On Tue, Jan 12, 2021 at 10:55 AM Dmitry Osipenko <digetx@xxxxxxxxx> wrote: > > 02.12.2020 00:30, Furquan Shaikh пишет: > > When the system is powered off or rebooted, devices are not detached > > from their PM domain. This results in ACPI PM not being invoked and > > hence PowerResouce _OFF method not being invoked for any of the > > devices. Because the ACPI power resources are not turned off in case > > of poweroff and reboot, it violates the power sequencing requirements > > which impacts the reliability of the devices over the lifetime of the > > platform. This is currently observed on all Chromebooks using ACPI. > > > > In order to solve the above problem, this change detaches a device > > from its PM domain whenever it is shutdown. This action is basically > > analogous to ->remove() from driver model perspective. Detaching the > > device from its PM domain ensures that the ACPI PM gets a chance to > > turn off the power resources for the device thus complying with its > > power sequencing requirements. > > > > Signed-off-by: Furquan Shaikh <furquan@xxxxxxxxxx> > > --- > > drivers/base/core.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/drivers/base/core.c b/drivers/base/core.c > > index d661ada1518f..5823f1d719e1 100644 > > --- a/drivers/base/core.c > > +++ b/drivers/base/core.c > > @@ -23,6 +23,7 @@ > > #include <linux/of_device.h> > > #include <linux/genhd.h> > > #include <linux/mutex.h> > > +#include <linux/pm_domain.h> > > #include <linux/pm_runtime.h> > > #include <linux/netdevice.h> > > #include <linux/sched/signal.h> > > @@ -4057,6 +4058,8 @@ void device_shutdown(void) > > dev->driver->shutdown(dev); > > } > > > > + dev_pm_domain_detach(dev, true); > > + > > device_unlock(dev); > > if (parent) > > device_unlock(parent); > > > > This patch broke system shutdown on NVIDIA Tegra using today's > linux-next because power domain can't be turned off until device drivers > handed control over device resets to the power domain of Power > Management controller on Tegra. This patch introduced the wrong > behaviour, apparently it should be made specific to ACPI only. > > Please fix, thanks in advance. OK, so Greg please drop it.
