From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linux PM <linux-pm@vger.kernel.org>,
Lukas Wunner <lukas@wunner.de>,
Bjorn Helgaas <bhelgaas@google.com>,
Alan Stern <stern@rowland.harvard.edu>,
LKML <linux-kernel@vger.kernel.org>,
Linux ACPI <linux-acpi@vger.kernel.org>,
Linux PCI <linux-pci@vger.kernel.org>,
Linux Documentation <linux-doc@vger.kernel.org>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
Ulf Hansson <ulf.hansson@linaro.org>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Kevin Hilman <khilman@kernel.org>,
Wolfram Sang <wsa@the-dreams.de>,
linux-i2c@vger.kernel.org, Lee Jones <lee.jones@linaro.org>
Subject: Re: [Update][PATCH v2 01/12] PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags
Date: Fri, 20 Oct 2017 13:28:33 +0200 [thread overview]
Message-ID: <9928366.cAI691llHG@aspire.rjw.lan> (raw)
In-Reply-To: <20171020113527.GA699@kroah.com>
On Friday, October 20, 2017 1:35:27 PM CEST Greg Kroah-Hartman wrote:
> On Fri, Oct 20, 2017 at 01:11:22PM +0200, Rafael J. Wysocki wrote:
> > On Thursday, October 19, 2017 9:33:15 AM CEST Greg Kroah-Hartman wrote:
> > > On Thu, Oct 19, 2017 at 01:17:31AM +0200, Rafael J. Wysocki wrote:
> > > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > > >
> > > > The motivation for this change is to provide a way to work around
> > > > a problem with the direct-complete mechanism used for avoiding
> > > > system suspend/resume handling for devices in runtime suspend.
> > > >
> > > > The problem is that some middle layer code (the PCI bus type and
> > > > the ACPI PM domain in particular) returns positive values from its
> > > > system suspend ->prepare callbacks regardless of whether the driver's
> > > > ->prepare returns a positive value or 0, which effectively prevents
> > > > drivers from being able to control the direct-complete feature.
> > > > Some drivers need that control, however, and the PCI bus type has
> > > > grown its own flag to deal with this issue, but since it is not
> > > > limited to PCI, it is better to address it by adding driver flags at
> > > > the core level.
> > > >
> > > > To that end, add a driver_flags field to struct dev_pm_info for flags
> > > > that can be set by device drivers at the probe time to inform the PM
> > > > core and/or bus types, PM domains and so on on the capabilities and/or
> > > > preferences of device drivers. Also add two static inline helpers
> > > > for setting that field and testing it against a given set of flags
> > > > and make the driver core clear it automatically on driver remove
> > > > and probe failures.
> > > >
> > > > Define and document two PM driver flags related to the direct-
> > > > complete feature: NEVER_SKIP and SMART_PREPARE that can be used,
> > > > respectively, to indicate to the PM core that the direct-complete
> > > > mechanism should never be used for the device and to inform the
> > > > middle layer code (bus types, PM domains etc) that it can only
> > > > request the PM core to use the direct-complete mechanism for
> > > > the device (by returning a positive value from its ->prepare
> > > > callback) if it also has been requested by the driver.
> > > >
> > > > While at it, make the core check pm_runtime_suspended() when
> > > > setting power.direct_complete so that it doesn't need to be
> > > > checked by ->prepare callbacks.
> > > >
> > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > >
> > > Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> >
> > Thanks!
> >
> > Does it also apply to the other patches in the series?
> >
> > I'd like to queue up the core patches for 4.15 as they are specifically
> > designed to only affect the drivers that actually set the flags, so there
> > shouldn't be any regression resulting from them, and I'd like to be
> > able to start using the flags in drivers going forward.
>
> Yes, sorry, I thought I acked them, but you are right, I didn't:
>
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>
> for all of them please.
Thanks!
next prev parent reply other threads:[~2017-10-20 11:38 UTC|newest]
Thread overview: 135+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-16 1:12 [PATCH 0/12] PM / sleep: Driver flags for system suspend/resume Rafael J. Wysocki
2017-10-16 1:29 ` [PATCH 01/12] PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags Rafael J. Wysocki
2017-10-16 5:34 ` Lukas Wunner
2017-10-16 22:03 ` Rafael J. Wysocki
2017-10-16 6:28 ` Greg Kroah-Hartman
2017-10-16 22:05 ` Rafael J. Wysocki
2017-10-17 7:15 ` Greg Kroah-Hartman
2017-10-17 15:26 ` Rafael J. Wysocki
2017-10-18 6:56 ` Greg Kroah-Hartman
2017-10-16 6:31 ` Greg Kroah-Hartman
2017-10-16 22:07 ` Rafael J. Wysocki
2017-10-17 13:26 ` Greg Kroah-Hartman
2017-10-16 20:16 ` Alan Stern
2017-10-16 22:11 ` Rafael J. Wysocki
2017-10-18 23:17 ` [Update][PATCH v2 " Rafael J. Wysocki
2017-10-19 7:33 ` Greg Kroah-Hartman
2017-10-20 11:11 ` Rafael J. Wysocki
2017-10-20 11:35 ` Greg Kroah-Hartman
2017-10-20 11:28 ` Rafael J. Wysocki [this message]
2017-10-23 16:37 ` Ulf Hansson
2017-10-23 20:41 ` Rafael J. Wysocki
2017-10-16 1:29 ` [PATCH 02/12] PCI / PM: Use the NEVER_SKIP driver flag Rafael J. Wysocki
2017-10-23 16:40 ` Ulf Hansson
2017-10-16 1:29 ` [PATCH 03/12] PM: i2c-designware-platdrv: Use DPM_FLAG_SMART_PREPARE Rafael J. Wysocki
2017-10-23 16:57 ` Ulf Hansson
2017-10-16 1:29 ` [PATCH 04/12] PM / core: Add SMART_SUSPEND driver flag Rafael J. Wysocki
2017-10-23 19:01 ` Ulf Hansson
2017-10-24 5:22 ` Ulf Hansson
2017-10-24 8:55 ` Rafael J. Wysocki
2017-10-16 1:29 ` [PATCH 05/12] PCI / PM: Drop unnecessary invocations of pcibios_pm_ops callbacks Rafael J. Wysocki
2017-10-23 19:06 ` Ulf Hansson
2017-10-16 1:29 ` [PATCH 06/12] PCI / PM: Take SMART_SUSPEND driver flag into account Rafael J. Wysocki
2017-10-16 1:29 ` [PATCH 07/12] ACPI / LPSS: Consolidate runtime PM and system sleep handling Rafael J. Wysocki
2017-10-23 19:09 ` Ulf Hansson
2017-10-16 1:30 ` [PATCH 08/12] ACPI / PM: Take SMART_SUSPEND driver flag into account Rafael J. Wysocki
2017-10-16 1:30 ` [PATCH 09/12] PM / mfd: intel-lpss: Use DPM_FLAG_SMART_SUSPEND Rafael J. Wysocki
2017-10-31 15:09 ` Lee Jones
2017-10-31 16:28 ` Rafael J. Wysocki
2017-11-01 9:28 ` Lee Jones
2017-11-01 20:26 ` Rafael J. Wysocki
2017-11-08 11:08 ` Lee Jones
2017-10-16 1:30 ` [PATCH 10/12] PM / core: Add LEAVE_SUSPENDED driver flag Rafael J. Wysocki
2017-10-23 19:38 ` Ulf Hansson
2017-10-16 1:31 ` [PATCH 11/12] PM: i2c-designware-platdrv: Optimize power management Rafael J. Wysocki
2017-10-26 20:41 ` Wolfram Sang
2017-10-26 21:14 ` Rafael J. Wysocki
2017-10-16 1:32 ` [PATCH 12/12] PM / core: Add AVOID_RPM driver flag Rafael J. Wysocki
2017-10-17 15:33 ` Andy Shevchenko
2017-10-17 15:59 ` Rafael J. Wysocki
2017-10-17 16:25 ` Andy Shevchenko
2017-10-16 7:08 ` [PATCH 0/12] PM / sleep: Driver flags for system suspend/resume Greg Kroah-Hartman
2017-10-16 21:50 ` Rafael J. Wysocki
2017-10-17 8:36 ` Ulf Hansson
2017-10-17 15:25 ` Rafael J. Wysocki
2017-10-17 19:41 ` Ulf Hansson
2017-10-17 20:12 ` Alan Stern
2017-10-17 23:07 ` Rafael J. Wysocki
2017-10-18 0:39 ` Rafael J. Wysocki
2017-10-18 10:24 ` Rafael J. Wysocki
2017-10-18 12:34 ` Ulf Hansson
2017-10-18 21:54 ` Rafael J. Wysocki
2017-10-18 11:57 ` Ulf Hansson
2017-10-18 13:00 ` Rafael J. Wysocki
2017-10-18 14:11 ` Ulf Hansson
2017-10-18 19:45 ` Grygorii Strashko
2017-10-18 21:48 ` Rafael J. Wysocki
2017-10-19 8:33 ` Ulf Hansson
2017-10-19 17:21 ` Grygorii Strashko
2017-10-19 18:04 ` Ulf Hansson
2017-10-19 18:11 ` Ulf Hansson
2017-10-19 21:31 ` Grygorii Strashko
2017-10-20 6:05 ` Ulf Hansson
2017-10-18 22:12 ` Rafael J. Wysocki
2017-10-19 12:21 ` Ulf Hansson
2017-10-19 18:01 ` Ulf Hansson
2017-10-20 1:19 ` Rafael J. Wysocki
2017-10-20 5:57 ` Ulf Hansson
2017-10-20 20:46 ` Bjorn Helgaas
2017-10-21 1:04 ` Rafael J. Wysocki
2017-10-27 22:11 ` [PATCH v2 0/6] PM / sleep: Driver flags for system suspend/resume (part 1) Rafael J. Wysocki
2017-10-27 22:17 ` [PATCH v2 1/6] PM / core: Add NEVER_SKIP and SMART_PREPARE driver flags Rafael J. Wysocki
2017-11-06 8:07 ` Ulf Hansson
2017-10-27 22:19 ` [PATCH v2 2/6] PCI / PM: Use the NEVER_SKIP driver flag Rafael J. Wysocki
2017-10-27 22:22 ` [PATCH v2 3/6] PM / core: Add SMART_SUSPEND " Rafael J. Wysocki
2017-11-06 8:09 ` Ulf Hansson
2017-11-06 11:23 ` Rafael J. Wysocki
2017-10-27 22:23 ` [PATCH v2 4/6] PCI / PM: Drop unnecessary invocations of pcibios_pm_ops callbacks Rafael J. Wysocki
2017-10-27 22:27 ` [PATCH v2 5/6] PCI / PM: Take SMART_SUSPEND driver flag into account Rafael J. Wysocki
2017-10-31 22:48 ` Bjorn Helgaas
2017-10-27 22:30 ` [PATCH v2 6/6] ACPI " Rafael J. Wysocki
2017-11-08 0:41 ` [PATCH v2 0/6] PM / sleep: Driver flags for system suspend/resume (part 2) Rafael J. Wysocki
2017-11-08 13:25 ` [PATCH v2 1/6] PM / core: Add LEAVE_SUSPENDED driver flag Rafael J. Wysocki
2017-11-10 9:09 ` Ulf Hansson
2017-11-10 23:45 ` Rafael J. Wysocki
2017-11-11 0:41 ` Rafael J. Wysocki
2017-11-11 1:36 ` Rafael J. Wysocki
2017-11-14 16:07 ` Ulf Hansson
2017-11-15 1:48 ` Rafael J. Wysocki
2017-11-16 10:18 ` Ulf Hansson
2017-11-08 13:28 ` [PATCH v2 2/6] PCI / PM: Support for " Rafael J. Wysocki
2017-11-08 20:38 ` Bjorn Helgaas
2017-11-08 21:09 ` Rafael J. Wysocki
2017-11-08 13:34 ` [PATCH v2 3/6] ACPI / PM: Support for LEAVE_SUSPENDED driver flag in ACPI PM domain Rafael J. Wysocki
2017-11-08 13:37 ` [PATCH v2 4/6] PM / core: Add helpers for subsystem callback selection Rafael J. Wysocki
2017-11-08 13:38 ` [PATCH v2 5/6] PM / core: Direct handling of DPM_FLAG_LEAVE_SUSPENDED Rafael J. Wysocki
2017-11-08 13:39 ` [PATCH v2 6/6] PM / core: DPM_FLAG_SMART_SUSPEND optimization Rafael J. Wysocki
2017-11-12 0:34 ` [PATCH v3 0/6] PM / sleep: Driver flags for system suspend/resume (part 2) Rafael J. Wysocki
2017-11-12 0:37 ` [PATCH v3 1/6] PM / core: Add LEAVE_SUSPENDED driver flag Rafael J. Wysocki
2017-11-16 15:10 ` Ulf Hansson
2017-11-16 23:07 ` Rafael J. Wysocki
2017-11-17 6:11 ` Ulf Hansson
2017-11-17 13:18 ` Rafael J. Wysocki
2017-11-17 13:49 ` Ulf Hansson
2017-11-17 14:31 ` Rafael J. Wysocki
2017-11-17 15:57 ` Ulf Hansson
2017-11-17 12:45 ` Rafael J. Wysocki
2017-11-12 0:40 ` [PATCH v3 2/6] PCI / PM: Support for " Rafael J. Wysocki
2017-11-12 0:40 ` [PATCH v3 3/6] ACPI / PM: Support for LEAVE_SUSPENDED driver flag in ACPI PM domain Rafael J. Wysocki
2017-11-12 0:42 ` [PATCH v3 4/6] PM / core: Add helpers for subsystem callback selection Rafael J. Wysocki
2017-11-15 7:43 ` Ulf Hansson
2017-11-15 17:55 ` Rafael J. Wysocki
2017-11-12 0:43 ` [PATCH v3 5/6] PM / core: Direct handling of DPM_FLAG_LEAVE_SUSPENDED Rafael J. Wysocki
2017-11-12 0:44 ` [PATCH v3 6/6] PM / core: DPM_FLAG_SMART_SUSPEND optimization Rafael J. Wysocki
2017-11-18 14:27 ` [PATCH v4 0/6] PM / sleep: Driver flags for system suspend/resume (part 2) Rafael J. Wysocki
2017-11-18 14:31 ` [PATCH v4 1/6] PM / core: Add LEAVE_SUSPENDED driver flag Rafael J. Wysocki
2017-11-20 12:25 ` Ulf Hansson
2017-11-21 0:16 ` Rafael J. Wysocki
2017-11-18 14:33 ` [PATCH v4 2/6] PCI / PM: Support for " Rafael J. Wysocki
2017-11-18 14:35 ` [PATCH v4 3/6] ACPI / PM: Support for LEAVE_SUSPENDED driver flag in ACPI PM domain Rafael J. Wysocki
2017-11-18 14:37 ` [PATCH v4 4/6] PM / core: Add helpers for subsystem callback selection Rafael J. Wysocki
2017-11-18 14:41 ` [PATCH v4 5/6] PM / core: Direct handling of DPM_FLAG_LEAVE_SUSPENDED Rafael J. Wysocki
2017-11-20 13:42 ` Ulf Hansson
2017-11-22 1:10 ` Rafael J. Wysocki
2017-11-22 1:28 ` Rafael J. Wysocki
2017-11-18 14:44 ` [PATCH v4 6/6] PM / core: DPM_FLAG_SMART_SUSPEND optimization Rafael J. Wysocki
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