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authorAlex Deucher <alexander.deucher@amd.com>2018-04-19 13:56:41 -0500
committerAlex Deucher <alexander.deucher@amd.com>2018-05-15 13:43:44 -0500
commitca8d40ca194dfb573e59a5e42b88da83e63a6630 (patch)
treeb6ca5f0bd38246d42c5c38f560cd614941671712 /drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
parent8567f68147de1f09cc868b52b02a0c11dc048206 (diff)
download96b-common-ca8d40ca194dfb573e59a5e42b88da83e63a6630.tar.gz
drm/amdgpu/pm: document power_dpm_state
This is a legacy file and is only provided for backwards compatibility. Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Huang Rui <ray.huang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index ee11e92cc4d2..e33e0f4c4a28 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -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)