linux-kernel - Re: [PATCH v2 2/2] watchdog: Add Realtek Otto watchdog timer

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Date:   Thu, 04 Nov 2021 10:21:50 +0100
From:   Sander Vanheule <sander@...nheule.net>
To:     linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] watchdog: Add Realtek Otto watchdog timer

On Thu, 2021-11-04 at 09:59 +0100, Sander Vanheule wrote:
> +       do {
> +               if (prescale > OTTO_WDT_PRESCALE_MAX)
> +                       return -EINVAL;
> +
> +               tick_ms = otto_wdt_tick_ms(ctrl, prescale);
> +               total_ticks = div_round_ticks(timeout_ms, tick_ms, 2);
> +               phase1_ticks = div_round_ticks(timeout_ms - pretimeout_ms, tick_ms,
> 1);
> +               phase2_ticks = total_ticks - phase1_ticks;
> +
> +               prescale++;
> +       } while (phase1_ticks > OTTO_WDT_PHASE_TICKS_MAX
> +               || phase2_ticks > OTTO_WDT_PHASE_TICKS_MAX);
> +
> +       v = ioread32(ctrl->base + OTTO_WDT_REG_CTRL);
> +
> +       v &= ~(OTTO_WDT_CTRL_PRESCALE | OTTO_WDT_CTRL_PHASE1 |
> OTTO_WDT_CTRL_PHASE2);
> +       v |= FIELD_PREP(OTTO_WDT_CTRL_PHASE1, phase1_ticks - 1);
> +       v |= FIELD_PREP(OTTO_WDT_CTRL_PHASE2, phase2_ticks - 1);
> +       v |= FIELD_PREP(OTTO_WDT_CTRL_PRESCALE, prescale);

I dropped the prescale_next variable here, but now the wrong prescale value is used
after the loop. I'll send out a v3 shortly.

Best,
Sander