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serial: mvebu-uart: add soft reset at probe

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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@marvell.com>
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Allen Yan 2017-10-13 11:01:50 +02:00 committed by Greg Kroah-Hartman
parent 5218d76958
commit 9c3d3ee123
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/mvebu-uart.c
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@ -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;