[PATCH 5/4] drm/edid: parse Tiled Display Topology Data Block for DisplayID 2.0

[Jani Nikula]

Currently we only parse the Tiled Display Topology Data Block for
DisplayID structure version 1.2, but not 2.0. The contents seem to be
the same for both, so expand the parsing to structure version 2.0.

Note that DisplayID spec version is not the same as DisplayID structure
version; DisplayID 1.3 uses structure version 1.2, and DisplayID 2.0-2.1
use structure version 2.0. Lovely.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/drm_edid.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 03ad53a1ba82..ebab862b8b1a 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -7267,6 +7267,15 @@ static void drm_parse_tiled_block(struct drm_connector *connector,
 	}
 }
 
+static bool displayid_is_tiled_block(const struct displayid_iter *iter,
+				     const struct displayid_block *block)
+{
+	return (displayid_version(iter) == DISPLAY_ID_STRUCTURE_VER_12 &&
+		block->tag == DATA_BLOCK_TILED_DISPLAY) ||
+		(displayid_version(iter) == DISPLAY_ID_STRUCTURE_VER_20 &&
+		 block->tag == DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY);
+}
+
 static void _drm_update_tile_info(struct drm_connector *connector,
 				  const struct drm_edid *drm_edid)
 {
@@ -7277,7 +7286,7 @@ static void _drm_update_tile_info(struct drm_connector *connector,
 
 	displayid_iter_edid_begin(drm_edid, &iter);
 	displayid_iter_for_each(block, &iter) {
-		if (block->tag == DATA_BLOCK_TILED_DISPLAY)
+		if (displayid_is_tiled_block(&iter, block))
 			drm_parse_tiled_block(connector, block);
 	}
 	displayid_iter_end(&iter);
-- 
2.34.1