Hi Miquel, On ven., oct. 06 2017, Miquel Raynal <miquel.raynal@xxxxxxxxxxxxxxxxxx> wrote: > 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> Reviewed-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx> Thanks, Gregory > --- > 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 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- 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
