Gentle Ping... Anson Huang Best Regards! > -----Original Message----- > From: Anson Huang > Sent: Thursday, August 9, 2018 6:06 PM > To: gregkh@xxxxxxxxxxxxxxxxxxx; jslaby@xxxxxxxx; > linux-serial@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx > Cc: dl-linux-imx <linux-imx@xxxxxxx> > Subject: [PATCH 2/2] tty: serial: imx: add pinctrl sleep/default mode switch for > suspend > > On some i.MX SoCs' low power mode, UART iomux settings may 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@xxxxxxx> > --- > drivers/tty/serial/imx.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index > a09ccef..c280d43 100644 > --- a/drivers/tty/serial/imx.c > +++ b/drivers/tty/serial/imx.c > @@ -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> > @@ -2447,6 +2448,8 @@ static int imx_uart_suspend_noirq(struct device > *dev) > > clk_disable(sport->clk_ipg); > > + pinctrl_pm_select_sleep_state(dev); > + > return 0; > } > > @@ -2455,6 +2458,8 @@ 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; > -- > 2.7.4
