Parameters struct drm_i915_private * dev_priv i915 device instance uint32_t state target DC power state Void gen9_set_dc_state (struct drm_i915_private * dev_priv, uint32_t state ) ¶ Threads can’t disable the power well while the caller tries to read a few Upon explicit power domain reference counting to ensure that the hardwareĬallers must hold the relevant modesetting locks to ensure that concurrent Used in hardware state readout functions. This function can be used to check the hw power domain state. True when the power domain is enabled, false otherwise.īool intel_display_power_is_enabled (struct drm_i915_private * dev_priv, enum intel_display_power_domain domain ) ¶ Only be used from error capture and recovery code where deadlocks are This is the unlocked version of intel_display_power_is_enabled() and should Parameters struct drm_i915_private * dev_priv i915 device instance enum intel_display_power_domain domain power domain to check It then maps those to the actual power wellsīool _intel_display_power_is_enabled (struct drm_i915_private * dev_priv, enum intel_display_power_domain domain ) ¶ Generic functions to the driver for grabbing and releasing references forĪbstract power domains.

Hardware engineers just love to shuffle functionality around between powerĭomains there’s a sizeable amount of indirection required. Since i915 supports a diverse set of platforms with a unified codebase and Since on the GT side a lot of the power management is done by the hardware.īut even there some manual control at the device level is required.

Software is supposed to control many power gates manually on recent hardware, This is especially important on the display side where

The i915 driver supports dynamic enabling and disabling of entire hardwareīlocks at runtime.

Linux intel graphics driver