drm/nv50: fix duallink_possible calculation for DCB 4.0 cards
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index b3c7a87..9f30fb8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -5536,12 +5536,6 @@
entry->bus = (conn >> 16) & 0xf;
entry->location = (conn >> 20) & 0x3;
entry->or = (conn >> 24) & 0xf;
- /*
- * Normal entries consist of a single bit, but dual link has the
- * next most significant bit set too
- */
- entry->duallink_possible =
- ((1 << (ffs(entry->or) - 1)) * 3 == entry->or);
switch (entry->type) {
case OUTPUT_ANALOG:
@@ -5625,6 +5619,16 @@
break;
}
+ if (dcb->version < 0x40) {
+ /* Normal entries consist of a single bit, but dual link has
+ * the next most significant bit set too
+ */
+ entry->duallink_possible =
+ ((1 << (ffs(entry->or) - 1)) * 3 == entry->or);
+ } else {
+ entry->duallink_possible = (entry->sorconf.link == 3);
+ }
+
/* unsure what DCB version introduces this, 3.0? */
if (conf & 0x100000)
entry->i2c_upper_default = true;