The `panel_power_saving` DRM property is an optional property that
can be added to a connector by a driver.
This property is for compositors to indicate intent of allowing
policy for the driver to use power saving features that may
compromise color fidelity.
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
drivers/gpu/drm/drm_connector.c | 36 +++++++++++++++++++++++++++++++++
include/drm/drm_connector.h | 1 +
include/drm/drm_mode_config.h | 6 ++++++
include/uapi/drm/drm_mode.h | 4 ++++
4 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 4d2df7f64dc5..ccf672c55e0c 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -961,6 +961,11 @@ static const struct drm_prop_enum_list drm_scaling_mode_enum_list[] = {
{ DRM_MODE_SCALE_ASPECT, "Full aspect" },
};
+static const struct drm_prop_enum_list drm_panel_power_saving_enum_list[] = {
+ { DRM_MODE_PANEL_POWER_SAVING_ALLOWED, "Allowed" },
+ { DRM_MODE_PANEL_POWER_SAVING_FORBIDDEN, "Forbidden" },
+};
+
static const struct drm_prop_enum_list drm_aspect_ratio_enum_list[] = {
{ DRM_MODE_PICTURE_ASPECT_NONE, "Automatic" },
{ DRM_MODE_PICTURE_ASPECT_4_3, "4:3" },
@@ -1963,6 +1968,37 @@ int drm_mode_create_scaling_mode_property(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_mode_create_scaling_mode_property);
+/**
+ * drm_mode_create_panel_power_saving_property - create panel power saving property
+ * @dev: DRM device
+ *
+ * Called by a driver the first time it's needed, must be attached to desired
+ * connectors.
+ *
+ * Atomic drivers should use drm_mode_create_panel_power_saving_property()
+ * instead to correctly assign &drm_connector_state.panel_power_saving
+ * in the atomic state.
+ *
+ * Returns: %0
+ */
+int drm_mode_create_panel_power_saving_property(struct drm_device *dev)
+{
+ struct drm_property *panel_power_saving;
+
+ if (dev->mode_config.panel_power_saving)
+ return 0;
+
+ panel_power_saving =
+ drm_property_create_enum(dev, 0, "panel power saving",
+ drm_panel_power_saving_enum_list,
+ ARRAY_SIZE(drm_panel_power_saving_enum_list));
+
+ dev->mode_config.panel_power_saving = panel_power_saving;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_mode_create_panel_power_saving_property);
+
/**
* DOC: Variable refresh properties
*
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index fe88d7fc6b8f..4ea3f912c641 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -2025,6 +2025,7 @@ int drm_mode_create_dp_colorspace_property(struct drm_connector *connector,
u32 supported_colorspaces);
int drm_mode_create_content_type_property(struct drm_device *dev);
int drm_mode_create_suggested_offset_properties(struct drm_device *dev);
+int drm_mode_create_panel_power_saving_property(struct drm_device *dev);
int drm_connector_set_path_property(struct drm_connector *connector,
const char *path);
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 973119a9176b..099ad2d8c5c1 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -954,6 +954,12 @@ struct drm_mode_config {
*/
struct drm_atomic_state *suspend_state;
+ /**
+ * @panel_power_saving: DRM ENUM property for type of
+ * Panel Power Saving.
+ */
+ struct drm_property *panel_power_saving;
+
const struct drm_mode_config_helper_funcs *helper_private;
};
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 7040e7ea80c7..82e565cc76fb 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -152,6 +152,10 @@ extern "C" {
#define DRM_MODE_SCALE_CENTER 2 /* Centered, no scaling */
#define DRM_MODE_SCALE_ASPECT 3 /* Full screen, preserve aspect */
+/* Panel power saving options */
+#define DRM_MODE_PANEL_POWER_SAVING_ALLOWED 0 /* Panel power savings features allowed */
+#define DRM_MODE_PANEL_POWER_SAVING_FORBIDDEN 1 /* Panel power savings features not allowed */
+
/* Dithering mode options */
#define DRM_MODE_DITHERING_OFF 0
#define DRM_MODE_DITHERING_ON 1
--
2.45.0
