linux-kernel - Re: [PATCH] rtc: pl031: fix set_alarm by adding back call to alarm_irq

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Date:   Tue, 14 Jul 2020 16:04:08 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH] rtc: pl031: fix set_alarm by adding back call to alarm_irq_enable


On 14/07/20 13:45, Sudeep Holla wrote:
> Commit c8ff5841a90b ("rtc: pl031: switch to rtc_time64_to_tm/rtc_tm_to_time64")
> seemed to have accidentally removed the call to pl031_alarm_irq_enable
> from pl031_set_alarm while switching to 64-bit apis.
>
> Let us add back the same to get the set alarm functionality back.
>
> Fixes: c8ff5841a90b ("rtc: pl031: switch to rtc_time64_to_tm/rtc_tm_to_time64")
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

Thanks for looking into this!

CONFIG_TEST_SUSPEND with test_suspend=mem now behaves correctly (i.e. comes
back out of suspend), and

  $ rtcwake -d /dev/rtc0 -s 2 -m no

shows an increase in RTC interrupts (which remains at 0 before this patch).

Tested-by: Valentin Schneider <valentin.schneider@....com>

> ---
>  drivers/rtc/rtc-pl031.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
> index 40d7450a1ce4..c6b89273feba 100644
> --- a/drivers/rtc/rtc-pl031.c
> +++ b/drivers/rtc/rtc-pl031.c
> @@ -275,6 +275,7 @@ static int pl031_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
>       struct pl031_local *ldata = dev_get_drvdata(dev);
>
>       writel(rtc_tm_to_time64(&alarm->time), ldata->base + RTC_MR);
> +	pl031_alarm_irq_enable(dev, alarm->enabled);
>
>       return 0;
>  }