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

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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>
This commit is contained in:
Anson Huang 2018-09-05 09:24:27 +08:00 committed by Greg Kroah-Hartman
parent 07b5e16e98
commit fcfed1be53
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/imx.c
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@ -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)
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)
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;