path: root/drivers/devfreq/devfreq.c
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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-10-27 10:10:16 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-06 13:57:47 +0100
commit05087360fd7acf2cc9b7bbb243c12765c44c7693 (patch)
tree51d845be56e5384a1d55344a7f1b97002ffeeafa /drivers/devfreq/devfreq.c
parentc4b65157aeefad29b2351a00a010e8c40ce7fd0e (diff)
ACPI / PM: Take SMART_SUSPEND driver flag into account
Make the ACPI PM domain take DPM_FLAG_SMART_SUSPEND into account in its system suspend callbacks. [Note that the pm_runtime_suspended() check in acpi_dev_needs_resume() is an optimization, because if is not passed, all of the subsequent checks may be skipped and some of them are much more overhead in general.] Also use the observation that if the device is in runtime suspend at the beginning of the "late" phase of a system-wide suspend-like transition, its state cannot change going forward (runtime PM is disabled for it at that time) until the transition is over and the subsequent system-wide PM callbacks should be skipped for it (as they generally assume the device to not be suspended), so add checks for that in acpi_subsys_suspend_late/noirq() and acpi_subsys_freeze_late/noirq(). Moreover, if acpi_subsys_resume_noirq() is called during the subsequent system-wide resume transition and if the device was left in runtime suspend previously, its runtime PM status needs to be changed to "active" as it is going to be put into the full-power state going forward, so add a check for that too in there. In turn, if acpi_subsys_thaw_noirq() runs after the device has been left in runtime suspend, the subsequent "thaw" callbacks need to be skipped for it (as they may not work correctly with a suspended device), so set the power.direct_complete flag for the device then to make the PM core skip those callbacks. On top of the above, make the analogous changes in the acpi_lpss driver that uses the ACPI PM domain callbacks. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/devfreq/devfreq.c')
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