drm/nouveau/bios/dp: use alternate set of drvctl values where necessary

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

drivers/gpu/drm/nouveau/nvkm/subdev/bios/dp.c

@@ -148,7 +148,8 @@ nvbios_dpcfg_entry(struct nvkm_bios *bios, u16 outp, u8 idx,
 		outp = nvbios_dp_table(bios, ver, hdr, cnt, len);
 		*hdr = *hdr + (*len * * cnt);
 		*len = nv_ro08(bios, outp + 0x06);
-		*cnt = nv_ro08(bios, outp + 0x07);
+		*cnt = nv_ro08(bios, outp + 0x07) *
+		       nv_ro08(bios, outp + 0x05);
 	}
 
 	if (idx < *cnt)
@@ -196,12 +197,10 @@ nvbios_dpcfg_match(struct nvkm_bios *bios, u16 outp, u8 pc, u8 vs, u8 pe,
 	u16 data;
 
 	if (*ver >= 0x30) {
-		/*XXX: there's a second set of these on at least 4.1, that
-		 *     i've witnessed nvidia using instead of the first
-		 *     on gm204.  figure out what/why
-		 */
 		const u8 vsoff[] = { 0, 4, 7, 9 };
 		idx = (pc * 10) + vsoff[vs] + pe;
+		if (*ver >= 0x40 && *hdr >= 0x12)
+			idx += nv_ro08(bios, outp + 0x11) * 40;
 	} else {
 		while ((data = nvbios_dpcfg_entry(bios, outp, ++idx,
 						  ver, hdr, cnt, len))) {