linux-kernel - Re: [PATCH] watchdog: make DesignWare watchdog allow users to set bigger timeout value

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Message-ID: <d31883d3-7f5b-545c-cc64-beb3848dbe7d@roeck-us.net>
Date:   Thu, 21 Nov 2019 01:56:00 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Wang, Peng 1. (NSB - CN/Hangzhou)" <peng.1.wang@...ia-sbell.com>,
        Guenter Roeck <groeck7@...il.com>
Cc:     "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] watchdog: make DesignWare watchdog allow users to set
 bigger timeout value

On 11/21/19 12:21 AM, Wang, Peng 1. (NSB - CN/Hangzhou) wrote:
>>>From d21d084122d08816454a1e338f0946a9da1f81e3 Mon Sep 17 00:00:00 2001
> From: Peng Wang <peng.1.wang@...ia-sbell.com>
> Date: Wed, 20 Nov 2019 15:12:59 +0800
> Subject: [PATCH] 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@...ia-sbell.com>
> ---

Please version your patches, and add a change log here.

>   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..f1a431c 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->timeout

No, 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;
>   }
>