From: Allen Yan <yanwei@xxxxxxxxxxx> 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 <yanwei@xxxxxxxxxxx> Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxxxxxxxxx> --- drivers/tty/serial/mvebu-uart.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 82438884af1e..da756cfec0bb 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -653,6 +653,11 @@ 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; -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
