linux-kernel - Re: [PATCH 2/2] watchdog: orion_wdt: support pretimeout on Armada-XP

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Date:   Mon, 14 Feb 2022 07:57:13 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     andrew@...n.ch, gregory.clement@...tlin.com, robh+dt@...nel.org,
        wim@...ux-watchdog.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 2/2] watchdog: orion_wdt: support pretimeout on Armada-XP

On Fri, Feb 11, 2022 at 01:32:57PM +1300, Chris Packham wrote:
> Commit e07a4c79ca75 ("watchdog: orion_wdt: use timer1 as a pretimeout")
> added support for a pretimeout on Armada-38x variants. Because the
> Armada-XP variants use armada370_start/armada370_stop (due to missing an
> explicit RSTOUT mask bit for the watchdog). Add the required pretimeout
> support to armada370_start/armada370_stop for Armada-XP.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> Reviewed-by: Gregory CLEMENT <gregory.clement@...tlin.com>

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

> ---
>  drivers/watchdog/orion_wdt.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
> index 127eefc9161d..e25e6bf4647f 100644
> --- a/drivers/watchdog/orion_wdt.c
> +++ b/drivers/watchdog/orion_wdt.c
> @@ -238,8 +238,10 @@ static int armada370_start(struct watchdog_device *wdt_dev)
>  	atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
>  
>  	/* Enable watchdog timer */
> -	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
> -						dev->data->wdt_enable_bit);
> +	reg = dev->data->wdt_enable_bit;
> +	if (dev->wdt.info->options & WDIOF_PRETIMEOUT)
> +		reg |= TIMER1_ENABLE_BIT;
> +	atomic_io_modify(dev->reg + TIMER_CTRL, reg, reg);
>  
>  	/* Enable reset on watchdog */
>  	reg = readl(dev->rstout);
> @@ -312,7 +314,7 @@ static int armada375_stop(struct watchdog_device *wdt_dev)
>  static int armada370_stop(struct watchdog_device *wdt_dev)
>  {
>  	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
> -	u32 reg;
> +	u32 reg, mask;
>  
>  	/* Disable reset on watchdog */
>  	reg = readl(dev->rstout);
> @@ -320,7 +322,10 @@ static int armada370_stop(struct watchdog_device *wdt_dev)
>  	writel(reg, dev->rstout);
>  
>  	/* Disable watchdog timer */
> -	atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
> +	mask = dev->data->wdt_enable_bit;
> +	if (wdt_dev->info->options & WDIOF_PRETIMEOUT)
> +		mask |= TIMER1_ENABLE_BIT;
> +	atomic_io_modify(dev->reg + TIMER_CTRL, mask, 0);
>  
>  	return 0;
>  }