From: Jani Nikula <jani.nikula@intel.com>
Date: Wed, 4 Jan 2023 12:05:17 +0200
Subject: [PATCH] drm/edid: fix parsing of 3D modes from HDMI VSDB
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References: bsc#1012628
Patch-mainline: 6.2.3
Git-commit: 72794d16bd535a984e6653a18f5862405b49b5f9

commit 72794d16bd535a984e6653a18f5862405b49b5f9 upstream.

Commit 537d9ed2f6c1 ("drm/edid: convert add_cea_modes() to use cea db
iter") inadvertently moved the do_hdmi_vsdb_modes() call within the db
iteration loop, always passing NULL as the CTA VDB to
do_hdmi_vsdb_modes(), skipping a lot of stereo modes.

Move the call back outside of the loop.

This does mean only one CTA VDB and HDMI VSDB combination will be
handled, but it's an unlikely scenario to have more than one of either
block, and it was not accounted for before the regression either.

Fixes: 537d9ed2f6c1 ("drm/edid: convert add_cea_modes() to use cea db iter")
Cc: <stable@vger.kernel.org> # v6.0+
Cc: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/cf159b8816191ed595a3cb954acaf189c4528cc7.1672826282.git.jani.nikula@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/gpu/drm/drm_edid.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 23f7146e..b94adb9b 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5249,13 +5249,12 @@ static int add_cea_modes(struct drm_connector *connector,
 {
 	const struct cea_db *db;
 	struct cea_db_iter iter;
+	const u8 *hdmi = NULL, *video = NULL;
+	u8 hdmi_len = 0, video_len = 0;
 	int modes = 0;
 
 	cea_db_iter_edid_begin(drm_edid, &iter);
 	cea_db_iter_for_each(db, &iter) {
-		const u8 *hdmi = NULL, *video = NULL;
-		u8 hdmi_len = 0, video_len = 0;
-
 		if (cea_db_tag(db) == CTA_DB_VIDEO) {
 			video = cea_db_data(db);
 			video_len = cea_db_payload_len(db);
@@ -5271,18 +5270,17 @@ static int add_cea_modes(struct drm_connector *connector,
 			modes += do_y420vdb_modes(connector, vdb420,
 						  cea_db_payload_len(db) - 1);
 		}
-
-		/*
-		 * We parse the HDMI VSDB after having added the cea modes as we
-		 * will be patching their flags when the sink supports stereo
-		 * 3D.
-		 */
-		if (hdmi)
-			modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len,
-						    video, video_len);
 	}
 	cea_db_iter_end(&iter);
 
+	/*
+	 * We parse the HDMI VSDB after having added the cea modes as we will be
+	 * patching their flags when the sink supports stereo 3D.
+	 */
+	if (hdmi)
+		modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len,
+					    video, video_len);
+
 	return modes;
 }
 
-- 
2.35.3