drm: add connector info/property for non-desktop displays [v2]

This adds the infrastructure needed to quirk displays
using edid and to mark them a non-desktop.

A non-desktop display is one which shouldn't normally be included
as a part of a desktop environment.

This is meant to cover head mounted devices like HTC Vive.

v2: Change description from non-standard to non-desktop, add docs
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

fixup docs

drivers/gpu/drm/drm_connector.c

@@ -234,6 +234,10 @@ int drm_connector_init(struct drm_device *dev,
 				   config->link_status_property,
 				   0);
 
+	drm_object_attach_property(&connector->base,
+				   config->non_desktop_property,
+				   0);
+
 	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 		drm_object_attach_property(&connector->base, config->prop_crtc_id, 0);
 	}
@@ -763,6 +767,10 @@ DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
  *      value of link-status is "GOOD". If something fails during or after modeset,
  *      the kernel driver may set this to "BAD" and issue a hotplug uevent. Drivers
  *      should update this value using drm_mode_connector_set_link_status_property().
+ * non_desktop:
+ * 	Indicates the output should be ignored for purposes of displaying a
+ * 	standard desktop environment or console. This is most likely because
+ * 	the output device is not rectilinear.
  *
  * Connectors also have one standardized atomic property:
  *
@@ -811,6 +819,11 @@ int drm_connector_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.link_status_property = prop;
 
+	prop = drm_property_create_bool(dev, DRM_MODE_PROP_IMMUTABLE, "non-desktop");
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.non_desktop_property = prop;
+
 	return 0;
 }
 
@@ -1194,6 +1207,10 @@ int drm_mode_connector_update_edid_property(struct drm_connector *connector,
 	if (edid)
 		size = EDID_LENGTH * (1 + edid->extensions);
 
+	drm_object_property_set_value(&connector->base,
+				      dev->mode_config.non_desktop_property,
+				      connector->display_info.non_desktop);
+
 	ret = drm_property_replace_global_blob(dev,
 					       &connector->edid_blob_ptr,
 	                                       size,

drivers/gpu/drm/drm_edid.c

@@ -82,6 +82,8 @@
 #define EDID_QUIRK_FORCE_6BPC			(1 << 10)
 /* Force 10bpc */
 #define EDID_QUIRK_FORCE_10BPC			(1 << 11)
+/* Non desktop display (i.e. HMD) */
+#define EDID_QUIRK_NON_DESKTOP			(1 << 12)
 
 struct detailed_mode_closure {
 	struct drm_connector *connector;
@@ -4393,7 +4395,7 @@ static void drm_parse_cea_ext(struct drm_connector *connector,
 }
 
 static void drm_add_display_info(struct drm_connector *connector,
-				 struct edid *edid)
+				 struct edid *edid, u32 quirks)
 {
 	struct drm_display_info *info = &connector->display_info;
 
@@ -4407,6 +4409,8 @@ static void drm_add_display_info(struct drm_connector *connector,
 	info->max_tmds_clock = 0;
 	info->dvi_dual = false;
 
+	info->non_desktop = !!(quirks & EDID_QUIRK_NON_DESKTOP);
+
 	if (edid->revision < 3)
 		return;
 
@@ -4627,7 +4631,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid)
 	 * To avoid multiple parsing of same block, lets parse that map
 	 * from sink info, before parsing CEA modes.
 	 */
-	drm_add_display_info(connector, edid);
+	drm_add_display_info(connector, edid, quirks);
 
 	/*
 	 * EDID spec says modes should be preferred in this order:

include/drm/drm_connector.h

@@ -284,6 +284,11 @@ struct drm_display_info {
 	 * @hdmi: advance features of a HDMI sink.
 	 */
 	struct drm_hdmi_info hdmi;
+
+	/**
+	 * @non_desktop: Non desktop display (HMD).
+	 */
+	bool non_desktop;
 };
 
 int drm_display_info_set_bus_formats(struct drm_display_info *info,

include/drm/drm_mode_config.h

@@ -728,6 +728,13 @@ struct drm_mode_config {
 	 */
 	struct drm_property *suggested_y_property;
 
+	/**
+	 * @non_desktop_property: Optional connector property with a hint
+	 * that device isn't a standard display, and the console/desktop,
+	 * should not be displayed on it.
+	 */
+	struct drm_property *non_desktop_property;
+
 	/* dumb ioctl parameters */
 	uint32_t preferred_depth, prefer_shadow;