openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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 <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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/tty/serial/mvebu-uart.c
View File

@ -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;