[PATCH v2 09/20] drm/edid: convert drm_edid_to_speaker_allocation() to use cea db iter

[Jani Nikula <jani.nikula@xxxxxxxxx>]

Use the cea db iterator for speaker allocation. We'll still stop at the
first speaker data block, but not at the first CTA extension if that
doesn't have the info.

Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c | 47 ++++++++++++--------------------------
 1 file changed, 15 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 5c3e2ed53012..7d6bf0b2bd9e 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5069,42 +5069,25 @@ EXPORT_SYMBOL(drm_edid_to_sad);
  */
 int drm_edid_to_speaker_allocation(const struct edid *edid, u8 **sadb)
 {
+	const struct cea_db *db;
+	struct cea_db_iter iter;
 	int count = 0;
-	int i, start, end, dbl;
-	const u8 *cea;
 
-	cea = drm_find_cea_extension(edid);
-	if (!cea) {
-		DRM_DEBUG_KMS("SAD: no CEA Extension found\n");
-		return 0;
-	}
-
-	if (cea_revision(cea) < 3) {
-		DRM_DEBUG_KMS("SAD: wrong CEA revision\n");
-		return 0;
-	}
-
-	if (cea_db_offsets(cea, &start, &end)) {
-		DRM_DEBUG_KMS("SAD: invalid data block offsets\n");
-		return -EPROTO;
-	}
-
-	for_each_cea_db(cea, i, start, end) {
-		const u8 *db = &cea[i];
-
-		if (cea_db_tag(db) == CTA_DB_SPEAKER) {
-			dbl = cea_db_payload_len(db);
-
-			/* Speaker Allocation Data Block */
-			if (dbl == 3) {
-				*sadb = kmemdup(&db[1], dbl, GFP_KERNEL);
-				if (!*sadb)
-					return -ENOMEM;
-				count = dbl;
-				break;
-			}
+	cea_db_iter_edid_begin(edid, &iter);
+	cea_db_iter_for_each(db, &iter) {
+		if (cea_db_tag(db) == CTA_DB_SPEAKER &&
+		    cea_db_payload_len(db) == 3) {
+			*sadb = kmemdup(db->data, cea_db_payload_len(db),
+					GFP_KERNEL);
+			if (!*sadb)
+				return -ENOMEM;
+			count = cea_db_payload_len(db);
+			break;
 		}
 	}
+	cea_db_iter_end(&iter);
+
+	DRM_DEBUG_KMS("Found %d Speaker Allocation Data Blocks\n", count);
 
 	return count;
 }
-- 
2.30.2