diff options
Diffstat (limited to 'drivers/gpu/drm/drm_connector.c')
| -rw-r--r-- | drivers/gpu/drm/drm_connector.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index ead26bfc30ca..da8ae80c2750 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -932,6 +932,13 @@ DRM_ENUM_NAME_FN(drm_get_content_protection_name, drm_cp_enum_list) * is no longer protected and userspace should take appropriate action * (whatever that might be). * + * max bpc: + * This range property is used by userspace to limit the bit depth. When + * used the driver would limit the bpc in accordance with the valid range + * supported by the hardware and sink. Drivers to use the function + * drm_connector_attach_max_bpc_property() to create and attach the + * property to the connector during initialization. + * * Connectors also have one standardized atomic property: * * CRTC_ID: @@ -1699,6 +1706,40 @@ void drm_connector_set_link_status_property(struct drm_connector *connector, EXPORT_SYMBOL(drm_connector_set_link_status_property); /** + * drm_connector_attach_max_bpc_property - attach "max bpc" property + * @connector: connector to attach max bpc property on. + * @min: The minimum bit depth supported by the connector. + * @max: The maximum bit depth supported by the connector. + * + * This is used to add support for limiting the bit depth on a connector. + * + * Returns: + * Zero on success, negative errno on failure. + */ +int drm_connector_attach_max_bpc_property(struct drm_connector *connector, + int min, int max) +{ + struct drm_device *dev = connector->dev; + struct drm_property *prop; + + prop = connector->max_bpc_property; + if (!prop) { + prop = drm_property_create_range(dev, 0, "max bpc", min, max); + if (!prop) + return -ENOMEM; + + connector->max_bpc_property = prop; + } + + drm_object_attach_property(&connector->base, prop, max); + connector->state->max_requested_bpc = max; + connector->state->max_bpc = max; + + return 0; +} +EXPORT_SYMBOL(drm_connector_attach_max_bpc_property); + +/** * drm_connector_set_vrr_capable_property - sets the variable refresh rate * capable property for a connector * @connector: drm connector |