From: Anson Huang <Anson.Huang@nxp.com>
To: gregkh@linuxfoundation.org, jslaby@suse.com,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
u.kleine-koenig@pengutronix.de
Cc: Linux-imx@nxp.com
Subject: [PATCH V2 2/2] tty: serial: imx: add pinctrl sleep/default mode switch for suspend
Date: Wed, 5 Sep 2018 09:24:27 +0800 [thread overview]
Message-ID: <1536110667-23530-2-git-send-email-Anson.Huang@nxp.com> (raw)
In-Reply-To: <1536110667-23530-1-git-send-email-Anson.Huang@nxp.com>
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>
---
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 c15332d..6ccb5c4 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>
@@ -2449,6 +2450,8 @@ static int imx_uart_suspend_noirq(struct device *dev)
clk_disable(sport->clk_ipg);
+ pinctrl_pm_select_sleep_state(dev);
+
return 0;
}
@@ -2457,6 +2460,8 @@ 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
next prev parent reply other threads:[~2018-09-05 1:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-05 1:24 [PATCH V2 1/2] tty: serial: imx: add lock for registers save/restore Anson Huang
2018-09-05 1:24 ` Anson Huang [this message]
2018-09-05 5:55 ` [PATCH V2 2/2] tty: serial: imx: add pinctrl sleep/default mode switch for suspend Uwe Kleine-König
2018-09-05 5:54 ` [PATCH V2 1/2] tty: serial: imx: add lock for registers save/restore Uwe Kleine-König
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