drm/edid: Add detailed block walk for VTB extensions

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 30b286ba16c4..1bf81b91b70f 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -712,6 +712,19 @@ cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
 }
 
 static void
+vtb_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
+{
+        unsigned int i, n = min((int)ext[0x02], 6);
+        u8 *det_base = ext + 5;
+
+        if (ext[0x01] != 1)
+                return; /* unknown version */
+
+        for (i = 0; i < n; i++)
+                cb((struct detailed_timing *)(det_base + 18 * i), closure);
+}
+
+static void
 drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
 {
         int i;
@@ -729,6 +742,9 @@ drm_for_each_detailed_block(u8 *raw_edid, detailed_cb *cb, void *closure)
                 case CEA_EXT:
                         cea_for_each_detailed_block(ext, cb, closure);
                         break;
+                case VTB_EXT:
+                        vtb_for_each_detailed_block(ext, cb, closure);
+                        break;
                 default:
                         break;
                 }