diff options
Diffstat (limited to 'common/edid.c')
| -rw-r--r-- | common/edid.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/common/edid.c b/common/edid.c index ab7069f..19410aa 100644 --- a/common/edid.c +++ b/common/edid.c @@ -136,6 +136,39 @@ static void decode_timing(u8 *buf, struct display_timing *timing) va + vbl, vborder); } +/** + * Check if HDMI vendor specific data block is present in CEA block + * @param info CEA extension block + * @return true if block is found + */ +static bool cea_is_hdmi_vsdb_present(struct edid_cea861_info *info) +{ + u8 end, i = 0; + + /* check for end of data block */ + end = info->dtd_offset; + if (end == 0) + end = 127; + if (end < 4 || end > 127) + return false; + end -= 4; + + while (i < end) { + /* Look for vendor specific data block of appropriate size */ + if ((EDID_CEA861_DB_TYPE(*info, i) == EDID_CEA861_DB_VENDOR) && + (EDID_CEA861_DB_LEN(*info, i) >= 5)) { + u8 *db = &info->data[i + 1]; + u32 oui = db[0] | (db[1] << 8) | (db[2] << 16); + + if (oui == HDMI_IEEE_OUI) + return true; + } + i += EDID_CEA861_DB_LEN(*info, i) + 1; + } + + return false; +} + int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing, int *panel_bits_per_colourp) { @@ -181,6 +214,15 @@ int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing, ((edid->video_input_definition & 0x70) >> 3) + 4; } + timing->hdmi_monitor = false; + if (edid->extension_flag && (buf_size >= EDID_EXT_SIZE)) { + struct edid_cea861_info *info = + (struct edid_cea861_info *)(buf + sizeof(*edid)); + + if (info->extension_tag == EDID_CEA861_EXTENSION_TAG) + timing->hdmi_monitor = cea_is_hdmi_vsdb_present(info); + } + return 0; } |