linux-kernel - Re: [PATCH V3 2/2] watchdog: imx7ulp: Watchdog should continue running for wait/stop mode

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Date:   Thu, 30 Jul 2020 09:53:17 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Anson Huang <Anson.Huang@....com>
Cc:     wim@...ux-watchdog.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Linux-imx@....com
Subject: Re: [PATCH V3 2/2] watchdog: imx7ulp: Watchdog should continue
 running for wait/stop mode

On Thu, Jul 30, 2020 at 10:03:11AM +0800, Anson Huang wrote:
> When kernel idle, system will enter wait/stop mode, wdog should continue
> running in this scenario, and the refresh thread can wake up system from
> wait/stop mode.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>

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

> ---
> no change.
> ---
>  drivers/watchdog/imx7ulp_wdt.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
> index 010ddd1..77773b0 100644
> --- a/drivers/watchdog/imx7ulp_wdt.c
> +++ b/drivers/watchdog/imx7ulp_wdt.c
> @@ -22,6 +22,8 @@
>  #define WDOG_CS_CLK		(LPO_CLK << LPO_CLK_SHIFT)
>  #define WDOG_CS_EN		BIT(7)
>  #define WDOG_CS_UPDATE		BIT(5)
> +#define WDOG_CS_WAIT		BIT(1)
> +#define WDOG_CS_STOP		BIT(0)
>  
>  #define WDOG_CNT	0x4
>  #define WDOG_TOVAL	0x8
> @@ -187,7 +189,8 @@ static int imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
>  	/* set an initial timeout value in TOVAL */
>  	writel(timeout, base + WDOG_TOVAL);
>  	/* enable 32bit command sequence and reconfigure */
> -	val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE;
> +	val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE |
> +	      WDOG_CS_WAIT | WDOG_CS_STOP;
>  	writel(val, base + WDOG_CS);
>  	imx7ulp_wdt_wait(base, WDOG_CS_RCS);
>  
> -- 
> 2.7.4
>