#define SPEAKER_BLOCK 0x04
#define USE_EXTENDED_TAG 0x07
#define EXT_VIDEO_CAPABILITY_BLOCK 0x00
+#define EXT_VIDEO_DATA_BLOCK_420 0x0E
+#define EXT_VIDEO_CAP_BLOCK_Y420CMDB 0x0F
#define EDID_BASIC_AUDIO (1 << 6)
#define EDID_CEA_YCRCB444 (1 << 5)
#define EDID_CEA_YCRCB422 (1 << 4)
return newmode;
}
+/*
+ * do_y420vdb_modes - Parse YCBCR 420 only modes
+ * @connector: connector corresponding to the HDMI sink
+ * @svds: start of the data block of CEA YCBCR 420 VDB
+ * @len: length of the CEA YCBCR 420 VDB
+ *
+ * Parse the CEA-861-F YCBCR 420 Video Data Block (Y420VDB)
+ * which contains modes which can be supported in YCBCR 420
+ * output format only.
+ */
+static int do_y420vdb_modes(struct drm_connector *connector,
+ const u8 *svds, u8 svds_len)
+{
+ int modes = 0, i;
+ struct drm_device *dev = connector->dev;
+ struct drm_display_info *info = &connector->display_info;
+ struct drm_hdmi_info *hdmi = &info->hdmi;
+
+ for (i = 0; i < svds_len; i++) {
+ u8 vic = svd_to_vic(svds[i]);
+ struct drm_display_mode *newmode;
+
+ if (!drm_valid_cea_vic(vic))
+ continue;
+
+ newmode = drm_mode_duplicate(dev, &edid_cea_modes[vic]);
+ if (!newmode)
+ break;
+ bitmap_set(hdmi->y420_vdb_modes, vic, 1);
+ drm_mode_probed_add(connector, newmode);
+ modes++;
+ }
+
+ if (modes > 0)
+ info->color_formats |= DRM_COLOR_FORMAT_YCRCB420;
+ return modes;
+}
+
+/*
+ * drm_add_cmdb_modes - Add a YCBCR 420 mode into bitmap
+ * @connector: connector corresponding to the HDMI sink
+ * @vic: CEA vic for the video mode to be added in the map
+ *
+ * Makes an entry for a videomode in the YCBCR 420 bitmap
+ */
+static void
+drm_add_cmdb_modes(struct drm_connector *connector, u8 svd)
+{
+ u8 vic = svd_to_vic(svd);
+ struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
+
+ if (!drm_valid_cea_vic(vic))
+ return;
+
+ bitmap_set(hdmi->y420_cmdb_modes, vic, 1);
+}
+
static int
do_cea_modes(struct drm_connector *connector, const u8 *db, u8 len)
{
int i, modes = 0;
+ struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
for (i = 0; i < len; i++) {
struct drm_display_mode *mode;
mode = drm_display_mode_from_vic_index(connector, db, len, i);
if (mode) {
+ /*
+ * YCBCR420 capability block contains a bitmap which
+ * gives the index of CEA modes from CEA VDB, which
+ * can support YCBCR 420 sampling output also (apart
+ * from RGB/YCBCR444 etc).
+ * For example, if the bit 0 in bitmap is set,
+ * first mode in VDB can support YCBCR420 output too.
+ * Add YCBCR420 modes only if sink is HDMI 2.0 capable.
+ */
+ if (i < 64 && hdmi->y420_cmdb_map & (1ULL << i))
+ drm_add_cmdb_modes(connector, db[i]);
+
drm_mode_probed_add(connector, mode);
modes++;
}
return oui == HDMI_FORUM_IEEE_OUI;
}
+static bool cea_db_is_y420cmdb(const u8 *db)
+{
+ if (cea_db_tag(db) != USE_EXTENDED_TAG)
+ return false;
+
+ if (!cea_db_payload_len(db))
+ return false;
+
+ if (cea_db_extended_tag(db) != EXT_VIDEO_CAP_BLOCK_Y420CMDB)
+ return false;
+
+ return true;
+}
+
+static bool cea_db_is_y420vdb(const u8 *db)
+{
+ if (cea_db_tag(db) != USE_EXTENDED_TAG)
+ return false;
+
+ if (!cea_db_payload_len(db))
+ return false;
+
+ if (cea_db_extended_tag(db) != EXT_VIDEO_DATA_BLOCK_420)
+ return false;
+
+ return true;
+}
+
#define for_each_cea_db(cea, i, start, end) \
for ((i) = (start); (i) < (end) && (i) + cea_db_payload_len(&(cea)[(i)]) < (end); (i) += cea_db_payload_len(&(cea)[(i)]) + 1)
+static void drm_parse_y420cmdb_bitmap(struct drm_connector *connector,
+ const u8 *db)
+{
+ struct drm_display_info *info = &connector->display_info;
+ struct drm_hdmi_info *hdmi = &info->hdmi;
+ u8 map_len = cea_db_payload_len(db) - 1;
+ u8 count;
+ u64 map = 0;
+
+ if (map_len == 0) {
+ /* All CEA modes support ycbcr420 sampling also.*/
+ hdmi->y420_cmdb_map = U64_MAX;
+ info->color_formats |= DRM_COLOR_FORMAT_YCRCB420;
+ return;
+ }
+
+ /*
+ * This map indicates which of the existing CEA block modes
+ * from VDB can support YCBCR420 output too. So if bit=0 is
+ * set, first mode from VDB can support YCBCR420 output too.
+ * We will parse and keep this map, before parsing VDB itself
+ * to avoid going through the same block again and again.
+ *
+ * Spec is not clear about max possible size of this block.
+ * Clamping max bitmap block size at 8 bytes. Every byte can
+ * address 8 CEA modes, in this way this map can address
+ * 8*8 = first 64 SVDs.
+ */
+ if (WARN_ON_ONCE(map_len > 8))
+ map_len = 8;
+
+ for (count = 0; count < map_len; count++)
+ map |= (u64)db[2 + count] << (8 * count);
+
+ if (map)
+ info->color_formats |= DRM_COLOR_FORMAT_YCRCB420;
+
+ hdmi->y420_cmdb_map = map;
+}
+
static int
add_cea_modes(struct drm_connector *connector, struct edid *edid)
{
video = db + 1;
video_len = dbl;
modes += do_cea_modes(connector, video, dbl);
- }
- else if (cea_db_is_hdmi_vsdb(db)) {
+ } else if (cea_db_is_hdmi_vsdb(db)) {
hdmi = db;
hdmi_len = dbl;
+ } else if (cea_db_is_y420vdb(db)) {
+ const u8 *vdb420 = &db[2];
+
+ /* Add 4:2:0(only) modes present in EDID */
+ modes += do_y420vdb_modes(connector,
+ vdb420,
+ dbl - 1);
}
}
}
drm_parse_hdmi_vsdb_video(connector, db);
if (cea_db_is_hdmi_forum_vsdb(db))
drm_parse_hdmi_forum_vsdb(connector, db);
+ if (cea_db_is_y420cmdb(db))
+ drm_parse_y420cmdb_bitmap(connector, db);
}
}
projects / openwrt / staging / blogic.git / commitdiff