[PATCH v2 1/3] drm/edid: extract section header processing into helper

[Chenyu Chen <chen-yu.chen@amd.com>]

Extract the DisplayID section header logging and non_desktop
detection from update_displayid_info() into a dedicated helper,
drm_displayid_process_section_header(). Remove the break so the
iterator walks through all data blocks, preparing for future
patches that will parse additional block types within the loop.

The helper is called only once for the base section via a
header_processed flag. Since version and primary_use are only
captured from the base section, and extension sections carry a
primary use of zero per spec, the non_desktop logic is unaffected.

No functional change.

Assisted-by: Copilot:Claude-Opus-4.6
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
---
 drivers/gpu/drm/drm_edid.c | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 8031f021d4d0..04878478ab78 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -6715,30 +6715,35 @@ static void drm_reset_display_info(struct drm_connector *connector)
 	memset(&info->amd_vsdb, 0, sizeof(info->amd_vsdb));
 }
 
+static void drm_displayid_process_section_header(struct drm_connector *connector,
+				  const struct displayid_iter *iter)
+{
+	struct drm_display_info *info = &connector->display_info;
+
+	drm_dbg_kms(connector->dev,
+			"[CONNECTOR:%d:%s] DisplayID extension version 0x%02x, primary use 0x%02x\n",
+			connector->base.id, connector->name,
+			displayid_version(iter),
+			displayid_primary_use(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;
+}
+
 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;
+	bool header_processed = false;
 
 	displayid_iter_edid_begin(drm_edid, &iter);
 	displayid_iter_for_each(block, &iter) {
-		drm_dbg_kms(connector->dev,
-			    "[CONNECTOR:%d:%s] DisplayID extension version 0x%02x, primary use 0x%02x\n",
-			    connector->base.id, connector->name,
-			    displayid_version(&iter),
-			    displayid_primary_use(&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;
+		if (!header_processed) {
+			drm_displayid_process_section_header(connector, &iter);
+			header_processed = true;
+		}
 	}
 	displayid_iter_end(&iter);
 }
-- 
2.43.0