From: Ben Skeggs <bskeggs@redhat.com>
Date: Fri, 21 Aug 2015 00:52:54 +0000 (+1000)
Subject: drm/nouveau/bios/dcb: accept "maxwell" lane count values for dcb 4.0
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7c11c99b3c66a8e03494e56ce6e6c5303ee85934;p=linux-beck.git

drm/nouveau/bios/dcb: accept "maxwell" lane count values for dcb 4.0

We previously assumed that the values "2" and "4" were new in DCB 4.1,
however, there's at least one GM107 DCB 4.0 board (Quadro K620) that
uses the newer values.

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 0190b69bbe25..e9de6e37af56 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -1481,19 +1481,18 @@ parse_dcb20_entry(struct drm_device *dev, struct dcb_table *dcb,
 			entry->dpconf.link_bw = 540000;
 			break;
 		}
-		entry->dpconf.link_nr = (conf & 0x0f000000) >> 24;
-		if (dcb->version < 0x41) {
-			switch (entry->dpconf.link_nr) {
-			case 0xf:
-				entry->dpconf.link_nr = 4;
-				break;
-			case 0x3:
-				entry->dpconf.link_nr = 2;
-				break;
-			default:
-				entry->dpconf.link_nr = 1;
-				break;
-			}
+		switch ((conf & 0x0f000000) >> 24) {
+		case 0xf:
+		case 0x4:
+			entry->dpconf.link_nr = 4;
+			break;
+		case 0x3:
+		case 0x2:
+			entry->dpconf.link_nr = 2;
+			break;
+		default:
+			entry->dpconf.link_nr = 1;
+			break;
 		}
 		link = entry->dpconf.sor.link;
 		entry->i2c_index += NV_I2C_AUX(0);
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.c
index 8d78140f9401..95e9208e47d1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.c
@@ -156,20 +156,19 @@ dcb_outp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
 					break;
 				}
 
-				outp->dpconf.link_nr = (conf & 0x0f000000) >> 24;
-				if (*ver < 0x41) {
-					switch (outp->dpconf.link_nr) {
-					case 0x0f:
-						outp->dpconf.link_nr = 4;
-						break;
-					case 0x03:
-						outp->dpconf.link_nr = 2;
-						break;
-					case 0x01:
-					default:
-						outp->dpconf.link_nr = 1;
-						break;
-					}
+				switch ((conf & 0x0f000000) >> 24) {
+				case 0xf:
+				case 0x4:
+					outp->dpconf.link_nr = 4;
+					break;
+				case 0x3:
+				case 0x2:
+					outp->dpconf.link_nr = 2;
+					break;
+				case 0x1:
+				default:
+					outp->dpconf.link_nr = 1;
+					break;
 				}
 
 				/* fall-through... */