linux-kernel - Re: [PATCH 2/7] watchdog/sbsa: Use arch_timer_read_counter instead of arch_counter_get

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Date:   Mon, 8 Apr 2019 11:07:51 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Russell King <linux@....linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: [PATCH 2/7] watchdog/sbsa: Use arch_timer_read_counter instead
 of arch_counter_get_cntvct

On Mon, Apr 08, 2019 at 04:49:02PM +0100, Marc Zyngier wrote:
> Only arch_timer_read_counter will guarantee that workarounds are
> applied. So let's use this one instead of arch_counter_get_cntvct.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

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

... assuming/hoping that those counters are actually the same.

Guenter

> ---
>  drivers/watchdog/sbsa_gwdt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/sbsa_gwdt.c b/drivers/watchdog/sbsa_gwdt.c
> index e8bd9887c566..e221e47396ab 100644
> --- a/drivers/watchdog/sbsa_gwdt.c
> +++ b/drivers/watchdog/sbsa_gwdt.c
> @@ -161,7 +161,7 @@ static unsigned int sbsa_gwdt_get_timeleft(struct watchdog_device *wdd)
>  		timeleft += readl(gwdt->control_base + SBSA_GWDT_WOR);
>  
>  	timeleft += lo_hi_readq(gwdt->control_base + SBSA_GWDT_WCV) -
> -		    arch_counter_get_cntvct();
> +		    arch_timer_read_counter();
>  
>  	do_div(timeleft, gwdt->clk);
>  
> -- 
> 2.20.1
>