drm/amdgpu/pm: document power_dpm_state (ca8d40ca) · Commits · 戴 / test

drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

+31 −0

Original line number	Diff line number	Diff line
		@@ -77,6 +77,37 @@ void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev)
		}
		}

		/**
		* DOC: power_dpm_state
		*
		* This is a legacy interface and is only provided for backwards compatibility.
		* The amdgpu driver provides a sysfs API for adjusting certain power
		* related parameters. The file power_dpm_state is used for this.
		* It accepts the following arguments:
		* - battery
		* - balanced
		* - performance
		*
		* battery
		*
		* On older GPUs, the vbios provided a special power state for battery
		* operation. Selecting battery switched to this state. This is no
		* longer provided on newer GPUs so the option does nothing in that case.
		*
		* balanced
		*
		* On older GPUs, the vbios provided a special power state for balanced
		* operation. Selecting balanced switched to this state. This is no
		* longer provided on newer GPUs so the option does nothing in that case.
		*
		* performance
		*
		* On older GPUs, the vbios provided a special power state for performance
		* operation. Selecting performance switched to this state. This is no
		* longer provided on newer GPUs so the option does nothing in that case.
		*
		*/

		static ssize_t amdgpu_get_dpm_state(struct device *dev,
		struct device_attribute *attr,
		char *buf)