Commit f4518a8a authored by Erwan Le Ray's avatar Erwan Le Ray Committed by Greg Kroah-Hartman
Browse files

serial: stm32: fix startup by enabling usart for reception 



RX is configured, but usart is not enabled in startup function.
Kernel documentation specifies that startup should enable the port for
reception.
Fix the startup by enabling usart for reception.

Fixes: 84872dc4 ("serial: stm32: add RX and TX FIFO flush")
Signed-off-by: default avatarErwan Le Ray <erwan.leray@foss.st.com>
Link: https://lore.kernel.org/r/20210304162308.8984-3-erwan.leray@foss.st.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 87fd0741

drivers/tty/serial/stm32-usart.c

+2 −1
Original line number Diff line number Diff line
@@ -634,6 +634,7 @@ static int stm32_usart_startup(struct uart_port *port) 
{

	struct stm32_port *stm32_port = to_stm32_port(port);

	const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;

	const struct stm32_usart_config *cfg = &stm32_port->info->cfg;

	const char *name = to_platform_device(port->dev)->name;

	u32 val;

	int ret;
@@ -658,7 +659,7 @@ static int stm32_usart_startup(struct uart_port *port) 
	}



	/* RX FIFO enabling */

	val = stm32_port->cr1_irq | USART_CR1_RE;

	val = stm32_port->cr1_irq | USART_CR1_RE | BIT(cfg->uart_enable_bit);

	if (stm32_port->fifoen)

		val |= USART_CR1_FIFOEN;

	stm32_usart_set_bits(port, ofs->cr1, val);