Rafael J. Wysocki c24efa6732 PM: runtime: Capture device status before disabling runtime PM ... In some cases (for example, during system-wide suspend and resume of devices) it is useful to know whether or not runtime PM has ever been enabled for a given device and, if so, what the runtime PM status of it had been right before runtime PM was disabled for it last time. For this reason, introduce a new struct dev_pm_info field called last_status that will be used for capturing the runtime PM status of the device when its power.disable_depth counter changes from 0 to 1. The new field will be set to RPM_INVALID to start with and whenever power.disable_depth changes from 1 to 0, so it will be valid only when runtime PM of the device is currently disabled, but it has been enabled at least once. Immediately use power.last_status in rpm_resume() to make it handle the case when PM runtime is disabled for the device, but its runtime PM status is RPM_ACTIVE more consistently. Namely, make it return 1 if power.last_status is also equal to RPM_ACTIVE in that case (the idea being that if the status was RPM_ACTIVE last time when power.disable_depth was changing from 0 to 1 and it is still RPM_ACTIVE, it can be assumed to reflect what happened to the device last time when it was using runtime PM) and -EACCES otherwise. Update the documentation to provide a description of last_status and change the description of pm_runtime_resume() in it to reflect the new behavior of rpm_active(). While at it, rearrange the code in pm_runtime_enable() to be more straightforward and replace the WARN() macro in it with a pr_warn() invocation which is less disruptive. Link: https://lore.kernel.org/linux-pm/20211026222626.39222-1-ulf.hansson@linaro.org/t/#u Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2021-12-17 16:16:40 +01:00
..
powercap	Documentation/powercap/dtpm: Add documentation for dtpm	2020-12-22 19:50:40 +01:00
regulator	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
apm-acpi.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
basic-pm-debugging.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
charger-manager.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
drivers-testing.rst	PM: Wrap documentation to fit in 80 columns	2019-11-20 12:16:37 +01:00
energy-model.rst	Documentation: power: Describe 'advanced' and 'simple' EM models	2021-11-10 21:26:34 +01:00
freezing-of-tasks.rst	Documentation: Replace lkml.org links with lore	2021-01-11 12:47:38 -07:00
index.rst	Documentation/powercap/dtpm: Add documentation for dtpm	2020-12-22 19:50:40 +01:00
opp.rst	PM: Wrap documentation to fit in 80 columns	2019-11-20 12:16:37 +01:00
pci.rst	PCI/PM: Rename pci_dev.d3_delay to d3hot_delay	2020-09-29 14:21:50 -05:00
pm_qos_interface.rst	Documentation: power: fix pm_qos_interface.rst format warning	2020-02-20 11:53:32 +01:00
power_supply_class.rst	dt-bindings: power: update battery.yaml reference	2021-04-02 13:00:55 +02:00
runtime_pm.rst	PM: runtime: Capture device status before disabling runtime PM	2021-12-17 16:16:40 +01:00
s2ram.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
suspend-and-cpuhotplug.rst	cpu/hotplug: Remove disable_nonboot_cpus()	2020-05-07 15:18:40 +02:00
suspend-and-interrupts.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
swsusp-and-swap-files.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
swsusp-dmcrypt.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
swsusp.rst	PM: Wrap documentation to fit in 80 columns	2019-11-20 12:16:37 +01:00
tricks.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00
userland-swsusp.rst	PM: hibernate: fix docs for ioctls that return loff_t via pointer	2020-03-14 11:51:32 +01:00
video.rst	docs: power: convert docs to ReST and rename to *.rst	2019-06-14 16:08:36 -05:00