tty: serial: imx: add pinctrl sleep/default mode switch for suspend (fcfed1be) · Commits · 戴 / test

On some i.MX SoCs' low power mode, such as i.MX7D's LPSR(low power state retention), UART iomux settings will be lost, need to add pinctrl sleep/default mode switch during suspend/resume to make sure UART iomux settings are correct after resume. Signed-off-by:

Anson Huang <Anson.Huang@nxp.com> Acked-by:

Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/imx.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <linux/serial.h>
		#include <linux/clk.h>
		#include <linux/delay.h>
		#include <linux/pinctrl/consumer.h>
		#include <linux/rational.h>
		#include <linux/slab.h>
		#include <linux/of.h>
		@@ -2444,6 +2445,8 @@ static int imx_uart_suspend_noirq(struct device *dev)

		clk_disable(sport->clk_ipg);

		pinctrl_pm_select_sleep_state(dev);

		return 0;
		}

		@@ -2452,6 +2455,8 @@ static int imx_uart_resume_noirq(struct device *dev)
		struct imx_port *sport = dev_get_drvdata(dev);
		int ret;

		pinctrl_pm_select_default_state(dev);

		ret = clk_enable(sport->clk_ipg);
		if (ret)
		return ret;

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