[PATCH v2 02/13] serial: stm32: fix startup by enabling usart for reception

[Erwan Le Ray]

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: 84872dc448fe ("serial: stm32: add RX and TX FIFO flush")
Signed-off-by: Erwan Le Ray <erwan.le...@foss.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 3d58824ac2af..c6ca8f964c69 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -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);
-- 
2.17.1