drm/nouveau: recognise DCB connector type 0x41 as LVDS

After looking at a number of different logs, it appears 0x41 likely
indicates the presense of an LVDS panel following the SPWG spec
(http://www.spwg.org/)

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

3 files changed, 7 insertions, 3 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index 8486dc6ee16c..729d5fd7c88d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -6031,6 +6031,7 @@ parse_dcb_connector_table(struct nvbios *bios)
                 case DCB_CONNECTOR_DVI_I:
                 case DCB_CONNECTOR_DVI_D:
                 case DCB_CONNECTOR_LVDS:
+                case DCB_CONNECTOR_LVDS_SPWG:
                 case DCB_CONNECTOR_DP:
                 case DCB_CONNECTOR_eDP:
                 case DCB_CONNECTOR_HDMI_0:
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.h b/drivers/gpu/drm/nouveau/nouveau_bios.h
index 8a54fa7edf5c..050c314119df 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.h
@@ -82,6 +82,7 @@ enum dcb_connector_type {
         DCB_CONNECTOR_DVI_I = 0x30,
         DCB_CONNECTOR_DVI_D = 0x31,
         DCB_CONNECTOR_LVDS = 0x40,
+        DCB_CONNECTOR_LVDS_SPWG = 0x41,
         DCB_CONNECTOR_DP = 0x46,
         DCB_CONNECTOR_eDP = 0x47,
         DCB_CONNECTOR_HDMI_0 = 0x60,
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 7ae151109a66..1595d0b6e815 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -442,7 +442,7 @@ nouveau_connector_set_property(struct drm_connector *connector,
                 }
 
                 /* LVDS always needs gpu scaling */
-                if (nv_connector->dcb->type == DCB_CONNECTOR_LVDS &&
+                if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS &&
                     value == DRM_MODE_SCALE_NONE)
                         return -EINVAL;
 
@@ -650,6 +650,7 @@ nouveau_connector_get_modes(struct drm_connector *connector)
                 ret = get_slave_funcs(encoder)->get_modes(encoder, connector);
 
         if (nv_connector->dcb->type == DCB_CONNECTOR_LVDS ||
+            nv_connector->dcb->type == DCB_CONNECTOR_LVDS_SPWG ||
             nv_connector->dcb->type == DCB_CONNECTOR_eDP)
                 ret += nouveau_connector_scaler_modes_add(connector);
 
@@ -810,6 +811,7 @@ nouveau_connector_create(struct drm_device *dev, int index)
                 type = DRM_MODE_CONNECTOR_HDMIA;
                 break;
         case DCB_CONNECTOR_LVDS:
+        case DCB_CONNECTOR_LVDS_SPWG:
                 type = DRM_MODE_CONNECTOR_LVDS;
                 funcs = &nouveau_connector_funcs_lvds;
                 break;
@@ -838,7 +840,7 @@ nouveau_connector_create(struct drm_device *dev, int index)
         drm_connector_helper_add(connector, &nouveau_connector_helper_funcs);
 
         /* Check if we need dithering enabled */
-        if (dcb->type == DCB_CONNECTOR_LVDS) {
+        if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
                 bool dummy, is_24bit = false;
 
                 ret = nouveau_bios_parse_lvds_table(dev, 0, &dummy, &is_24bit);
@@ -883,7 +885,7 @@ nouveau_connector_create(struct drm_device *dev, int index)
                                 nv_connector->use_dithering ?
                                 DRM_MODE_DITHERING_ON : DRM_MODE_DITHERING_OFF);
 
-                if (dcb->type != DCB_CONNECTOR_LVDS) {
+                if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS) {
                         if (dev_priv->card_type >= NV_50)
                                 connector->polled = DRM_CONNECTOR_POLL_HPD;
                         else