On Wed, Aug 21, 2019 at 7:54 PM Alejandro González
<[email protected]> wrote:
>
> This change exposes the needed interfaces to configure wake alarms to
> userspace, but it doesn't let a SoC resume from a wakealarm by itself
> (that depends on how interrupts are handled). However, it is still
> useful for generating interrupts, it allows users to test the wakealarm
> setting codepath of the sun6i RTC driver, and it will allow developers
> to test wakeup from suspend more easily.
>
> I've tested this on a Pine H64 model B, which contains an Allwinner H6
> SoC, with the help of the test_suspend kernel parameter. I got these
> results:
>
> [ 1.092823] PM: test RTC wakeup from 'freeze' suspend
> [ 1.098391] PM: suspend entry (s2idle)
> [ 1.102543] Filesystems sync: 0.000 seconds
> [ 1.107333] Freezing user space processes ... (elapsed 0.000 seconds) done.
> [ 1.115061] OOM killer disabled.
> [ 1.118621] Freezing remaining freezable tasks ... (elapsed 0.002 seconds)
> done.
> [ 1.204986] PM: suspend devices took 0.076 seconds
> ** The kernel doesn't resume from freeze until reset. **
>
> [ 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
>
> $ 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 <[email protected]>
You need to send to this to the actual maintainers and mailing lists,
not linux-sunxi.
Use scripts/get_maintainers.pl to get a list of relevant parties.
> ---
> drivers/rtc/rtc-sun6i.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
> index c0e75c373605..1ecca0ae3f68 100644
> --- a/drivers/rtc/rtc-sun6i.c
> +++ b/drivers/rtc/rtc-sun6i.c
> @@ -650,6 +650,12 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
>
> clk_prepare_enable(chip->losc);
>
> + /*
> + * Init as wakeup source. This alone won't let resume
> + * from suspend work, but still generates an interrupt.
> + */
> + 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)) {
> --
> 2.20.1
>
> --
> You received this message because you are subscribed to the Google Groups
> "linux-sunxi" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> To view this discussion on the web, visit
> https://groups.google.com/d/msgid/linux-sunxi/b5086f94-2e73-483a-ba03-bd81f7cd175f%40googlegroups.com.
--
You received this message because you are subscribed to the Google Groups
"linux-sunxi" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web, visit
https://groups.google.com/d/msgid/linux-sunxi/CAGb2v67SHjE3k0oVM%3DysJqFiZER-sikCMeEcse_%2BtA_Rztcfew%40mail.gmail.com.
