Commit fcfed1be authored by Anson Huang's avatar Anson Huang Committed by Greg Kroah-Hartman

tty: serial: imx: add pinctrl sleep/default mode switch for suspend

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: default avatarAnson Huang <Anson.Huang@nxp.com>
Acked-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 07b5e16e
...@@ -24,6 +24,7 @@ ...@@ -24,6 +24,7 @@
#include <linux/serial.h> #include <linux/serial.h>
#include <linux/clk.h> #include <linux/clk.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/pinctrl/consumer.h>
#include <linux/rational.h> #include <linux/rational.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/of.h> #include <linux/of.h>
...@@ -2444,6 +2445,8 @@ static int imx_uart_suspend_noirq(struct device *dev) ...@@ -2444,6 +2445,8 @@ static int imx_uart_suspend_noirq(struct device *dev)
clk_disable(sport->clk_ipg); clk_disable(sport->clk_ipg);
pinctrl_pm_select_sleep_state(dev);
return 0; return 0;
} }
...@@ -2452,6 +2455,8 @@ static int imx_uart_resume_noirq(struct device *dev) ...@@ -2452,6 +2455,8 @@ static int imx_uart_resume_noirq(struct device *dev)
struct imx_port *sport = dev_get_drvdata(dev); struct imx_port *sport = dev_get_drvdata(dev);
int ret; int ret;
pinctrl_pm_select_default_state(dev);
ret = clk_enable(sport->clk_ipg); ret = clk_enable(sport->clk_ipg);
if (ret) if (ret)
return ret; return ret;
......
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