intel_runtime_pm_get_noresume — grab a runtime pm reference
void intel_runtime_pm_get_noresume ( | struct drm_i915_private * dev_priv); |
This function grabs a device-level runtime pm reference (mostly used for GEM code to ensure the GTT or GT is on).
It will _not_ power up the device but instead only check that it's powered on. Therefore it is only valid to call this functions from contexts where the device is known to be powered up and where trying to power it up would result in hilarity and deadlocks. That pretty much means only the system suspend/resume code where this is used to grab runtime pm references for delayed setup down in work items.
Any runtime pm reference obtained by this function must have a symmetric
call to intel_runtime_pm_put to release the reference again.