[PATCH] drivers: core: Detach device from power domain on shutdown

[PATCH] drivers: core: Detach device from power domain on shutdown

[Furquan Shaikh]

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@google.com>
---
 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);
-- 
2.29.2.454.gaff20da3a2-goog

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Furquan Shaikh]

On Tue, Dec 1, 2020 at 1:30 PM Furquan Shaikh <furquan@google.com> wrote:
>
> 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@google.com>
> ---
>  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);
> --
> 2.29.2.454.gaff20da3a2-goog
>

Hello,

Gentle ping. Just checking if there are any comments.

Thanks,
Furquan

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Greg Kroah-Hartman]

On Mon, Dec 14, 2020 at 08:56:48PM -0800, Furquan Shaikh wrote:
> On Tue, Dec 1, 2020 at 1:30 PM Furquan Shaikh <furquan@google.com> wrote:
> >
> > 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@google.com>
> > ---
> >  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);
> > --
> > 2.29.2.454.gaff20da3a2-goog
> >
> 
> Hello,
> 
> Gentle ping. Just checking if there are any comments.

I'll wait for Rafael to ack this before taking it...

thanks,

greg k-h

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Rafael J. Wysocki]

On Tue, Dec 1, 2020 at 10:30 PM Furquan Shaikh <furquan@google.com> wrote:
>
> 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@google.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
>  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);
> --
> 2.29.2.454.gaff20da3a2-goog
>

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Rafael J. Wysocki]

On Fri, Jan 8, 2021 at 4:43 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Mon, Dec 14, 2020 at 08:56:48PM -0800, Furquan Shaikh wrote:
> > On Tue, Dec 1, 2020 at 1:30 PM Furquan Shaikh <furquan@google.com> wrote:
> > >
> > > 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@google.com>
> > > ---
> > >  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);
> > > --
> > > 2.29.2.454.gaff20da3a2-goog
> > >
> >
> > Hello,
> >
> > Gentle ping. Just checking if there are any comments.
>
> I'll wait for Rafael to ack this before taking it...

Done.

Cheers!

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Dmitry Osipenko]

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@google.com>
> ---
>  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.

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Rafael J. Wysocki]

On Tue, Jan 12, 2021 at 10:55 AM Dmitry Osipenko <digetx@gmail.com> 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@google.com>
> > ---
> >  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.

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Greg Kroah-Hartman]

On Tue, Jan 12, 2021 at 01:45:25PM +0100, Rafael J. Wysocki wrote:
> On Tue, Jan 12, 2021 at 10:55 AM Dmitry Osipenko <digetx@gmail.com> 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@google.com>
> > > ---
> > >  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.

Now reverted, thanks.

greg k-h

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Furquan Shaikh]

On Tue, Jan 12, 2021 at 5:09 AM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Tue, Jan 12, 2021 at 01:45:25PM +0100, Rafael J. Wysocki wrote:
> > On Tue, Jan 12, 2021 at 10:55 AM Dmitry Osipenko <digetx@gmail.com> 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@google.com>
> > > > ---
> > > >  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.

Sorry about the breakage. I am working on an alternate solution that
Rafael suggested.

> >
> > OK, so Greg please drop it.
>
> Now reverted, thanks.

Thanks Greg!

>
> greg k-h

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Dmitry Osipenko]

13.01.2021 04:22, Furquan Shaikh пишет:
> On Tue, Jan 12, 2021 at 5:09 AM Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
>>
>> On Tue, Jan 12, 2021 at 01:45:25PM +0100, Rafael J. Wysocki wrote:
>>> On Tue, Jan 12, 2021 at 10:55 AM Dmitry Osipenko <digetx@gmail.com> 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@google.com>
>>>>> ---
>>>>>  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.
> 
> Sorry about the breakage. I am working on an alternate solution that
> Rafael suggested.
> 
>>>
>>> OK, so Greg please drop it.
>>
>> Now reverted, thanks.
> 
> Thanks Greg!

Thank you all for addressing this problem!

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Kai-Heng Feng]

Hi Furquan,

On Wed, Jan 13, 2021 at 10:31 PM Dmitry Osipenko <digetx@gmail.com> wrote:
[snipped]
> Thank you all for addressing this problem!

Are you still working on the alternate solution? This patch can
address S5 power consumption issue for some laptops:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1912935

Kai-Heng

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Furquan Shaikh]

On Wed, Feb 3, 2021 at 6:37 PM Kai-Heng Feng
<kai.heng.feng@canonical.com> wrote:
>
> Hi Furquan,
>
> On Wed, Jan 13, 2021 at 10:31 PM Dmitry Osipenko <digetx@gmail.com> wrote:
> [snipped]
> > Thank you all for addressing this problem!
>
> Are you still working on the alternate solution?

Yes, it is in my pipeline, but I have been distracted because of some
other high priority tasks. I plan to push something for review in ~3-4
weeks.

> This patch can
> address S5 power consumption issue for some laptops:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1912935
>
> Kai-Heng

Re: [PATCH] drivers: core: Detach device from power domain on shutdown

[Kai-Heng Feng]

On Thu, Feb 4, 2021 at 12:09 PM Furquan Shaikh <furquan@google.com> wrote:
>
> On Wed, Feb 3, 2021 at 6:37 PM Kai-Heng Feng
> <kai.heng.feng@canonical.com> wrote:
> >
> > Hi Furquan,
> >
> > On Wed, Jan 13, 2021 at 10:31 PM Dmitry Osipenko <digetx@gmail.com> wrote:
> > [snipped]
> > > Thank you all for addressing this problem!
> >
> > Are you still working on the alternate solution?
>
> Yes, it is in my pipeline, but I have been distracted because of some
> other high priority tasks. I plan to push something for review in ~3-4
> weeks.

Please Cc me in the revised patch.
Thanks for your work.

Kai-Heng

>
> > This patch can
> > address S5 power consumption issue for some laptops:
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1912935
> >
> > Kai-Heng