drm: add support for additional stereo 3D modes

Parse the 3D_Structure_ALL and 3D_MASK fields of the HDMI Vendor
Specific Data Block to expose more stereo 3D modes.

v2: Use (1 << 0) for consistency. (Ville Syrjälä)
    Skip adding any modes if 3D_MASK is indicated as being present but
    the length only includes 3D_Structure_ALL. (Ville Syrjälä)
    Check that the value of HDMI_3D_LEN is large enough to include
    3D_Structure_ALL and 3D_MASK, if they are present. (Ville Syrjälä)
v3: Increment offset before the length checks. (Ville Syrjälä)

Signed-off-by: Thomas Wood <thomas.wood@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 9e81609..f1764ec 100644 (file)
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2652,6 +2652,50 @@ static int add_hdmi_mode(struct drm_connector *connector, u8 vic)
        return 1;
 }
 
+static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
+                              const u8 *video_db, u8 video_len, u8 video_index)
+{
+       struct drm_device *dev = connector->dev;
+       struct drm_display_mode *newmode;
+       int modes = 0;
+       u8 cea_mode;
+
+       if (video_db == NULL || video_index > video_len)
+               return 0;
+
+       /* CEA modes are numbered 1..127 */
+       cea_mode = (video_db[video_index] & 127) - 1;
+       if (cea_mode >= ARRAY_SIZE(edid_cea_modes))
+               return 0;
+
+       if (structure & (1 << 0)) {
+               newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
+               if (newmode) {
+                       newmode->flags |= DRM_MODE_FLAG_3D_FRAME_PACKING;
+                       drm_mode_probed_add(connector, newmode);
+                       modes++;
+               }
+       }
+       if (structure & (1 << 6)) {
+               newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
+               if (newmode) {
+                       newmode->flags |= DRM_MODE_FLAG_3D_TOP_AND_BOTTOM;
+                       drm_mode_probed_add(connector, newmode);
+                       modes++;
+               }
+       }
+       if (structure & (1 << 8)) {
+               newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
+               if (newmode) {
+                       newmode->flags = DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF;
+                       drm_mode_probed_add(connector, newmode);
+                       modes++;
+               }
+       }
+
+       return modes;
+}
+
 /*
  * do_hdmi_vsdb_modes - Parse the HDMI Vendor Specific data block
  * @connector: connector corresponding to the HDMI sink
@@ -2662,10 +2706,13 @@ static int add_hdmi_mode(struct drm_connector *connector, u8 vic)
  * also adds the stereo 3d modes when applicable.
  */
 static int
-do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len)
+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;
-       u8 vic_len;
+       int modes = 0, offset = 0, i, multi_present = 0;
+       u8 vic_len, hdmi_3d_len = 0;
+       u16 mask;
+       u16 structure_all;
 
        if (len < 8)
                goto out;
@@ -2689,11 +2736,16 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len)
 
        /* 3D_Present */
        offset++;
-       if (db[8 + offset] & (1 << 7))
+       if (db[8 + offset] & (1 << 7)) {
                modes += add_hdmi_mandatory_stereo_modes(connector);
 
+               /* 3D_Multi_present */
+               multi_present = (db[8 + offset] & 0x60) >> 5;
+       }
+
        offset++;
        vic_len = db[8 + offset] >> 5;
+       hdmi_3d_len = db[8 + offset] & 0x1f;
 
        for (i = 0; i < vic_len && len >= (9 + offset + i); i++) {
                u8 vic;
@@ -2701,6 +2753,35 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len)
                vic = db[9 + offset + i];
                modes += add_hdmi_mode(connector, vic);
        }
+       offset += 1 + vic_len;
+
+       if (!(multi_present == 1 || multi_present == 2))
+               goto out;
+
+       if ((multi_present == 1 && len < (9 + offset)) ||
+           (multi_present == 2 && len < (11 + offset)))
+               goto out;
+
+       if ((multi_present == 1 && hdmi_3d_len < 2) ||
+           (multi_present == 2 && hdmi_3d_len < 4))
+               goto out;
+
+       /* 3D_Structure_ALL */
+       structure_all = (db[8 + offset] << 8) | db[9 + offset];
+
+       /* check if 3D_MASK is present */
+       if (multi_present == 2)
+               mask = (db[10 + offset] << 8) | db[11 + offset];
+       else
+               mask = 0xffff;
+
+       for (i = 0; i < 16; i++) {
+               if (mask & (1 << i))
+                       modes += add_3d_struct_modes(connector,
+                                                    structure_all,
+                                                    video_db,
+                                                    video_len, i);
+       }
 
 out:
        return modes;
@@ -2759,8 +2840,8 @@ static int
 add_cea_modes(struct drm_connector *connector, struct edid *edid)
 {
        const u8 *cea = drm_find_cea_extension(edid);
-       const u8 *db, *hdmi = NULL;
-       u8 dbl, hdmi_len;
+       const u8 *db, *hdmi = NULL, *video = NULL;
+       u8 dbl, hdmi_len, video_len = 0;
        int modes = 0;
 
        if (cea && cea_revision(cea) >= 3) {
@@ -2773,8 +2854,11 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid)
                        db = &cea[i];
                        dbl = cea_db_payload_len(db);
 
-                       if (cea_db_tag(db) == VIDEO_BLOCK)
-                               modes += do_cea_modes(connector, db + 1, dbl);
+                       if (cea_db_tag(db) == VIDEO_BLOCK) {
+                               video = db + 1;
+                               video_len = dbl;
+                               modes += do_cea_modes(connector, video, dbl);
+                       }
                        else if (cea_db_is_hdmi_vsdb(db)) {
                                hdmi = db;
                                hdmi_len = dbl;
@@ -2787,7 +2871,8 @@ add_cea_modes(struct drm_connector *connector, struct edid *edid)
         * be patching their flags when the sink supports stereo 3D.
         */
        if (hdmi)
-               modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len);
+               modes += do_hdmi_vsdb_modes(connector, hdmi, hdmi_len, video,
+                                           video_len);
 
        return modes;
 }