From 9c3d3ee1239bab92d509f334530796d0ced4ca98 Mon Sep 17 00:00:00 2001 From: Allen Yan Date: Fri, 13 Oct 2017 11:01:50 +0200 Subject: serial: mvebu-uart: add soft reset at probe The existing UART driver relies on the bootloader to initialize the port(s). However, the secondary uart port may not be initialized properly in early boot stage. This patch adds the UART soft reset when probing, for all ports. Signed-off-by: Allen Yan Signed-off-by: Miquel Raynal Reviewed-by: Gregory CLEMENT Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mvebu-uart.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'drivers/tty') diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 900fe85796d6..e233f464d55a 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -660,6 +660,11 @@ static int mvebu_uart_probe(struct platform_device *pdev) port->private_data = mvuart; platform_set_drvdata(pdev, mvuart); + /* UART Soft Reset*/ + writel(CTRL_SOFT_RST, port->membase + UART_CTRL(port)); + udelay(1); + writel(0, port->membase + UART_CTRL(port)); + ret = uart_add_one_port(&mvebu_uart_driver, port); if (ret) return ret; -- cgit v1.2.3