drm/nouveau/disp: log if DP link training fails

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

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
index 054d9cff4f53..15448b9abac8 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
@@ -308,7 +308,7 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
         while (*link_bw > (dp->dpcd[1] * 27000))
                 link_bw++;
 
-        while (link_bw[0]) {
+        while ((ret = -EIO) && link_bw[0]) {
                 /* find minimum required lane count at this link rate */
                 dp->link_nr = dp->dpcd[2] & DPCD_RC02_MAX_LANE_COUNT;
                 while ((dp->link_nr >> 1) * link_bw[0] > datarate)
@@ -339,6 +339,8 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
 
         /* finish link training */
         dp_set_training_pattern(dp, 0);
+        if (ret < 0)
+                ERR("link training failed\n");
 
         /* execute post-train script from vbios */
         dp_link_train_fini(dp);