[PATCH v2 2/3] drm/amd/display: send the 3D_Ext_Data byte for top-and-bottom too

[Adrian Betschart <adrian.betschart@cinemaone.ch>]

HDMI 1.4b only requires the 3D_Ext_Data byte for the side-by-side
(half) structure, and the vendor infoframe for top-and-bottom is
built with a 5-byte payload accordingly. At least one sink family
ignores a top-and-bottom VSIF without the sixth byte: a JVC DLA-RS4100
(D-ILA, "ILAFPJ--X214A") stays in 2D on the 5-byte frame and engages
its 3D mode the moment the byte is present. Amlogic sources send the
6-byte form for top-and-bottom, which is why the same projector works
with them.

Send the extra byte, zero, for top-and-bottom as well. Sinks that do
not need it ignore a zero 3D_Ext_Data field.

Signed-off-by: Adrian Betschart <adrian.betschart@cinemaone.ch>
---
 drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c b/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c
index 13478b8bd..3e41b33ea 100644
--- a/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c
+++ b/drivers/gpu/drm/amd/display/modules/info_packet/info_packet.c
@@ -574,6 +574,7 @@ void mod_build_hf_vsif_infopacket(const struct dc_stream_state *stream,
 			case TIMING_3D_FORMAT_TOP_AND_BOTTOM:
 			case TIMING_3D_FORMAT_TB_SW_PACKED:
 				info_packet->sb[5] = (0x6 << 4);
+				length = 6;
 				break;
 
 			default:
-- 
2.43.0