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* [PATCH v2.1] watchdog: make DesignWare watchdog allow users to set bigger timeout value
@ 2019-11-25  2:04 Wang, Peng 1. (NSB - CN/Hangzhou)
  2019-11-25  5:35 ` Guenter Roeck
  0 siblings, 1 reply; 2+ messages in thread
From: Wang, Peng 1. (NSB - CN/Hangzhou) @ 2019-11-25  2:04 UTC (permalink / raw)
  To: Guenter Roeck, Guenter Roeck; +Cc: wim, linux-watchdog, linux-kernel

From aabaa4b709bd451e566c906e8d1dca48f92f9b12 Mon Sep 17 00:00:00 2001
From: Peng Wang <peng.1.wang@nokia-sbell.com>
Date: Wed, 20 Nov 2019 15:12:59 +0800
Subject: [PATCH v2.1] watchdog: make DesignWare watchdog allow users to set bigger
 timeout value

watchdog_dev.c provides means to allow users to set bigger timeout value
than HW can support, make DesignWare watchdog align with this.

Signed-off-by: Peng Wang <peng.1.wang@nokia-sbell.com>
---

v2 -> v2.1:
    - move Signed-off-by to be ahead of section separator

v1 -> v2:
    - use top_s to compare with wdd->max_hw_heartbeat_ms
    - update wdd->timeout in case it's greater than HW supports
    - fix comments error

v1: initial version

---
 drivers/watchdog/dw_wdt.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index fef7c61..12c116e 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -114,7 +114,15 @@ static int dw_wdt_set_timeout(struct watchdog_device *wdd, unsigned int top_s)
 	writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT,
 	       dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
 
-	wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
+	/*
+	 * In case users set bigger timeout value than HW can support,
+	 * kernel(watchdog_dev.c) helps to feed watchdog before
+	 * wdd->max_hw_heartbeat_ms
+	 */
+	if (top_s * 1000 <= wdd->max_hw_heartbeat_ms)
+		wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
+	else
+		wdd->timeout = top_s;
 
 	return 0;
 }
-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v2.1] watchdog: make DesignWare watchdog allow users to set bigger timeout value
  2019-11-25  2:04 [PATCH v2.1] watchdog: make DesignWare watchdog allow users to set bigger timeout value Wang, Peng 1. (NSB - CN/Hangzhou)
@ 2019-11-25  5:35 ` Guenter Roeck
  0 siblings, 0 replies; 2+ messages in thread
From: Guenter Roeck @ 2019-11-25  5:35 UTC (permalink / raw)
  To: Wang, Peng 1. (NSB - CN/Hangzhou)
  Cc: Guenter Roeck, Guenter Roeck, wim, linux-watchdog, linux-kernel

On Mon, Nov 25, 2019 at 02:04:13AM +0000, Wang, Peng 1. (NSB - CN/Hangzhou) wrote:
> From aabaa4b709bd451e566c906e8d1dca48f92f9b12 Mon Sep 17 00:00:00 2001
> From: Peng Wang <peng.1.wang@nokia-sbell.com>
> Date: Wed, 20 Nov 2019 15:12:59 +0800
> Subject: [PATCH v2.1] watchdog: make DesignWare watchdog allow users to set bigger
>  timeout value
> 
> watchdog_dev.c provides means to allow users to set bigger timeout value
> than HW can support, make DesignWare watchdog align with this.
> 
> Signed-off-by: Peng Wang <peng.1.wang@nokia-sbell.com>

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

> ---
> 
> v2 -> v2.1:
>     - move Signed-off-by to be ahead of section separator
> 
> v1 -> v2:
>     - use top_s to compare with wdd->max_hw_heartbeat_ms
>     - update wdd->timeout in case it's greater than HW supports
>     - fix comments error
> 
> v1: initial version
> 
> ---
>  drivers/watchdog/dw_wdt.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
> index fef7c61..12c116e 100644
> --- a/drivers/watchdog/dw_wdt.c
> +++ b/drivers/watchdog/dw_wdt.c
> @@ -114,7 +114,15 @@ static int dw_wdt_set_timeout(struct watchdog_device *wdd, unsigned int top_s)
>  	writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT,
>  	       dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
>  
> -	wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
> +	/*
> +	 * In case users set bigger timeout value than HW can support,
> +	 * kernel(watchdog_dev.c) helps to feed watchdog before
> +	 * wdd->max_hw_heartbeat_ms
> +	 */
> +	if (top_s * 1000 <= wdd->max_hw_heartbeat_ms)
> +		wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
> +	else
> +		wdd->timeout = top_s;
>  
>  	return 0;
>  }
> -- 
> 1.8.3.1
> 

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2019-11-25  2:04 [PATCH v2.1] watchdog: make DesignWare watchdog allow users to set bigger timeout value Wang, Peng 1. (NSB - CN/Hangzhou)
2019-11-25  5:35 ` Guenter Roeck

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