[PATCH 3/3] drm/edid: parse the list of additional 3D modes

[Thomas Wood <thomas.wood@xxxxxxxxx>]

Parse 2D_VIC_order_X and 3D_Structure_X from the list at the end of the
HDMI Vendor Specific Data Block.

v2: Use an offset value depending on 3D_Multi_present and add
    detail_present. (Ville Syrjälä)

Signed-off-by: Thomas Wood <thomas.wood@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c | 64 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 59 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f1d6e1e..9426563 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2734,7 +2734,7 @@ static int
 do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len,
 		   const u8 *video_db, u8 video_len)
 {
-	int modes = 0, offset = 0, i, multi_present = 0;
+	int modes = 0, offset = 0, i, multi_present = 0, multi_len;
 	u8 vic_len, hdmi_3d_len = 0;
 	u16 mask;
 	u16 structure_all;
@@ -2783,12 +2783,15 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len,
 	if (!(multi_present == 1 || multi_present == 2))
 		goto out;
 
-	if ((multi_present == 1 && len < (9 + offset)) ||
-	    (multi_present == 2 && len < (11 + offset)))
+	if (multi_present == 1)
+		multi_len = 2;
+	else
+		multi_len = 4;
+
+	if (len < (offset + hdmi_3d_len))
 		goto out;
 
-	if ((multi_present == 1 && hdmi_3d_len < 2) ||
-	    (multi_present == 2 && hdmi_3d_len < 4))
+	if (hdmi_3d_len < multi_len)
 		goto out;
 
 	/* 3D_Structure_ALL */
@@ -2808,6 +2811,57 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len,
 						     video_len, i);
 	}
 
+	if (hdmi_3d_len <= multi_len)
+		goto out;
+
+	offset += multi_len;
+
+	for (i = 0; i < (hdmi_3d_len - multi_len); i++) {
+		int vic_index;
+		struct drm_display_mode *newmode = NULL;
+		unsigned int newflag = 0;
+		bool detail_present;
+
+		detail_present = ((db[8 + offset + i] & 0x0f) > 7);
+
+		if (detail_present && (i + 1 == hdmi_3d_len - multi_len))
+			break;
+
+		/* 2D_VIC_order_X */
+		vic_index = db[8 + offset + i] >> 4;
+
+		/* 3D_Structure_X */
+		switch (db[8 + offset + i] & 0x0f) {
+		case 0:
+			newflag = DRM_MODE_FLAG_3D_FRAME_PACKING;
+			break;
+		case 6:
+			newflag = DRM_MODE_FLAG_3D_TOP_AND_BOTTOM;
+			break;
+		case 8:
+			/* 3D_Detail_X */
+			if ((db[9 + offset + i] >> 4) == 1)
+				newflag = DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF;
+			break;
+		}
+
+		if (newflag != 0) {
+			newmode = drm_display_mode_from_vic_index(connector,
+								  video_db,
+								  video_len,
+								  vic_index);
+
+			if (newmode) {
+				newmode->flags |= newflag;
+				drm_mode_probed_add(connector, newmode);
+				modes++;
+			}
+		}
+
+		if (detail_present)
+			i++;
+	}
+
 out:
 	return modes;
 }
-- 
1.8.4.2

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