linux-kernel - Re: [PATCH RESEND] watchdog: sama5d4: fix WDD value to be always set to max

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Date:   Tue, 9 Jul 2019 05:48:37 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eugen.Hristev@...rochip.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, wim@...ux-watchdog.org,
        linux-watchdog@...r.kernel.org
Cc:     Nicolas.Ferre@...rochip.com
Subject: Re: [PATCH RESEND] watchdog: sama5d4: fix WDD value to be always set
 to max

On 7/9/19 12:26 AM, Eugen.Hristev@...rochip.com wrote:
> From: Eugen Hristev <eugen.hristev@...rochip.com>
> 
> WDD value must be always set to max (0xFFF) otherwise the hardware
> block will reset the board on the first ping of the watchdog.
> 
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>

This patch is already in -next as of today.

Guenter

> ---
>   drivers/watchdog/sama5d4_wdt.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/watchdog/sama5d4_wdt.c b/drivers/watchdog/sama5d4_wdt.c
> index b8da1bf..5afe10c 100644
> --- a/drivers/watchdog/sama5d4_wdt.c
> +++ b/drivers/watchdog/sama5d4_wdt.c
> @@ -110,9 +110,7 @@ static int sama5d4_wdt_set_timeout(struct watchdog_device *wdd,
>   	u32 value = WDT_SEC2TICKS(timeout);
>   
>   	wdt->mr &= ~AT91_WDT_WDV;
> -	wdt->mr &= ~AT91_WDT_WDD;
>   	wdt->mr |= AT91_WDT_SET_WDV(value);
> -	wdt->mr |= AT91_WDT_SET_WDD(value);
>   
>   	/*
>   	 * WDDIS has to be 0 when updating WDD/WDV. The datasheet states: When
> @@ -248,7 +246,7 @@ static int sama5d4_wdt_probe(struct platform_device *pdev)
>   
>   	timeout = WDT_SEC2TICKS(wdd->timeout);
>   
> -	wdt->mr |= AT91_WDT_SET_WDD(timeout);
> +	wdt->mr |= AT91_WDT_SET_WDD(WDT_SEC2TICKS(MAX_WDT_TIMEOUT));
>   	wdt->mr |= AT91_WDT_SET_WDV(timeout);
>   
>   	ret = sama5d4_wdt_init(wdt);
>