[PATCH 4/4] drm/edid: update non-desktop use also from DisplayID

[Jani Nikula]

Use the DisplayID 2.0 primary use case information to deduce whether
this is a head-mounted display, and should not be used for desktop.

Cc: Iaroslav Boliukin <iam at lach.pw>
Cc: Dmitry Osipenko <dmitry.osipenko at collabora.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/drm_edid.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 3d0a4da661bc..03ad53a1ba82 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -6433,6 +6433,29 @@ static void drm_reset_display_info(struct drm_connector *connector)
 	info->quirks = 0;
 }
 
+static void update_displayid_info(struct drm_connector *connector,
+				  const struct drm_edid *drm_edid)
+{
+	struct drm_display_info *info = &connector->display_info;
+	const struct displayid_block *block;
+	struct displayid_iter iter;
+
+	displayid_iter_edid_begin(drm_edid, &iter);
+	displayid_iter_for_each(block, &iter) {
+		if (displayid_version(&iter) == DISPLAY_ID_STRUCTURE_VER_20 &&
+		    (displayid_primary_use(&iter) == PRIMARY_USE_HEAD_MOUNTED_VR ||
+		     displayid_primary_use(&iter) == PRIMARY_USE_HEAD_MOUNTED_AR))
+			info->non_desktop = true;
+
+		/*
+		 * We're only interested in the base section here, no need to
+		 * iterate further.
+		 */
+		break;
+	}
+	displayid_iter_end(&iter);
+}
+
 static void update_display_info(struct drm_connector *connector,
 				const struct drm_edid *drm_edid)
 {
@@ -6463,6 +6486,8 @@ static void update_display_info(struct drm_connector *connector,
 	info->color_formats |= DRM_COLOR_FORMAT_RGB444;
 	drm_parse_cea_ext(connector, drm_edid);
 
+	update_displayid_info(connector, drm_edid);
+
 	/*
 	 * Digital sink with "DFP 1.x compliant TMDS" according to EDID 1.3?
 	 *
-- 
2.34.1