diff options
| author |   Anson Huang <Anson.Huang@nxp.com> | 2018-09-05 09:24:27 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-18 16:07:24 +0200 |
| commit | fcfed1be53e014b9d707ca4520bb1591c2700f2e (patch) | |
| tree | b834b4071167d99abc1c97bdd99978267d2fff27 /drivers/tty/serial/imx.c | |
| parent | tty: serial: imx: add lock for registers save/restore (diff) | |
| download | linux-dev-fcfed1be53e014b9d707ca4520bb1591c2700f2e.tar.xz linux-dev-fcfed1be53e014b9d707ca4520bb1591c2700f2e.zip | |
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: 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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/tty/serial/imx.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 2634272ad0fb..4341589e0aab 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> @@ -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; |