[PATCH v2 1/1] watchdog: mtk_wdt: Remove mtk_wdt_stop() in probe() to prevent the system freeze and it doesn't reboot by watchdog problem

[PATCH v2 1/1] watchdog: mtk_wdt: Remove mtk_wdt_stop() in probe() to prevent the system freeze and it doesn't reboot by watchdog problem

[Freddy Hsin]

From: "freddy.hsin" <freddy.hsin@mediatek.com>

Before user space daemon start to access the watchdog device,
there is a time interval that watchdog is disabled in the
original flow. If the system freezing at this interval, it
cannot be rebooted by watchdog hardware automatically.

In order to solve this problem, the watchdog hardware should be
kept working, and start hrtimer in framework to ping it by
setting max_hw_heartbeat_ms and HW_RUNNING used in
watchdog_need_worker to determine whether the worker should be
started or not. Besides the redundant setting of max_timeout is
also removed.

Signed-off-by: freddy.hsin <freddy.hsin@mediatek.com>
---
 drivers/watchdog/mtk_wdt.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index d6a6393..0c869b7 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -195,6 +195,19 @@ static int mtk_wdt_set_timeout(struct watchdog_device *wdt_dev,
 	return 0;
 }
 
+static void mtk_wdt_init(struct watchdog_device *wdt_dev)
+{
+	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
+	void __iomem *wdt_base;
+
+	wdt_base = mtk_wdt->wdt_base;
+
+	if (readl(wdt_base + WDT_MODE) & WDT_MODE_EN) {
+		set_bit(WDOG_HW_RUNNING, &wdt_dev->status);
+		mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	}
+}
+
 static int mtk_wdt_stop(struct watchdog_device *wdt_dev)
 {
 	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
@@ -264,7 +277,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
 	mtk_wdt->wdt_dev.info = &mtk_wdt_info;
 	mtk_wdt->wdt_dev.ops = &mtk_wdt_ops;
 	mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT;
-	mtk_wdt->wdt_dev.max_timeout = WDT_MAX_TIMEOUT;
+	mtk_wdt->wdt_dev.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT * 1000;
 	mtk_wdt->wdt_dev.min_timeout = WDT_MIN_TIMEOUT;
 	mtk_wdt->wdt_dev.parent = dev;
 
@@ -274,7 +287,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
 
 	watchdog_set_drvdata(&mtk_wdt->wdt_dev, mtk_wdt);
 
-	mtk_wdt_stop(&mtk_wdt->wdt_dev);
+	mtk_wdt_init(&mtk_wdt->wdt_dev);
 
 	watchdog_stop_on_reboot(&mtk_wdt->wdt_dev);
 	err = devm_watchdog_register_device(dev, &mtk_wdt->wdt_dev);
-- 
1.7.9.5

Re: [PATCH v2 1/1] watchdog: mtk_wdt: Remove mtk_wdt_stop() in probe() to prevent the system freeze and it doesn't reboot by watchdog problem

[Guenter Roeck]

On 12/30/20 12:15 AM, Freddy Hsin wrote:
> From: "freddy.hsin" <freddy.hsin@mediatek.com>
> 
> Before user space daemon start to access the watchdog device,
> there is a time interval that watchdog is disabled in the
> original flow. If the system freezing at this interval, it
> cannot be rebooted by watchdog hardware automatically.
> 
> In order to solve this problem, the watchdog hardware should be
> kept working, and start hrtimer in framework to ping it by
> setting max_hw_heartbeat_ms and HW_RUNNING used in
> watchdog_need_worker to determine whether the worker should be
> started or not. Besides the redundant setting of max_timeout is
> also removed.
> 
> Signed-off-by: freddy.hsin <freddy.hsin@mediatek.com>
> ---

Change log goes here.

Looks good though.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

>  drivers/watchdog/mtk_wdt.c |   17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index d6a6393..0c869b7 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -195,6 +195,19 @@ static int mtk_wdt_set_timeout(struct watchdog_device *wdt_dev,
>  	return 0;
>  }
>  
> +static void mtk_wdt_init(struct watchdog_device *wdt_dev)
> +{
> +	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
> +	void __iomem *wdt_base;
> +
> +	wdt_base = mtk_wdt->wdt_base;
> +
> +	if (readl(wdt_base + WDT_MODE) & WDT_MODE_EN) {
> +		set_bit(WDOG_HW_RUNNING, &wdt_dev->status);
> +		mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
> +	}
> +}
> +
>  static int mtk_wdt_stop(struct watchdog_device *wdt_dev)
>  {
>  	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
> @@ -264,7 +277,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
>  	mtk_wdt->wdt_dev.info = &mtk_wdt_info;
>  	mtk_wdt->wdt_dev.ops = &mtk_wdt_ops;
>  	mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT;
> -	mtk_wdt->wdt_dev.max_timeout = WDT_MAX_TIMEOUT;
> +	mtk_wdt->wdt_dev.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT * 1000;
>  	mtk_wdt->wdt_dev.min_timeout = WDT_MIN_TIMEOUT;
>  	mtk_wdt->wdt_dev.parent = dev;
>  
> @@ -274,7 +287,7 @@ static int mtk_wdt_probe(struct platform_device *pdev)
>  
>  	watchdog_set_drvdata(&mtk_wdt->wdt_dev, mtk_wdt);
>  
> -	mtk_wdt_stop(&mtk_wdt->wdt_dev);
> +	mtk_wdt_init(&mtk_wdt->wdt_dev);
>  
>  	watchdog_stop_on_reboot(&mtk_wdt->wdt_dev);
>  	err = devm_watchdog_register_device(dev, &mtk_wdt->wdt_dev);
>