From: Adam Jackson <ajax@redhat.com>
Date: Tue, 3 Aug 2010 18:38:18 +0000 (-0400)
Subject: drm/edid: Add detailed block walk for VTB extensions
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=cbba98f8f651a763fe9fd167efa65cd7b1fa22d9;p=openwrt%2Fstaging%2Fblogic.git

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>
---

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
@@ -711,6 +711,19 @@ cea_for_each_detailed_block(u8 *ext, detailed_cb *cb, void *closure)
 		cb((struct detailed_timing *)(det_base + 18 * i), 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)
 {
@@ -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;
 		}