linux-kernel - Re: [PATCH V2 2/2] watchdog: f71808e

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Message-ID: <20190327173239.GC9951@roeck-us.net>
Date:   Wed, 27 Mar 2019 10:32:39 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Ji-Ze Hong (Peter Hong)" <hpeter@...il.com>
Cc:     peter_hong@...tek.com.tw, wim@...ux-watchdog.org,
        linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Ji-Ze Hong (Peter Hong)" <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH V2 2/2] watchdog: f71808e_wdt: fix F81866 bit operation

On Wed, Mar 27, 2019 at 02:42:51PM +0800, Ji-Ze Hong (Peter Hong) wrote:
> Fix error bit operation in watchdog_start()
> 
> Fixes: 14b24a88a3660 ("watchdog: f71808e_wdt: Add F81866 support")
> Signed-off-by: Ji-Ze Hong (Peter Hong) <hpeter+linux_kernel@...il.com>

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

> ---
>  drivers/watchdog/f71808e_wdt.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
> index bd2ced9f39f4..afd1446241b3 100644
> --- a/drivers/watchdog/f71808e_wdt.c
> +++ b/drivers/watchdog/f71808e_wdt.c
> @@ -339,6 +339,7 @@ static int f71862fg_pin_configure(unsigned short ioaddr)
>  static int watchdog_start(void)
>  {
>  	int err;
> +	u8 tmp;
>  
>  	/* Make sure we don't die as soon as the watchdog is enabled below */
>  	err = watchdog_keepalive();
> @@ -388,19 +389,18 @@ static int watchdog_start(void)
>  		break;
>  
>  	case f81866:
> -		/* Set pin 70 to WDTRST# */
> -		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
> -				  BIT(3) | BIT(0));
> -		superio_set_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
> -				BIT(2));
>  		/*
>  		 * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.
>  		 * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:
>  		 *     BIT5: 0 -> WDTRST#
>  		 *           1 -> GPIO15
>  		 */
> -		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1,
> -				  BIT(5));
> +		tmp = superio_inb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL);
> +		tmp &= ~(BIT(3) | BIT(0));
> +		tmp |= BIT(2);
> +		superio_outb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL, tmp);
> +
> +		superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1, 5);
>  		break;
>  
>  	default:
> -- 
> 2.7.4
>