[PATCH 1/4] drm: add edid_overridden flag to drm_connector

[Johannes Wüller]

When an EDID override is in effect, the physical connector may not
match reported capabilities. Adds a drm_connector flag that allows
drivers to detect such mismatches.

Signed-off-by: Johannes Wüller <johanneswueller@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c  | 2 ++
 include/drm/drm_connector.h | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 26bb7710a462..9b0f410ea2de 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2373,6 +2373,7 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector,
 	struct edid *edid, *new;
 	size_t alloc_size = EDID_LENGTH;
 
+	connector->edid_overridden = false;
 	override = drm_edid_override_get(connector);
 	if (override) {
 		alloc_size = override->size;
@@ -2380,6 +2381,7 @@ static struct edid *_drm_do_get_edid(struct drm_connector *connector,
 		drm_edid_free(override);
 		if (!edid)
 			return NULL;
+		connector->edid_overridden = true;
 		goto ok;
 	}
 
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index c18be8c19de0..43d7ac31deba 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -2261,6 +2261,14 @@ struct drm_connector {
 	/** @bad_edid_counter: track sinks that give us an EDID with invalid checksum */
 	unsigned bad_edid_counter;
 
+	/**
+	 * @edid_overridden: Indicates whether the last read EDID was an
+	 * override (e.g. via debugfs edid_override or drm.edid_firmware kernel
+	 * parameter), which can cause the physical connector to differ from
+	 * the advertised capabilities.
+	 */
+	bool edid_overridden;
+
 	/**
 	 * @edid_corrupt: Indicates whether the last read EDID was corrupt. Used
 	 * in Displayport compliance testing - Displayport Link CTS Core 1.2
-- 
2.53.0