 1 deletions
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13
drivers/tty/serial/stm32-usart.c
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@ -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)