From: Ben Skeggs <bskeggs@redhat.com>
Date: Mon, 18 Apr 2011 00:49:03 +0000 (+1000)
Subject: drm/nv50: respect LVDS link count from EDID on SPWG panels
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b23b9e7109e74a2cb10705396148624016ad8f8f;p=linux-beck.git

drm/nv50: respect LVDS link count from EDID on SPWG panels

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index 75a376cc342a..74a3f6872701 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -517,13 +517,25 @@ nv50_display_script_select(struct drm_device *dev, struct dcb_entry *dcb,
 			if (bios->fp.if_is_24bit)
 				script |= 0x0200;
 		} else {
+			/* determine number of lvds links */
+			if (nv_connector && nv_connector->edid &&
+			    nv_connector->dcb->type == DCB_CONNECTOR_LVDS_SPWG) {
+				/* http://www.spwg.org */
+				if (((u8 *)nv_connector->edid)[121] == 2)
+					script |= 0x0100;
+			} else
 			if (pxclk >= bios->fp.duallink_transition_clk) {
 				script |= 0x0100;
+			}
+
+			/* determine panel depth */
+			if (script & 0x0100) {
 				if (bios->fp.strapless_is_24bit & 2)
 					script |= 0x0200;
-			} else
-			if (bios->fp.strapless_is_24bit & 1)
-				script |= 0x0200;
+			} else {
+				if (bios->fp.strapless_is_24bit & 1)
+					script |= 0x0200;
+			}
 
 			if (nv_connector && nv_connector->edid &&
 			    (nv_connector->edid->revision >= 4) &&