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authorLyude Paul <lyude@redhat.com>2019-09-13 18:03:50 -0400
committerBen Skeggs <bskeggs@redhat.com>2019-09-17 14:50:15 +1000
commit698c1aa9f83b618de79e9e5e19a58f70a4a6ae0f (patch)
treedcbc041dcfda7b86042045d2ea34747420dbba7d /drivers
parent9a60b2990d6c2b7ab935fe0a5cc274de67d98bed (diff)
drm/nouveau/kms/nv50-: Don't create MSTMs for eDP connectors
On the ThinkPad P71, we have one eDP connector exposed along with 5 DP connectors, resulting in a total of 11 TMDS encoders. Since the GPU on this system is also capable of MST, we create an additional 4 fake MST encoders for each DP port. Unfortunately, we also do this for the eDP port as well, resulting in: 1 eDP port: +1 TMDS encoder +4 DPMST encoders 5 DP ports: +2 TMDS encoders +4 DPMST encoders *5 ports == 35 encoders Which breaks things, since DRM has a hard coded limit of 32 encoders. So, fix this by not creating MSTMs for any eDP connectors. This brings us down to 31 encoders, although we can do better. This fixes driver probing for nouveau on the ThinkPad P71. Signed-off-by: Lyude Paul <lyude@redhat.com> Cc: stable@vger.kernel.org Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/nouveau/dispnv50/disp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index f1dbc7852414..064a69d161e3 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -1599,7 +1599,8 @@ nv50_sor_create(struct drm_connector *connector, struct dcb_output *dcbe)
nv_encoder->aux = aux;
}
- if ((data = nvbios_dp_table(bios, &ver, &hdr, &cnt, &len)) &&
+ if (nv_connector->type != DCB_CONNECTOR_eDP &&
+ (data = nvbios_dp_table(bios, &ver, &hdr, &cnt, &len)) &&
ver >= 0x40 && (nvbios_rd08(bios, data + 0x08) & 0x04)) {
ret = nv50_mstm_new(nv_encoder, &nv_connector->aux, 16,
nv_connector->base.base.id,