From: Erwan Le Ray Date: Thu, 4 Mar 2021 16:22:57 +0000 (+0100) Subject: serial: stm32: fix startup by enabling usart for reception X-Git-Tag: v5.11.21~454 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d63ce3879306e506bc58319d234a89c635e213c3;p=thirdparty%2Fkernel%2Fstable.git serial: stm32: fix startup by enabling usart for reception [ Upstream commit f4518a8a75f5be1a121b0c95ad9c6b1eb27d920e ] 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 Link: https://lore.kernel.org/r/20210304162308.8984-3-erwan.leray@foss.st.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 1f7fe285bb1fe..909a0d991ba1d 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -633,6 +633,7 @@ 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; @@ -657,7 +658,7 @@ 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);