On 21/08/2019 23:00:56+0200, 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@xxxxxxxxx> > --- > drivers/rtc/rtc-sun6i.c | 30 ++++++++++++++++++++++++++++++ > 1 file changed, 30 insertions(+) > Applied, thanks. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
