diff mbox series

[v4] watchdog: imx2_wdg: Allow ping on suspend

Message ID 20220323115752.360409-1-alistair@alistair23.me
State Superseded
Headers show
Series [v4] watchdog: imx2_wdg: Allow ping on suspend | expand

Commit Message

Alistair March 23, 2022, 11:57 a.m. UTC
The i.MX watchdog cannot be disabled by software once it has been
enabled. This means that it can't be stopped before suspend.

For systems that enter low power mode this is fine, as the watchdog will
be automatically stopped by hardware in low power mode. Not all i.MX
platforms support low power mode in the mainline kernel. For example the
i.MX7D does not enter low power mode and so will be rebooted 2 minutes
after entering sleep states.

This patch introduces a device tree property "fsl,ping-during-suspend"
that can be used to enable ping on suspend support for these systems.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/watchdog/imx2_wdt.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

Comments

Guenter Roeck March 23, 2022, 1:07 p.m. UTC | #1
On 3/23/22 04:57, Alistair Francis wrote:
> The i.MX watchdog cannot be disabled by software once it has been
> enabled. This means that it can't be stopped before suspend.
> 
> For systems that enter low power mode this is fine, as the watchdog will
> be automatically stopped by hardware in low power mode. Not all i.MX
> platforms support low power mode in the mainline kernel. For example the
> i.MX7D does not enter low power mode and so will be rebooted 2 minutes
> after entering sleep states.
> 
> This patch introduces a device tree property "fsl,ping-during-suspend"
> that can be used to enable ping on suspend support for these systems.
> 
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>

What is the difference to earlier versions ?

Guenter
Alistair March 23, 2022, 9:08 p.m. UTC | #2
On Wed, 23 Mar 2022, at 11:07 PM, Guenter Roeck wrote:
> On 3/23/22 04:57, Alistair Francis wrote:
> > The i.MX watchdog cannot be disabled by software once it has been
> > enabled. This means that it can't be stopped before suspend.
> > 
> > For systems that enter low power mode this is fine, as the watchdog will
> > be automatically stopped by hardware in low power mode. Not all i.MX
> > platforms support low power mode in the mainline kernel. For example the
> > i.MX7D does not enter low power mode and so will be rebooted 2 minutes
> > after entering sleep states.
> > 
> > This patch introduces a device tree property "fsl,ping-during-suspend"
> > that can be used to enable ping on suspend support for these systems.
> > 
> > Signed-off-by: Alistair Francis <alistair@alistair23.me>
> > Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> 
> What is the difference to earlier versions ?

Sorry, I should have included a changelog.

I just fixed the spelling of alow/allow in the title

Alistair

> 
> Guenter
>
Sascha Hauer March 28, 2022, 8:01 a.m. UTC | #3
Hi,

On Wed, Mar 23, 2022 at 09:57:52PM +1000, Alistair Francis wrote:
> The i.MX watchdog cannot be disabled by software once it has been
> enabled. This means that it can't be stopped before suspend.
> 
> For systems that enter low power mode this is fine, as the watchdog will
> be automatically stopped by hardware in low power mode. Not all i.MX
> platforms support low power mode in the mainline kernel. For example the
> i.MX7D does not enter low power mode and so will be rebooted 2 minutes
> after entering sleep states.
> 
> This patch introduces a device tree property "fsl,ping-during-suspend"
> that can be used to enable ping on suspend support for these systems.

This doesn't match the code anymore.

Sascha

> 
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  drivers/watchdog/imx2_wdt.c | 27 ++++++++++++++++++++-------
>  1 file changed, 20 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
> index 51bfb796898b..d0c5d47ddede 100644
> --- a/drivers/watchdog/imx2_wdt.c
> +++ b/drivers/watchdog/imx2_wdt.c
> @@ -66,6 +66,7 @@ struct imx2_wdt_device {
>  	struct watchdog_device wdog;
>  	bool ext_reset;
>  	bool clk_is_on;
> +	bool no_ping;
>  };
>  
>  static bool nowayout = WATCHDOG_NOWAYOUT;
> @@ -312,12 +313,18 @@ static int __init imx2_wdt_probe(struct platform_device *pdev)
>  
>  	wdev->ext_reset = of_property_read_bool(dev->of_node,
>  						"fsl,ext-reset-output");
> +	/*
> +	 * The i.MX7D doesn't support low power mode, so we need to ping the watchdog
> +	 * during suspend.
> +	 */
> +	wdev->no_ping = !of_device_is_compatible(dev->of_node, "fsl,imx7d-wdt");
>  	platform_set_drvdata(pdev, wdog);
>  	watchdog_set_drvdata(wdog, wdev);
>  	watchdog_set_nowayout(wdog, nowayout);
>  	watchdog_set_restart_priority(wdog, 128);
>  	watchdog_init_timeout(wdog, timeout, dev);
> -	watchdog_stop_ping_on_suspend(wdog);
> +	if (wdev->no_ping)
> +		watchdog_stop_ping_on_suspend(wdog);
>  
>  	if (imx2_wdt_is_running(wdev)) {
>  		imx2_wdt_set_timeout(wdog, wdog->timeout);
> @@ -366,9 +373,11 @@ static int __maybe_unused imx2_wdt_suspend(struct device *dev)
>  		imx2_wdt_ping(wdog);
>  	}
>  
> -	clk_disable_unprepare(wdev->clk);
> +	if (wdev->no_ping) {
> +		clk_disable_unprepare(wdev->clk);
>  
> -	wdev->clk_is_on = false;
> +		wdev->clk_is_on = false;
> +	}
>  
>  	return 0;
>  }
> @@ -380,11 +389,14 @@ static int __maybe_unused imx2_wdt_resume(struct device *dev)
>  	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
>  	int ret;
>  
> -	ret = clk_prepare_enable(wdev->clk);
> -	if (ret)
> -		return ret;
> +	if (wdev->no_ping) {
> +		ret = clk_prepare_enable(wdev->clk);
>  
> -	wdev->clk_is_on = true;
> +		if (ret)
> +			return ret;
> +
> +		wdev->clk_is_on = true;
> +	}
>  
>  	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
>  		/*
> @@ -407,6 +419,7 @@ static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
>  
>  static const struct of_device_id imx2_wdt_dt_ids[] = {
>  	{ .compatible = "fsl,imx21-wdt", },
> +	{ .compatible = "fsl,imx7d-wdt", },
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);
> -- 
> 2.35.1
> 
>
diff mbox series

Patch

diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 51bfb796898b..d0c5d47ddede 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -66,6 +66,7 @@  struct imx2_wdt_device {
 	struct watchdog_device wdog;
 	bool ext_reset;
 	bool clk_is_on;
+	bool no_ping;
 };
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -312,12 +313,18 @@  static int __init imx2_wdt_probe(struct platform_device *pdev)
 
 	wdev->ext_reset = of_property_read_bool(dev->of_node,
 						"fsl,ext-reset-output");
+	/*
+	 * The i.MX7D doesn't support low power mode, so we need to ping the watchdog
+	 * during suspend.
+	 */
+	wdev->no_ping = !of_device_is_compatible(dev->of_node, "fsl,imx7d-wdt");
 	platform_set_drvdata(pdev, wdog);
 	watchdog_set_drvdata(wdog, wdev);
 	watchdog_set_nowayout(wdog, nowayout);
 	watchdog_set_restart_priority(wdog, 128);
 	watchdog_init_timeout(wdog, timeout, dev);
-	watchdog_stop_ping_on_suspend(wdog);
+	if (wdev->no_ping)
+		watchdog_stop_ping_on_suspend(wdog);
 
 	if (imx2_wdt_is_running(wdev)) {
 		imx2_wdt_set_timeout(wdog, wdog->timeout);
@@ -366,9 +373,11 @@  static int __maybe_unused imx2_wdt_suspend(struct device *dev)
 		imx2_wdt_ping(wdog);
 	}
 
-	clk_disable_unprepare(wdev->clk);
+	if (wdev->no_ping) {
+		clk_disable_unprepare(wdev->clk);
 
-	wdev->clk_is_on = false;
+		wdev->clk_is_on = false;
+	}
 
 	return 0;
 }
@@ -380,11 +389,14 @@  static int __maybe_unused imx2_wdt_resume(struct device *dev)
 	struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
 	int ret;
 
-	ret = clk_prepare_enable(wdev->clk);
-	if (ret)
-		return ret;
+	if (wdev->no_ping) {
+		ret = clk_prepare_enable(wdev->clk);
 
-	wdev->clk_is_on = true;
+		if (ret)
+			return ret;
+
+		wdev->clk_is_on = true;
+	}
 
 	if (watchdog_active(wdog) && !imx2_wdt_is_running(wdev)) {
 		/*
@@ -407,6 +419,7 @@  static SIMPLE_DEV_PM_OPS(imx2_wdt_pm_ops, imx2_wdt_suspend,
 
 static const struct of_device_id imx2_wdt_dt_ids[] = {
 	{ .compatible = "fsl,imx21-wdt", },
+	{ .compatible = "fsl,imx7d-wdt", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);