drm/nouveau: enable enhanced framing only if DP display supports it

Reported-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 89ca1f6..6bf3f71 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -317,7 +317,8 @@ train:
                return false;
 
        config[0] = nv_encoder->dp.link_nr;
-       if (nv_encoder->dp.dpcd_version >= 0x11)
+       if (nv_encoder->dp.dpcd_version >= 0x11 &&
+           nv_encoder->dp.enhanced_frame)
                config[0] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 
        ret = nouveau_dp_lane_count_set(encoder, config[0]);
@@ -468,10 +469,12 @@ nouveau_dp_detect(struct drm_encoder *encoder)
            !nv_encoder->dcb->dpconf.link_bw)
                nv_encoder->dp.link_bw = DP_LINK_BW_1_62;
 
-       nv_encoder->dp.link_nr = dpcd[2] & 0xf;
+       nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT;
        if (nv_encoder->dp.link_nr > nv_encoder->dcb->dpconf.link_nr)
                nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
 
+       nv_encoder->dp.enhanced_frame = (dpcd[2] & DP_ENHANCED_FRAME_CAP);
+
        return true;
 }
 

diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h
index 7c82d68..ae69b61 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_encoder.h
+++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h
@@ -55,6 +55,7 @@ struct nouveau_encoder {
                        int dpcd_version;
                        int link_nr;
                        int link_bw;
+                       bool enhanced_frame;
                } dp;
        };
 };