intel_display_power_is_enabled — check for a power domain
bool intel_display_power_is_enabled ( | struct drm_i915_private * dev_priv, |
enum intel_display_power_domain domain); |
This function can be used to check the hw power domain state. It is mostly used in hardware state readout functions. Everywhere else code should rely upon explicit power domain reference counting to ensure that the hardware block is powered up before accessing it.
Callers must hold the relevant modesetting locks to ensure that concurrent threads can't disable the power well while the caller tries to read a few registers.