linux-kernel - Re: [RESEND PATCH 1/1] rtc: sun6i: Allow using as wakeup source from suspend

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Date:   Sat, 24 Aug 2019 12:10:01 +0200
From:   Alejandro González 
        <alejandro.gonzalez.correo@...il.com>
To:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        maxime.ripard@...tlin.com, wens@...e.org,
        linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     linux-sunxi@...glegroups.com
Subject: Re: [RESEND PATCH 1/1] rtc: sun6i: Allow using as wakeup source from
 suspend


Alejandro González wrote:
> This patch allows userspace to set up wakeup alarms on any RTC handled by the
> sun6i driver, and adds the necessary PM operations to allow resuming from
> suspend when the configured wakeup alarm fires a IRQ. Of course, that the
> device actually resumes depends on the suspend state and how a particular
> hardware reacts to it, but that is out of scope for this patch.
> 
> I've tested these changes on a Pine H64 model B, which contains a
> Allwinner H6 SoC, with the help of CONFIG_PM_TEST_SUSPEND kernel option.
> These are the interesting outputs from the kernel and commands which
> show that it works. As every RTC handled by this driver is largely the
> same, I think that it shouldn't introduce any regression on other SoCs,
> but I may be wrong.
> 
> [    1.092705] PM: test RTC wakeup from 'freeze' suspend
> [    1.098230] PM: suspend entry (s2idle)
> [    1.212907] PM: suspend devices took 0.080 seconds
> (The SoC freezes for some seconds)
> [    3.197604] PM: resume devices took 0.104 seconds
> [    3.215937] PM: suspend exit
> 
> [    1.092812] PM: test RTC wakeup from 'mem' suspend
> [    1.098089] PM: suspend entry (deep)
> [    1.102033] PM: suspend exit
> [    1.105205] PM: suspend test failed, error -22
> 
> In any case, the RTC alarm interrupt gets fired as exptected:
> 
> $ echo +5 > /sys/class/rtc/rtc0/wakealarm && sleep 5 && grep rtc /proc/interrupts
>  29:          1          0          0          0     GICv2 133 Level     7000000.rtc
> 
> Signed-off-by: Alejandro González <alejandro.gonzalez.correo@...il.com>
> ---
>  drivers/rtc/rtc-sun6i.c | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
> index c0e75c373605..b7611e5dea3f 100644
> --- a/drivers/rtc/rtc-sun6i.c
> +++ b/drivers/rtc/rtc-sun6i.c
> @@ -598,6 +598,33 @@ static const struct rtc_class_ops sun6i_rtc_ops = {
>  	.alarm_irq_enable	= sun6i_rtc_alarm_irq_enable
>  };
>  
> +#ifdef CONFIG_PM_SLEEP
> +/* Enable IRQ wake on suspend, to wake up from RTC. */
> +static int sun6i_rtc_suspend(struct device *dev)
> +{
> +	struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
> +
> +	if (device_may_wakeup(dev))
> +		enable_irq_wake(chip->irq);
> +
> +	return 0;
> +}
> +
> +/* Disable IRQ wake on resume. */
> +static int sun6i_rtc_resume(struct device *dev)
> +{
> +	struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
> +
> +	if (device_may_wakeup(dev))
> +		disable_irq_wake(chip->irq);
> +
> +	return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(sun6i_rtc_pm_ops,
> +	sun6i_rtc_suspend, sun6i_rtc_resume);
> +
>  static int sun6i_rtc_probe(struct platform_device *pdev)
>  {
>  	struct sun6i_rtc_dev *chip = sun6i_rtc;
> @@ -650,6 +677,8 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
>  
>  	clk_prepare_enable(chip->losc);
>  
> +	device_init_wakeup(&pdev->dev, 1);
> +
>  	chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-sun6i",
>  					     &sun6i_rtc_ops, THIS_MODULE);
>  	if (IS_ERR(chip->rtc)) {
> @@ -684,6 +713,7 @@ static struct platform_driver sun6i_rtc_driver = {
>  	.driver		= {
>  		.name		= "sun6i-rtc",
>  		.of_match_table = sun6i_rtc_dt_ids,
> +		.pm = &sun6i_rtc_pm_ops,
>  	},
>  };
>  builtin_platform_driver(sun6i_rtc_driver);
> 
I'd be grateful if someone can test this patch on different boards to the Pine H64 model B. I'm afraid that board is the only one I have to test this.

Regards.