video: Check EDID for HDMI connection

Check EDID Vendor Specific Data Block bytes to see if the connection
is HDMI and set FB_MISC_HDMI.

Signed-off-by: David Ung <davidu@nvidia.com>
Signed-off-by: Christopher Freeman <cfreeman@nvidia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/video/fbdev/core/fbmon.c b/drivers/video/fbdev/core/fbmon.c
index c204ebe6187e..5b0e313849bd 100644
--- a/drivers/video/fbdev/core/fbmon.c
+++ b/drivers/video/fbdev/core/fbmon.c
@@ -1012,13 +1012,20 @@ void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
         while (pos < edid[2]) {
                 u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
                 pr_debug("Data block %u of %u bytes\n", type, len);
-                if (type == 2)
+                if (type == 2) {
                         for (i = pos; i < pos + len; i++) {
                                 u8 idx = edid[pos + i] & 0x7f;
                                 svd[svd_n++] = idx;
                                 pr_debug("N%sative mode #%d\n",
                                          edid[pos + i] & 0x80 ? "" : "on-n", idx);
                         }
+                } else if (type == 3 && len >= 3) {
+                        /* Check Vendor Specific Data Block.  For HDMI,
+                           it is always 00-0C-03 for HDMI Licensing, LLC. */
+                        if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
+                            edid[pos + 3] == 0)
+                                specs->misc |= FB_MISC_HDMI;
+                }
                 pos += len + 1;
         }