linux-kernel - RE: [PATCH v2] watchdog: make DesignWare watchdog allow users to set bigger timeout value

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Date:   Fri, 22 Nov 2019 01:16:34 +0000
From:   "Wang, Peng 1. (NSB - CN/Hangzhou)" <peng.1.wang@...ia-sbell.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     Guenter Roeck <groeck7@...il.com>,
        "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 v2] watchdog: make DesignWare watchdog allow users to set
 bigger timeout value

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

Roeck, thanks for your time to guide me to finish the review. Do I need to re-send a mail with your sign?

Peng Wang

-----Original Message-----
From: Guenter Roeck [mailto:groeck7@...il.com] On Behalf Of Guenter Roeck
Sent: Thursday, November 21, 2019 10:15 PM
To: Wang, Peng 1. (NSB - CN/Hangzhou) <peng.1.wang@...ia-sbell.com>
Cc: Guenter Roeck <groeck7@...il.com>; wim@...ux-watchdog.org; linux-watchdog@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] watchdog: make DesignWare watchdog allow users to set bigger timeout value

On Thu, Nov 21, 2019 at 10:35:12AM +0000, Wang, Peng 1. (NSB - CN/Hangzhou) wrote:
> From aabaa4b709bd451e566c906e8d1dca48f92f9b12 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.
> 
> ---
> 
> v2 -> v1:
>        - 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
> 
> Signed-off-by: Peng Wang <peng.1.wang@...ia-sbell.com>

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

> ---
>  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
>