101 lines
3.0 KiB
Diff
101 lines
3.0 KiB
Diff
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diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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index 3c826a9a593ed88c5ec4e6e6c2dd448812199e8c..5fe8dc6536966ce0bc9017dbec5445833b80ae92 100644
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--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -6437,10 +6437,81 @@ int amdgpu_dm_connector_atomic_get_property(struct drm_connector *connector,
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return ret;
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}
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+/**
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+ * DOC: panel power savings
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+ *
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+ * The display manager allows you to set your desired **panel power savings**
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+ * level (between 0-4, with 0 representing off), e.g. using the following::
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+ *
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+ * # echo 3 > /sys/class/drm/card0-eDP-1/amdgpu/panel_power_savings
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+ *
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+ * Modifying this value can have implications on color accuracy, so tread
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+ * carefully.
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+ */
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+
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+static ssize_t panel_power_savings_show(struct device *device,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct drm_connector *connector = dev_get_drvdata(device);
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+ struct drm_device *dev = connector->dev;
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+ u8 val;
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+
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+ drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
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+ val = to_dm_connector_state(connector->state)->abm_level ==
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+ ABM_LEVEL_IMMEDIATE_DISABLE ? 0 :
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+ to_dm_connector_state(connector->state)->abm_level;
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+ drm_modeset_unlock(&dev->mode_config.connection_mutex);
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+
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+ return sysfs_emit(buf, "%u\n", val);
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+}
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+
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+static ssize_t panel_power_savings_store(struct device *device,
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+ struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ struct drm_connector *connector = dev_get_drvdata(device);
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+ struct drm_device *dev = connector->dev;
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+ long val;
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+ int ret;
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+
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+ ret = kstrtol(buf, 0, &val);
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+
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+ if (ret)
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+ return ret;
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+
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+ if (val < 0 || val > 4)
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+ return -EINVAL;
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+
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+ drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
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+ to_dm_connector_state(connector->state)->abm_level = val ?:
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+ ABM_LEVEL_IMMEDIATE_DISABLE;
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+ drm_modeset_unlock(&dev->mode_config.connection_mutex);
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+
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+ drm_kms_helper_hotplug_event(dev);
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+
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+ return count;
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+}
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+
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+static DEVICE_ATTR_RW(panel_power_savings);
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+
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+static struct attribute *amdgpu_attrs[] = {
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+ &dev_attr_panel_power_savings.attr,
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+ NULL
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+};
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+
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+static const struct attribute_group amdgpu_group = {
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+ .name = "amdgpu",
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+ .attrs = amdgpu_attrs
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+};
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+
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static void amdgpu_dm_connector_unregister(struct drm_connector *connector)
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{
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struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
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+ if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
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+ sysfs_remove_group(&connector->kdev->kobj, &amdgpu_group);
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+
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drm_dp_aux_unregister(&amdgpu_dm_connector->dm_dp_aux.aux);
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}
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@@ -6542,6 +6613,13 @@ amdgpu_dm_connector_late_register(struct drm_connector *connector)
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to_amdgpu_dm_connector(connector);
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int r;
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+ if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
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+ r = sysfs_create_group(&connector->kdev->kobj,
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+ &amdgpu_group);
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+ if (r)
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+ return r;
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+ }
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+
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amdgpu_dm_register_backlight_device(amdgpu_dm_connector);
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if ((connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
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