Re: [PATCH 06/16] serial: mvebu-uart: add soft reset at probe
From: Gregory CLEMENT <hidden>
Date: 2017-10-06 12:33:03
Also in:
linux-arm-kernel, linux-devicetree, linux-gpio
Hi Miquel, On ven., oct. 06 2017, Miquel Raynal [off-list ref] wrote:
From: Allen Yan <redacted> 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 <redacted> Signed-off-by: Miquel Raynal <redacted>
Reviewed-by: Gregory CLEMENT <redacted> Thanks, Gregory
quoted hunk
--- 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@lists.infradead.org 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