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

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Date:   Thu, 21 Nov 2019 18:41:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Wang, Peng 1. (NSB - CN/Hangzhou)" <peng.1.wang@...ia-sbell.com>
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

On 11/21/19 5:16 PM, Wang, Peng 1. (NSB - CN/Hangzhou) wrote:
>> 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?
> 

No, that won't be necessary.

Guenter

> 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
>>
>