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 75a376c..74a3f68 100644 (file)
--- 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) &&